基于差分调制的编码协作方案  

A Coded Cooperation Scheme Based on Differential Modulation

作　　者：林一[1] 韩春雷[1] 宫丰奎[1] 张丰[1] 

机构地区：[1]西安电子科技大学综合业务网理论及关键技术国家重点实验室,陕西西安710071

出　　处：《无线电通信技术》2008年第5期13-15,共3页Radio Communications Technology

基　　金：国家高技术研究发展计划(863计划)项目(2006AA01Z270);陕西省自然科学基金(2007F07)

摘　　要：通常的编码协作采用相干检测方式，要求精确的信道估计，从而增加了系统实现复杂度。考虑采用非相干检测，提出了一种基于差分调制的编码协作方案，并分析了该方案下系统协作与非协作的误码率性能，并在目的端引入CRC校验方法进一步提高用户上行信道不对称时的系统性能。仿真表明：进行协作后系统可以达到完全分集。当源端用户比协作用户上行信道信噪比高时，提出的方案可使系统性能改善0．2～1．2dB。Coherent detection is always used in coded cooperation system, but it needs accurate channel estimation, which increases the system complexity. A differential modulation scheme with non-coherent detection is presented. Bit Error Ratio （BER） expression of cooperation and non-cooperation in the differential coded cooperation system are investigated. With a CRC method implemented at the destination, the performance can be improved under the asymmetric uplink channel conditions. Simulation results show that full diversity is provided with cooperation, and the system performance is improved by 0.2- 1.2 dB when the uplink channel SNR of the source is better than that of the cooperation user.

关 键 词：编码协作 差分调制 协作分集 循环冗余校验 

分 类 号：TN929.5[电子电信—通信与信息系统]