基于能量收集的多信源编码协作系统性能研究

Performance of multi-source coded cooperative system based on energy harvesting

为突破中继节点能量受限问题,文中研究了基于能量收集的多信源编码协作系统。首先,针对两信源单中继编码协作系统,基于能量收集技术配置多天线的中继节点同时实现能量收集与信息译码,并采用注水算法将收集到的能量分配到多天线,分析得出系统中断概率表达式。理论分析和仿真结果表明,采用该算法能获得更优异的中断概率性能。同时,随着能量转换效率的上升或中继节点天线数目的增加,系统中断概率降低。其次,研究系统信源节点和中继节点采用重复累积(Repeat-Accumulate,RA)码时的误码性能,结果表明该系统误码性能优于相同条件下的点对点系统。

Aiming to break through the energy limitation of the relay,this paper studies the multi-source coded cooperative system based on energy harvesting. Firstly,for the two-source single-relay coded cooperative system,a relay node configured with multiple antennas simultaneously performs energy harvesting and information decoding by energy harvesting technology. Furthermore,at the relay,the water-filling algorithm is used to allocate the harvested energy to multiple antennas,and the outage probability of the system is derived. Theoretical analysis and simulation results demonstrate that the system can obtain better outage probability performance by the water-filling algorithm. The simulation results also show that as the energy conversion efficiency or the number of antennas at the relay increases,the outage probability of the system decreases. Secondly,when the sources and relay use repeat-accumulate（ RA） codes in the proposed system are studied,the results show that the performance of bit error rate（ BER） of the proposed system is better than that of the point-to-point system under the same conditions.