双向中继信道下迭代差分接收机设计  

The Design of Iterative Differential Receiver for Two-way-relay Channel

作　　者：孔磊[1] 董长富[1] 曹敏[1] 贾锋[1] 

机构地区：[1]西安通信学院,西安710106

出　　处：《无线通信技术》2016年第3期28-33,共6页Wireless Communication Technology

摘　　要：物理层网络编码(PNC)能够将系统吞吐量提高一倍,其实现方式多基于相关解调,然而实际无线信道具有快时变、多径传播等特点,导致瞬时信道状态信息难以获取,本文针对这一问题基于比特交织编码迭代译码系统提出了一种基于差分调制的非相干物理层网络编码接收机设计方案,在没有信道状态信息(CSI)的条件下中继接收机能够基于非相干解调得到网络编码比特的对数似然比(LLR),然后通过软译码和迭代反馈进一步提高系统抗噪声性能,实验结果表明该方案可以实现可靠的物理层网络编码非相干接收。PNC can improve the system throughput by more than one times, and most adopt the co-herent demodulation method. However, the physical wireless channel has the characteristics of fasttime variation and multipath effect, which leads to the instantaneous CSI is not easy to obtain. Thispaper put forward a non - coherent design scheme of PNC receiver with differential modulation,which is based on the bit interleaved encoding and iterative decoding system. In the absence of CSI,the LLR of the network coding bit can be obtained based on the non - coherent demodulation, thenwe can improve the performance of the system with soft decoding and iterative feedback. The experi-mental results show that the proposed scheme can achieve the non - coherent reception of the PNC.

关 键 词：差分接收机 双向中继 物理层网络编码 非相干解调 

分 类 号：TN911.22[电子电信—通信与信息系统]