双向多天线系统下的栅格网络编码

Lattice network coding for two-way MIMO system

多天线技术作为一种能够有效提高系统传输性能的技术,在无线通信领域得到了广泛的关注。在双向多天线系统中采用网络编码可以使两个源节点的信息交互在两个阶段内完成,而结合栅格编解码可以在保证低误码率的基础上进一步提高网络编码方案的传输速率,达到理论的信道容量的下界。首先介绍了衰落信道下双向多天线系统中结合栅格编码的网络编码传输方案,并给出了采用该方案时系统的最大容量下界。同时对多天线系统中预编码进一步优化能提高系统性能,并给出传输方案的性能仿真结果。

As an efficient technique to improve the system performance,Multiple Input Multiple Output（MIMO）technology has drawn much attention in the wireless communication field.Applying network coding technology in two-way MIMO system can allow the information exchanging between two sources to be completed in two phase communication.The achievable rate of network coding scheme can be improved,getting to the lower bound of the capacity,when combining with the Lattice encoding/decoding techniques based on low error rate.This paper introduces the lattice network coding communication scheme in two-way MIMO system under the fading channels.At the same time it analyses the maximum achievable rate when applying the scheme proposed.Also an optimized scheme is proposed to enhance the system performance further,and numerical results are provided.