功率分裂的无线信息与能量同传中继方案的优化

研究了无线信息与能量同时传输两跳协作中继系统中的传输方案优化问题.方案中,第1跳中继节点对接收到的源节点发送的信号进行功率分裂,一部分信号用于信息的译码;另一部分转换成能量用于第2跳的信息转发.中继采用译码转发协议,与常规方案不同,所提方案两跳采用不等时长方式,在传输总信息量一定的情况下,以两跳总传输时间最小化为目标,对功率分裂因子进行优化求解.由于无法直接完全通过解析求解获得优化结果,故采用部分解析求解和遍历搜索求解相结合的方法求解优化问题.仿真结果表明,在无线信息与能量同时传输中继模型下,所提方案的传输速率和系统吞吐量明显优于传统的两跳等时长的译码转发和放大转发方案.

Power splitting scheme optimization for SWIPT relaying systems

This paper studies the transmission scheme optimizing problem of two-hop cooperative relaying networks with simultaneous wireless information and power transfer. In the scheme, decode-and-forward relaying protocol is employed. The signal transmitted from source is divided into two parts at the relay node. One part is used for information decode between the source and the relay, while the other is used for energy harvesting and the harvested energy is used for the second hop information forwarding. Different from the conventional schemes, the durations of the two hops in this proposed scheme are unequal. In order to minimize the total transmission time of a relay period, the power splitting factor optimizing problem is analyzed. The final optimal result can not be obtained directly through analytical algorithm, so the optimizing problem is solved through deriving partial analytical solution and ergodic searching solution. Simulation results show that, in the simultaneous wireless information and power transfer relaying model, the proposed optimal scheme outperforms the decode-and-forward scheme or amplify and forward scheme in which the durations of the two hops are equal.