基于AF-CDC-OFDM的差分网络编码

AF-CDC-OFDM based differential network coding

在多子载波、频率选择性衰落、双向中继转发信道中提出多中继协作的基于AF-CDC-OFDM的差分网络编码方法。通过多个协作中继的分布式循环延时编码及功率放大处理,两路终端发送的差分编码分组可获得完全的协作分集和频率分集增益。两路终端在检测对方的发送信号之前需要消除自干扰信号,为此,提出基于统计相关的自干扰分量估计方法。仿真结果表明,提出的差分网络编码能够获得完全的分集增益性能,对应的自干扰分量相关统计估计算法在慢衰落信道中与干扰分量完全消除的检测性能相比,仅有0.5dB的信噪比损耗。

Based on the amplify and forward-cylic delay codes-orthogonal frequency division multiplexing （AF-CDC-OFDM）technology,a differential network coding method with multi-relay cooperation is proposed over the multi-carrier and frequency selective two-way relay channel.The two-way terminals can obtain the maximum cooperation di-versity gains and frequency diversity gains through the distributed relay cyclic delay coding and power amplification pro-cessing.However,the two terminals need to eliminate the self-interference component among received signals before detecting the transmit symbol.Therefore,a self-interference elimination method is proposed with correlation statistical processing.The simulation results demonstrate that the proposed differential network encoding method can obtain the full diversity gain,and the proposed self-interference component eliminating method only has 0.5 dB SNR loss compared with the Genie-aided method over the slow fading channel.