基于复数域上的网络编码的MIMO系统预编码器设计

Precoder design for MIMO systems with complex field network coding

针对复数域网络编码中复数θ的选取以及中继和目的节点处如何有效检测原始数据的问题,提出一种收发联合优化的预编码方案。设计一种等相位预编码器选取编码复数θ以降低数据传输过程中的误码率,提出一种迭代预均衡算法在中继和目的节点处检测和恢复原始数据,在提高系统信道容量的同时改善整个系统的抗干扰能力。仿真结果显示,该方案相对现有复数域网络编码方案能够获得更低的误码率,且在无信道状态信息的情况下也能获得较线性预均衡方案更低的误码率以及更高的信道容量。

In order to solve the problem of selecting 0 in CFNC and how to effectively detect original data at relay and destination nodes, this paper proposed a novel pre-coding scheme which jointly designed both the sender and receiver. Firstly, it proposed an equiphase precoder scheme which used for choosing 0 of CFNC to acquire lower symbol error probability （SEP）. Meanwhile, it presented an iterative equalization algorithm for detecting and recovering initial data at relay and destination nodes. This algorithm could gain higher channel capacity as well as improve it＇ s resistance to interference. Moreover, simulation results show that the new scheme significantly outperforms its counterparts both in reducing the SEP and increasing the channel capacity of the whole system without channel state information at the transmitter （CSIT）.