复数域符号相乘的差分网络编码

摘要

Under the decoding and forwarding mode,traditional differential network coding schemes involve complicated procedures of detection and re-coding at relay nodes.To solve this issue,a differential network coding scheme with symbol multiplying in complex field is presented.Consequently,two relay detection meth-ods are proposed,w hich can reduce the detection and recoding complexity significantly at relay nodes.In order to achieve the high order diversity gain,the proposed differential network coding is extended to multi-relay set-ting.As a result,a differential random space-time network coding scheme is presented,where the cooperative diversity order that can be achieved is equal to the activated relay number.The analysis and simulation results validate the proposed differential network coding schemes in both single-and multi-relay settings.%传统差分网络编码在解码转发方式下编码环节繁杂、中继检测复杂度高.基于此,文中提出复数域符号相乘的差分网络编码,并构建了中继检测方法一和中继检测方法二,能显著降低中继的检测和编解码复杂度.同时,将提出的编码方法拓展到多中继协作方式以获取高阶协作分集增益,并得到随机差分空时网络编码,其能获得的分集增益阶数为解码正确的中继个数.仿真实验和理论分析均验证了提出的复数域符号相乘的差分网络编码方法在单中继和多中继协作方式下的有效性.