认知中继三跳网络联合优化

Abstract

认知中继网络中，传输的吞吐量和传输距离一直是衡量性能的重要指标。现有的研究多数都集中在两跳网络的优化，但其也存在着传输距离不长，只能进行单项传输等缺点。本文提出了一种新的使用认知中继的三跳网络传输方案，通过三阶段的传输过程，实现了次级用户之间的双向传输。同时，引入了叠加编码技术来处理网络中双接收节点的情况。本文将这个三阶段的联合优化问题转化为一个非线性的优化问题，并进行了求解。仿真结果表明，本文提出的优化方法可以在不增加中继跳数的情况下，延长主用户传输距离，并同时提高次级用户的传输吞吐量。

Keywords

解码转发 / 三跳 / 认知中继网络 / 时间功率分配 / 叠加编码

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RIGHTS & PERMISSIONS

Zhejiang University and Springer-Verlag Berlin Heidelberg