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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。
Cognitive relay network, the transmission throughput and transmission distance has been an important measure of performance indicators. Most of existing researches focus on the optimization of two-hop networks, but there are also shortcomings such as short transmission distance and single transmission. This paper presents a new triple-hop network transmission scheme using cognitive relay. Through the three-phase transmission process, two-way transmission between secondary users is achieved. At the same time, we introduce the overlay coding technology to deal with the double receiving nodes in the network. In this paper, the three-phase joint optimization problem is transformed into a nonlinear optimization problem and solved. The simulation results show that the proposed optimization method can prolong the transmission distance of the primary user without increasing the number of relay hops, and at the same time improve the secondary user’s transmission throughput.