tw4ld6 发表于 2024-8-31 05:40:41

一种5G网络协同通信自适应中继选取办法


    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;">摘&nbsp; 要</strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">针对协作通信网的中继<span style="color: black;">选取</span>问题,提出了一种基于贝叶斯推理的自适应中继<span style="color: black;">选取</span><span style="color: black;">方法</span>。该<span style="color: black;">方法</span>拓展地运用了放大转发协议的原理,准确地分析了中继节点后验概率,并以此<span style="color: black;">选择</span>最优的中继节点进行信息传输。实验仿真结果<span style="color: black;">显示</span>,该<span style="color: black;">方法</span>在信噪比恒定的<span style="color: black;">状况</span>下,<span style="color: black;">明显</span>地<span style="color: black;">加强</span>了网络性能。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;">&nbsp; &nbsp; 引&nbsp; 言&nbsp; &nbsp; &nbsp;</strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">协作通信因其在终端节点之间能<span style="color: black;">供给</span>协作的潜在应用而受到广泛关注。<span style="color: black;">另外</span>,<span style="color: black;">因为</span>数据应用的大幅增长,频谱资源<span style="color: black;">显现</span>了短缺问题。为<span style="color: black;">认识</span>决这个问题,需要协作通信<span style="color: black;">经过</span>节点间的协作,有效地利用资源,以<span style="color: black;">加强</span>信道的容量[1]。协作通信<span style="color: black;">显示</span>,多用户状态下的单天线<span style="color: black;">能够</span>共享,<span style="color: black;">形成</span>虚拟的多天线发射机,使其能够完成发射分集功能[2]。在基于中继的通信系统中,<span style="color: black;">怎样</span>有效地<span style="color: black;">运用</span>中继节点以及<span style="color: black;">怎样</span>使系统性能最大化是一个非常<span style="color: black;">拥有</span>挑战性的问题。对此,学术界和<span style="color: black;">科研</span>人员提出了<span style="color: black;">区别</span>的技术<span style="color: black;">方法</span>来优化网络性能。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">基于概率的中继<span style="color: black;">选取</span><span style="color: black;">方法</span><span style="color: black;">指的是</span>利用贝叶斯理论计算<span style="color: black;">选取</span>中继节点的概率。该<span style="color: black;">方法</span>将<span style="color: black;">达到</span>的数据速率量化为<span style="color: black;">选取</span>中继节点的先验概率和后验概率,<span style="color: black;">从而</span>最大化网络的数据速率[3]。虽然多输入多输出(MIMO)技术<span style="color: black;">已然</span>能够<span style="color: black;">加强</span>容量和频谱效率(Spectrum<span style="color: black;">Efficiency,SE)</span>[4]<span style="color: black;">,但发射端和接收端天线的倍频需要<span style="color: black;">更加多</span>的电路能量。为了克服这种现象,文献</span>[5]<span style="color: black;"><span style="color: black;">按照</span>信道状态信息(Channel State Information,CSI)提出了一种基于功率<span style="color: black;">掌控</span>门限的中继<span style="color: black;">选取</span><span style="color: black;">方法</span>。文献</span>[6]<span style="color: black;">在蚁群算法的<span style="color: black;">基本</span>上,提出了一种基于功率分配和蚁群优化的中继<span style="color: black;">选取</span>(RS-PA-PSACO)<span style="color: black;">方法</span>。该<span style="color: black;">方法</span><span style="color: black;">能够</span>在总功率固定的<span style="color: black;">状况</span>下,能<span style="color: black;">同期</span><span style="color: black;">得到</span>最小化误比特率(SER)的中继<span style="color: black;">选取</span>和功率分配的最优解。<span style="color: black;">另外</span>,CSI<span style="color: black;">做为</span>中继节点位置<span style="color: black;">选取</span>的参考标准,<span style="color: black;">能够</span><span style="color: black;">经过</span><span style="color: black;">调节</span>所选中继的发射功率来最大化信噪比,从而<span style="color: black;">明显</span><span style="color: black;">加强</span>信噪比,降低误比特率</span>[7]<span style="color: black;">。与基于平均功率的分配<span style="color: black;">方法</span></span>[8]<span style="color: black;">相比,该<span style="color: black;">方法</span><span style="color: black;">加强</span>了接收信噪比,降低了误比特率。为了<span style="color: black;">加强</span>协作网络的能量效率,文献</span>[9]<span style="color: black;">提出了一种基于竞争的<span style="color: black;">选取</span><span style="color: black;">方法</span>。该<span style="color: black;">方法</span>的信源将以最小的发射功率发送数据,中继<span style="color: black;">亦</span>可能消耗最小的能量,这能<span style="color: black;">必定</span>程度上<span style="color: black;">加强</span><span style="color: black;">全部</span>网络的能量效率。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">另外</span>,文献[10]提出了一种基于门限的中继<span style="color: black;">选取</span><span style="color: black;">方法</span>,该<span style="color: black;">方法</span>结合了确定性中继和概率中继的优点,<span style="color: black;">能够</span><span style="color: black;">选取</span>任意的数量<span style="color: black;">做为</span>中继。文献[11]提出在<span style="color: black;">部署</span>固定的中继节点时,<span style="color: black;">能够</span>充分<span style="color: black;">思虑</span>路径损耗以进一步<span style="color: black;">加强</span>无线网络的能量效率。文献[12]<span style="color: black;">科研</span>了所选中继<span style="color: black;">拥有</span>实质性的端到端的中继路径,它实现了最优的性能,并<span style="color: black;">保证</span>完全分集数量等于中继的数量。文献[13]从中继节点<span style="color: black;">选取</span>和功率分配2个方面进行了讨论,在有效利用带宽的<span style="color: black;">同期</span>最小化网络的总功率。文献[14]采用解码转发(Decode-and-Forward,DF)协议对源节点和中继节点进行协作通信功率分配,以优化功率消耗,<span style="color: black;">同期</span>保持服务质量。文献[15]<span style="color: black;">科研</span>了一种分散的中继<span style="color: black;">选取</span><span style="color: black;">方法</span>,即一个客户端<span style="color: black;">按照</span>瞬时信道估计从众多中继中<span style="color: black;">选取</span>端到端的最佳路由。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">针对以上各<span style="color: black;">办法</span>所存在的不足,本文<span style="color: black;">首要</span>对多跳蜂窝网络中的协作通信进行了系统建模,<span style="color: black;">而后</span>提出了一种基于贝叶斯推理的中继<span style="color: black;">选取</span><span style="color: black;">方法</span>,最后<span style="color: black;">经过</span>仿真实验证明了<span style="color: black;">方法</span>的可行性。</p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOmhl4hq3cGeEHtFy6o1vBAvJp9Zasibh3KyibB0A2dUZibbSNzaKWUYew8A/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><strong style="color: blue;">&nbsp; &nbsp;0 1&nbsp; &nbsp;</strong></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;">系统模型</span></strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">蜂窝网络中协作通信的系统模型如图1所示。该模型由源(S)、中继(R)和信宿(D)<span style="color: black;">形成</span>,其中信源<span style="color: black;">能够</span>是基站或带包等待传输的用户,而中继在发送端和目的端都被认为是用户设备(UE)。</p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOmGBTbicU4b5W1umAhTXJp1KlKe9X2QJojUibNVHibNlib0iaZtMHxfHe7Zng/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;">图1 蜂窝网络中的协作通信</strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">图1中的通信<span style="color: black;">能够</span><span style="color: black;">经过</span>直接路径或中继的<span style="color: black;">帮助</span>2种路径进行,<span style="color: black;">或</span>两者兼而有之。<span style="color: black;">经过</span>直接路径通信时,其接收信号<span style="color: black;">能够</span>描述为:</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">YSD = hSDx + NSD</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&nbsp; (1)</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">式中:</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">hSD&nbsp;——信源到信宿的信道状态信息</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">x&nbsp;——发射信号</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">NSD&nbsp;——信源到信宿的信道噪声</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">当<span style="color: black;">经过</span>中继进行通信时,其过程可分为2个<span style="color: black;">周期</span>进行。在第1<span style="color: black;">周期</span>,信号从信源发送到中继,在中继处接收的信号YSR可描述为:</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&nbsp; &nbsp; YSR = hSRx + NSR</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&nbsp;(2)</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">式中:</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">hSR ——信源到中继的信道状态信息</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">x ——发射信号</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">NSR&nbsp;——信源到中继的信道噪声</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">在第2个<span style="color: black;">周期</span>,信号<span style="color: black;">经过</span>AF协议从中继发送到信宿,信宿接收到的信号YRD可描述为:</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">YRD=αhRDYSR+NRD</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&nbsp; (3)</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">式中:</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">hRD&nbsp;——中继到信宿的信道状态信息</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">α ——传播系数</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">YSR&nbsp;——中继接收到的信号</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">NRD&nbsp;——中继到目的端的信道噪声</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">由文献可知,放大转发(AF)场景下,中继路径(S到R再到D)和直接路径(S到D)上的信噪比<span style="color: black;">能够</span>描述为:</p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOm5zopLrywmGR2cpyQeKyOfRNz3ibB3HkHKbyGmMyPDicQ2LvDQ9JCa89g/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&nbsp; (4)</p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOmaM655xCBAvwtbo3ZoAalR07XxKTSxJznajDJVE82H8sCtehedeq8uw/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&nbsp; (5)</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">式中:</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">g ——放大增益</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">∂1、∂2、∂d&nbsp;——S到R、R到D、S到D的信道状态信息</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">N1、N2&nbsp;——中继接收机噪声和目的接收机噪声</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">中继路径和直接路径上的协作增益(CG )<span style="color: black;">能够</span><span style="color: black;">暗示</span>为:</p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOmLbs3zbDicuz0ploIKze9LqUic45NP5xx05KXCibfod5ofvcHRlvicpsFjQ/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&nbsp; (6)</p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOm39BSOjYf8mib6OWyQ1IxXpmqraAicb9aBsd94Xoa0PCmWCmxIXYFhFtQ/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&nbsp; (7)</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">式中:</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">ε0和ε1 ——<span style="color: black;">经过</span>直接路径和中继路径传输的比特数误差</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">β0&nbsp;——信源发送的总比特数</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">中继路径和直接路径上的信道增益(CHG)可<span style="color: black;">暗示</span>为:</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">CHGSR&amp;RD=abs{min}</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">(8)</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">CHGSD=abs{min}</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&nbsp; (9)</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">式中:</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">α1、α2、αd&nbsp;——S到R、R到D、S到D的传播系数</p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOmhl4hq3cGeEHtFy6o1vBAvJp9Zasibh3KyibB0A2dUZibbSNzaKWUYew8A/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><strong style="color: blue;">&nbsp; &nbsp;0 2&nbsp; &nbsp;</strong></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;">贝叶斯决策与中继<span style="color: black;">选取</span><span style="color: black;">方法</span></span></strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">贝叶斯决策理论是<span style="color: black;">处理</span><span style="color: black;">归类</span>问题的一种基本统计<span style="color: black;">办法</span>。从本质上讲,该<span style="color: black;">办法</span><span style="color: black;">便是</span>利用已知的不完全状态信息,对未知状态进行主观概率估计。基于贝叶斯<span style="color: black;">设备</span>学习算法的朴素贝叶斯<span style="color: black;">归类</span>器被广泛应用于电信数据挖掘、移动通信等<span style="color: black;">行业</span>。在本节中,<span style="color: black;">首要</span>讨论贝叶斯规则的制定,接下来在贝叶斯理论的<span style="color: black;">基本</span>上,<span style="color: black;">处理</span>最优中继选择问题。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">2.1&nbsp; 贝叶斯理论</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">贝叶斯理论是一种利用统计学来描述问题的<span style="color: black;">办法</span>,即从2个已知概率(即先验概率和<span style="color: black;">要求</span>概率)推导出问题的后验概率。先验概率<span style="color: black;">表示</span>了当前收集到的关于问题证据的估计,以P(Sn)来<span style="color: black;">暗示</span>源节点的先验概率。而<span style="color: black;">要求</span>概率是<span style="color: black;">按照</span>观察到的证据对某个未知变量X<span style="color: black;">出现</span>的估计,本文以P(X|Sn)来<span style="color: black;">暗示</span>源节点Sn<span style="color: black;">选取</span>中继节点X的概率。当先验概率和<span style="color: black;">要求</span>概率都已知时,N个中继节点的后验概率<span style="color: black;">能够</span>描述为:</p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOmxrEWyW0nSW3WK9ly2iakibK9bHsibSVs7kULRpEoSj9wDnRYPsy8G6QmA/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&nbsp; (10)</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">其中:</span></p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOmLL5xV5oBnksxF4uPpbgY4ibib2nZ9UibjHhJia2JhJ1H5bfI4RibSIgEia5Q/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&nbsp; (11)</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">2.2&nbsp; 基于贝叶斯理论的自适应中继<span style="color: black;">选取</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">针对协作通信中的最佳中继<span style="color: black;">选取</span>问题,本文提出了一种基于贝叶斯推理的自适应<span style="color: black;">处理</span><span style="color: black;">方法</span>。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">已知直接路径和中继路径的SNR、CG、CHG,则源节点Sn的先验概率为:</p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOmYmjJOzjSMFw4CGuABoswaROqm7M2ezyEkFpvR0dzibVJCL4qfU7jNKg/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&nbsp; (12)</p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOmIIJPxtcZX7dZmte5BPmDUJ0KHNZSrJibWrw99C4dbJHTGVrZgPeK1xQ/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&nbsp; (13)</p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOmxlej8icSYJmx6zJW7Q247fBJsOJXJa9k5xYO9Cy8NZ69tENKJdXpia2w/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&nbsp; (14)</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">其中,Ns为源的个数。中继节点Rm的<span style="color: black;">要求</span>概率为:</p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOmZV5B0k0pXRGAsemVxn278icVz7Do8eeiciacjmiaCKXxaxXsLbPkClXHaw/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&nbsp; (15)</p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOmEBHcNLNKib8qPN57ujsHKl6lURPhnctmibH0vdkEHHFqvdojWsN9JMRg/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&nbsp; (16)</p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOm7YNLFnLS4RJMNs66ZuLD0Y9ib7pnJuFTaRyxAvIAaA8oAzRfTERzKZQ/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&nbsp; (17)</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">其中,Nr<span style="color: black;">暗示</span>可用的中继节点总数。<span style="color: black;">按照</span>贝叶斯准则,后验概率可描述为:</p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOmzKuEft0ffp2ibKRP6vX0GaUS21JEfzBry9f2rQzPhdmqw1veqA3pVXg/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&nbsp; (18)</p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOmHlkfSy5kZbm1jrA50Zbpt2PX8e06WmCgCd3JVZ1DaWG7tPHPYwVWdg/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&nbsp; (19)</p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOmHXWgtkiaDaLUdULke20YKibvB40tn9tw28IY0xMncBTxK2Jxaeia8L4CA/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&nbsp; (20)</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">在计算所有<span style="color: black;">原因</span>的后验概率后,源节点Sn所<span style="color: black;">选取</span>的中继节点为:</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">Rm=argmaxs.t. 0≤m≤ Nr</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&nbsp; (21)</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">按照</span>式(21),<span style="color: black;">针对</span>源节点Sn,<span style="color: black;">选取</span>综合后验概率最大的中继节点Rm进行通信,以<span style="color: black;">提高</span>系统性能。</p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOmhl4hq3cGeEHtFy6o1vBAvJp9Zasibh3KyibB0A2dUZibbSNzaKWUYew8A/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><strong style="color: blue;">&nbsp; &nbsp;0 3&nbsp; &nbsp;</strong></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;">实验与分析</span></strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">3.1&nbsp; 仿真环境</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">这次</span>实验在MATLAB 2017a软件<span style="color: black;">研发</span>平台上进行,并<span style="color: black;">创立</span>了如图2所示协作通信模型。定义了2个源S1和S2,并<span style="color: black;">供给</span>2个中继节点R1和R2。源端<span style="color: black;">能够</span><span style="color: black;">选取</span>这些中继节点中的任意一个与目的端进行通信,<span style="color: black;">亦</span><span style="color: black;">能够</span>直接与目的端进行通信。从图2中<span style="color: black;">能够</span>看出,2个源都有3条可用路径进行传输,第1个是直接路径,即S1D和S2D,第2个是中继路径,即S1R1、S1R2、S2R1和S2R2。</p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOmbaiaCb09SQ0cX2nibblnoKOMhiaIhfbTKkLiavBDoldscW4jdxaAo8Zib9g/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;">图2 协作通信仿真模型</span></strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">运用</span>瑞利衰落信道调用AF中继协议。信号从信源出发,<span style="color: black;">经过</span>中继或直接到达信宿的信噪比、协同增益、信道增益分别如表1~表3所示。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">表1 直接路径和中继路径上的信噪比</span></p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOmdFIlkeFZAMbKAia4Vcv9EQsu7LKeJib0ZoXvUSKvdQLUz4KT48vca0Fg/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">表2 直接路径和中继路径上的协同增益</p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOmuX68ACYhBEpVABXFuX3a0LI1fkeAfqCndUc4r3zhZ1rWvbZPEkVYQg/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">表3 直接路径和中继路径上的信道增益</span></p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOm8icDmc00Ftnw6UMlavVEJSNhYeAvnBiaic9VV0sFAiclyZib1HO0cyWTt1g/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">当直接路径和中继路径上的SNR、CG和CHG已知时,<span style="color: black;">按照</span>式(12)、式(13)和式(14)<span style="color: black;">能够</span>计算出<span style="color: black;">每一个</span>信源的先验概率,<span style="color: black;">按照</span>式(15)、式(16)和式(17)<span style="color: black;">能够</span>计算出<span style="color: black;">每一个</span>中继节点的<span style="color: black;">要求</span>概率,<span style="color: black;">详细</span>结果如表4~表6所示。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">表4 由SNR计算出的先验概率和<span style="color: black;">要求</span>概率</span></p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOmaic5nMLjPRhcHVQfymc7dwBOZthSRiawQd3nqImmo3MO5tqEQ4DFibEFQ/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">表5 由CG计算出的先验概率和<span style="color: black;">要求</span>概率</span></p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOmmgTicXy6dlR9W12E6w4cUGEAYnnUOYqIQ1dCTvDlp6NjXicrk2Ts9mcQ/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">表6 由CHG计算出的先验概率和<span style="color: black;">要求</span>概率</p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOmg1LFibLrwKibqvDlhIKiasMqYVNM0900os0bBHz7JMd91VoqEibDsfiae1Q/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">3.2&nbsp; 实验结果</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">仿真<span style="color: black;">思虑</span>了4条中继路径和2条直接路径,使得<span style="color: black;">每一个</span>源节点<span style="color: black;">能够</span><span style="color: black;">得到</span>2条中继路径和1条直接路径。<span style="color: black;">运用</span>二进制相移键控(BPSK)调制发送了104个符号。在接收端采用直接路径接收信号,并<span style="color: black;">经过</span>选定的中继进行最大比合并(MRC),将所有6条路径的结果组合起来进行比较,仿真结果如图3所示。</p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOmfBFgRsCTUZBVczwTqZHNUOCNwkvicAl7ys4ibBdMoU8lfZmKPQtP1P9A/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;">图3 系统中各传输路径的性能分析</span></strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">从图3<span style="color: black;">能够</span>看出,源S1<span style="color: black;">选取</span>的中继R1与源S1拒绝R2相比,降低了误比特率,源S2<span style="color: black;">选取</span>的中继R2与源S2拒绝的中继R1相比,降低了误比特率,中继路径的误比特率<span style="color: black;">亦</span>优于直接路径。结果<span style="color: black;">显示</span>,本文提出的算法<span style="color: black;">加强</span>了中继节点的决策能力,降低了误比特率,<span style="color: black;">经过</span><span style="color: black;">选取</span>更好的中继节点,实现了<span style="color: black;">有效</span><span style="color: black;">靠谱</span>的通信。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">3.3&nbsp; 与其他算法的比较</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">为进一步分析中继<span style="color: black;">选取</span>算法对通信系统性能的影响,将所提出的算法与随机<span style="color: black;">选取</span>中继<span style="color: black;">办法</span>和所有中继循环转发<span style="color: black;">办法</span>进行了对比,结果如图4所示。</p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/rmgntykSUhI50VLmz5G67c0MxtoP0GOmEK8R4wKIcsSO4OZB2ARFJibp2TlaN861QYRTrCcf82tGYhKvibGNFSVQ/640?wx_fmt=png&amp;from=appmsg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;">图4 各<span style="color: black;">方法</span>的系统性能比较</span></strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">从图4<span style="color: black;">能够</span>看出,随着信噪比的增大,误比特率呈现下降趋势,且本文提出的中继<span style="color: black;">选取</span>算法的误比特率要优于<span style="color: black;">另一</span>2种经典的中继<span style="color: black;">选取</span>算法。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">结合图3和图4<span style="color: black;">能够</span>看出,本文所提算法有效降低了通信的误比特率,<span style="color: black;">加强</span>了通信质量。这是<span style="color: black;">因为</span>本文所提算法能<span style="color: black;">按照</span>中继节点的状态信息和信道信息,自适应地<span style="color: black;">选取</span>通信路径,<span style="color: black;">加强</span>了通信系统在中继节点和信道环境变差等<span style="color: black;">状况</span>下的容错性,而随机中继<span style="color: black;">选取</span>算法仅仅是对所需要的中继节点进行随机<span style="color: black;">归类</span>和<span style="color: black;">选取</span>,<span style="color: black;">无</span>对信息的收发环境进行分析,故通信网络的性能<span style="color: black;">不足</span>稳定。</p><img src="data:image/svg+xml,%3C%3Fxml version=1.0 encoding=UTF-8%3F%3E%3Csvg width=1px height=1px viewBox=0 0 1 1 version=1.1 xmlns=http://www.w3.org/2000/svg xmlns:xlink=http://www.w3.org/1999/xlink%3E%3Ctitle%3E%3C/title%3E%3Cg stroke=none stroke-width=1 fill=none fill-rule=evenodd fill-opacity=0%3E%3Cg transform=translate(-249.000000, -126.000000) fill=%23FFFFFF%3E%3Crect x=249 y=126 width=1 height=1%3E%3C/rect%3E%3C/g%3E%3C/g%3E%3C/svg%3E" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><strong style="color: blue;">0 4</strong></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;">&nbsp;总&nbsp; 结</span></strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">本文提出了一种自适应的中继<span style="color: black;">选取</span><span style="color: black;">方法</span>,该<span style="color: black;">方法</span><span style="color: black;">按照</span>后验概率自适应地<span style="color: black;">选取</span>可用的中继节点进行协作。在蜂窝网络的协作通信中,中继是有效地<span style="color: black;">选取</span>用户设备的关键,<span style="color: black;">按照</span><span style="color: black;">区别</span>的信道<span style="color: black;">要求</span>进行中继<span style="color: black;">选取</span>是最关键的。<span style="color: black;">因此呢</span>,本文的<span style="color: black;">目的</span>是有效地<span style="color: black;">运用</span>中继节点,以<span style="color: black;">增多</span>网络的<span style="color: black;">靠谱</span>性,从而<span style="color: black;">经过</span>减少错误来改善接收信号的质量。将SNR、CG、CHG 3种信道<span style="color: black;">要求</span><span style="color: black;">做为</span>先验概率,计算后验概率,<span style="color: black;">选取</span>到达目的节点的最佳可用中继。最后,本文给出了所提算法的仿真结果,并与2种<span style="color: black;">平常</span>的中继<span style="color: black;">选取</span>算法进行了对比,从而验证了本文所提算法的有效性。</span></p><img src="data:image/svg+xml,%3C%3Fxml version=1.0 encoding=UTF-8%3F%3E%3Csvg width=1px height=1px viewBox=0 0 1 1 version=1.1 xmlns=http://www.w3.org/2000/svg xmlns:xlink=http://www.w3.org/1999/xlink%3E%3Ctitle%3E%3C/title%3E%3Cg stroke=none stroke-width=1 fill=none fill-rule=evenodd fill-opacity=0%3E%3Cg transform=translate(-249.000000, -126.000000) fill=%23FFFFFF%3E%3Crect x=249 y=126 width=1 height=1%3E%3C/rect%3E%3C/g%3E%3C/g%3E%3C/svg%3E" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">参</p>

    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">考</p>

    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">文</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">献</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">[1]张语昕.移动通信网络中的协作通信[J]. 通信电源技术,2020,37(7):225-7.</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">[2]肖海林,左清念,朱丹,等.基于D2D的C-V2V车载协作通信资源分配算法[J].电子科技大学学报,2021,50(5):689-696.</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">[3]亓凯梁,刘超,包建荣 . 多中继<span style="color: black;">选取</span>极化译码转发及优化功率分配[J].电子学报,2022,50(5):1167-73.</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">[4]张宇策,张果,陈佳丽 . Massive MIMO 中的波束算法及<span style="color: black;">方法</span><span style="color: black;">科研</span>[J].邮电设计技术,2021,(8):43-50.</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">[5]XU J,NIU H,ZHAO T,et al. Robust Optimal Power Control and Subcarrier Allocation in Uplink OFDMA Network With Assistance of Mobile Relay[J].IEEE access,2021(9):57475-85.</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">[6]SHARMA A S,KIM D S. Energy efficient multipath ant colony based routing algorithm for mobile ad hoc networks[J]. Ad Hoc Networks,2021(113):102396.</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">[7]WAQAS S A,JAWAD M,KHAN I,et al. Path(s)Finding and Selection Technique for Multi-Hop Mesh Cooperative Networks[J].2013,6(1):50.</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">[8]LI Y,LIAO C,WANG Y,et al. Energy-efficient optimal relay selection in cooperative cellular networks based on double auction[J].IEEE Transactions on Wireless Communications,2015,14(8):4093-104.</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">[9]蒋华,王瑶,王慧娇,等 .基于模糊<span style="color: black;">规律</span>的 WSNs能量<span style="color: black;">有效</span>分簇路由算法[J].微电子学与计算机,2020,37(7):25-30.</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">[10]EL-ZAHR S,ABOU-RJEILY C. Threshold based relay selection for buffer-aided cooperative relaying systems[J]. IEEE Transactions on Wireless Communications,2021,20(9):6210-6223.</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">[11]任静,姚远程,秦明伟,等. 一种<span style="color: black;">繁杂</span>环境下的无线应急通信中继节点快速布点<span style="color: black;">办法</span>[J].宇航计测技术,2022,42(1):45-50.</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">[12]ZARIN N,MAHMUD S A,KHAN I. Relay based cooperative spectrum sensing in cognitive radio networks over rayleigh fading channel with path loss effects[C]//proceedings of the 2012 15th International Multitopic Conference(INMIC).2012.</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">[13]NING Q,YANG T,CHEN B,et al. Cooperative Transmission of Wireless Information and Energy in Anti-Eavesdropping UAV Relay Network[J].IEEE Transactions on Green Communications,2021,5(3):1283-1292.</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">[14]WANG X,ZHANG P,SHU F,et al. Power Allocation for IRS-aided Two-way Decode-and-Forward Relay Wireless Network[J].IEEE Transactions on Vehicular Technology,2022:1-6.</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">[15]CHEN G,TIAN Z,GONG Y,et al. Max-ratio relay selection in secure buffer-aided cooperative wireless networks[J].IEEE Transactions on Information Forensics &amp; Security, 2014,9(4):719-729.</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">[16]DAN C,HONG J,XI L,et al. Optimal joint relay selection and resource allocation with QoS constraints in multiuser OFDM-based cellular networks[J]. High Technology Letters,2021,17(3):305-310.</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">[17]张云飞. 基于贝叶斯决策的无人机飞行路径自动规划<span style="color: black;">办法</span>[J].计算机<span style="color: black;">测绘</span>与<span style="color: black;">掌控</span>,2021,29(11):196-200.</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;">作者简介</strong></p><img src="data:image/svg+xml,%3C%3Fxml version=1.0 encoding=UTF-8%3F%3E%3Csvg width=1px height=1px viewBox=0 0 1 1 version=1.1 xmlns=http://www.w3.org/2000/svg xmlns:xlink=http://www.w3.org/1999/xlink%3E%3Ctitle%3E%3C/title%3E%3Cg stroke=none stroke-width=1 fill=none fill-rule=evenodd fill-opacity=0%3E%3Cg transform=translate(-249.000000, -126.000000) fill=%23FFFFFF%3E%3Crect x=249 y=126 width=1 height=1%3E%3C/rect%3E%3C/g%3E%3C/g%3E%3C/svg%3E" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">孙磊,工程师,学士,<span style="color: black;">重点</span>从事移动增值业务<span style="color: black;">关联</span>咨询设计工作;</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">丁茂,工程师,学士,<span style="color: black;">重点</span>从事移动增值业务<span style="color: black;">关联</span>咨询设计工作;</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">尹以雁,工程师,学士,<span style="color: black;">重点</span>从事移动增值业务<span style="color: black;">关联</span>咨询设计工作;</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">幸锋,工程师,学士,<span style="color: black;">重点</span>从事移动增值业务<span style="color: black;">关联</span>咨询设计工作;</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">李治文,工程师,学士,<span style="color: black;">重点</span>从事移动增值业务<span style="color: black;">关联</span>咨询设计工作;</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">张婧,工程师,学士,<span style="color: black;">重点</span>从事移动增值业务<span style="color: black;">关联</span>咨询设计工作;</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">郭建军,硕士,<span style="color: black;">重点</span><span style="color: black;">科研</span>方向为视觉定位、<span style="color: black;">设备</span>学习;</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">刘芫健,教授,博士,<span style="color: black;">重点</span><span style="color: black;">科研</span>方向为下一代无线通信系统网络规划与优化、射线跟踪<span style="color: black;">办法</span>及其工程应用、室内短距离电波传播等。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;">举荐</span>阅读</strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><a style="color: black;">数字化技术在5G基站电磁辐射监测中的应用</a></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><a style="color: black;">基于共建共享模式的高铁隧道5G/4G覆盖策略</a></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><a style="color: black;">无线切片能力验证及应用探讨</a></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><a style="color: black;">基于应用识别和感知优化的5G服务质量<span style="color: black;">保证</span><span style="color: black;">方法</span><span style="color: black;">科研</span></a></p><img src="data:image/svg+xml,%3C%3Fxml version=1.0 encoding=UTF-8%3F%3E%3Csvg width=1px height=1px viewBox=0 0 1 1 version=1.1 xmlns=http://www.w3.org/2000/svg xmlns:xlink=http://www.w3.org/1999/xlink%3E%3Ctitle%3E%3C/title%3E%3Cg stroke=none stroke-width=1 fill=none fill-rule=evenodd fill-opacity=0%3E%3Cg transform=translate(-249.000000, -126.000000) fill=%23FFFFFF%3E%3Crect x=249 y=126 width=1 height=1%3E%3C/rect%3E%3C/g%3E%3C/g%3E%3C/svg%3E" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">点击“阅读原文”,下载论文PDF</p><img src="data:image/svg+xml,%3C%3Fxml version=1.0 encoding=UTF-8%3F%3E%3Csvg width=1px height=1px viewBox=0 0 1 1 version=1.1 xmlns=http://www.w3.org/2000/svg xmlns:xlink=http://www.w3.org/1999/xlink%3E%3Ctitle%3E%3C/title%3E%3Cg stroke=none stroke-width=1 fill=none fill-rule=evenodd fill-opacity=0%3E%3Cg transform=translate(-249.000000, -126.000000) fill=%23FFFFFF%3E%3Crect x=249 y=126 width=1 height=1%3E%3C/rect%3E%3C/g%3E%3C/g%3E%3C/svg%3E" style="width: 50%; margin-bottom: 20px;"><img src="data:image/svg+xml,%3C%3Fxml version=1.0 encoding=UTF-8%3F%3E%3Csvg width=1px height=1px viewBox=0 0 1 1 version=1.1 xmlns=http://www.w3.org/2000/svg xmlns:xlink=http://www.w3.org/1999/xlink%3E%3Ctitle%3E%3C/title%3E%3Cg stroke=none stroke-width=1 fill=none fill-rule=evenodd fill-opacity=0%3E%3Cg transform=translate(-249.000000, -126.000000) fill=%23FFFFFF%3E%3Crect x=249 y=126 width=1 height=1%3E%3C/rect%3E%3C/g%3E%3C/g%3E%3C/svg%3E" style="width: 50%; margin-bottom: 20px;">
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;">欢迎扫码关注</strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;">头条号|</strong>邮电设计技术</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;">官方网站|</strong>http://ydsjjs.paperopen.com</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">编辑|李星初&nbsp; 审核:姜火明</p>




1fy07h 发表于 2024-10-30 10:29:35

外贸B2B平台有哪些?
页: [1]
查看完整版本: 一种5G网络协同通信自适应中继选取办法