基于叠加编码的协作传输与性能分析

Cooperative Transmission and Performance Analysis Based on Superposition Coding

针对传统三节点协作通信模型中的中继节点无偿为源节点转发数据,造成频谱效率降低的问题,基于解码转发协作协议,提出一种基于叠加编码的协作传输模式,并对其传输速率和中断概率进行分析。该模式利用链路层控制信息的交换获得链路状态信息,以提高系统传输速率为目标,在中继处利用叠加编码将中继信息与源节点信息进行叠加发送。仿真结果表明,与传统三节点协作传输模式相比,该传输模式能够有效提高系统的传输速率。

In the traditional three-node cooperative communication model,relay nodes forward data for free for source nodes,which reduces the spectral efficiency.To address the problem,this paper proposes a cooperative transmission mode based on the Decode-and-Forward(DF)cooperative protocol using superposition coding,and analyze its transmission rate and outage risk.In order to improve the cooperative transmission rate of the system,the mode obtains Channel Status Information(CSI)through the exchanges of control information in the link layer,and uses superposition coding at the Relay nodes to implement superposition transmission of the relay node information and source node information.Simulation results show that compared with the traditional three-node cooperative transmission mode,the proposed mode can effectively improve the transmission rate of the system.