天线多中继系统中分布式预编码方案的研究

Study on Distributed Precoding Scheme in Antenna Multi-Relay System

在天线多中继系统优化问题的研究中,一般多中继系统源节点到中继和中继到目的节点的两个阶段的信道矩阵必须与其它中继节点共享,将使得系统开销增大。针对以上问题,提出了一种中继节点之间信道状态信息(CSI)连续共享方案。在源节点发送过来的CSI中,不是采用传统的以广播方式发包给所有中继,而是根据相位信息与中继节点矩阵的匹配,通过中继发送到目的节点。在中继节点处设计一种多用户分布式预编码方案,以改善和平衡目的节点接收信号的功率,使接收机实现相干合成,完成系统优化设计。仿真表明,提出的编码方案提高了系统容量,降低了编码复杂度,缓解了多入多出多中继系统中多路信号之间的干扰,提高系统的频谱效率,能很好地适用于多中继系统中。

In general multi-relay system, the two stages of the channel matrix, source node to relay and relay to destination node, must be shared with other relay nodes, which will increas the system spending. To solve the prob- lems, this paper put forward a solution of continuous sharing channel state information （CSI） among multiple relay nodes. The CSI from original[ nodes was sent to the target node according to the maching between its phase information and rely node matrix, instead of being sent to all relay nodes as in traditional broadcasting method. Then, a distribu- ted multiuser precoding scheme was presented to improve and balance the received signal power, which achieved the signals coherent combination and completed the system design finally. Simulation results show the proposed distribu- ted precoding scheme improves the system capacity, reduces the encoding complexity, alleviates the multipath inter- ference of the MIMO multi-relay system, and improves the system spectrum efficiency.