一种新的迭代判决反馈差分空时检测算法  

A Novel Iterative Decision Feedback Differential Space-Time Detection Algorithm

作　　者：黄炳刚[1] 周志杰[1] 邱国防[1] 

机构地区：[1]解放军理工大学通信工程学院,江苏南京210007

出　　处：《信号处理》2009年第3期341-346,共6页Journal of Signal Processing

摘　　要：针对快衰落信道,提出了Turbo码与块差分空时调制(BDSTM)串行级联的差分空时设计方案,并以该设计方案为基础,提出了一种新的迭代判决反馈差分空时检测(IDF-DSTD)算法。该算法实现了具有软输入软输出的判决反馈差分空时检测(SISO DF-DD),一方面在判决反馈线性滤波器中通过引入先验信息,提高了线性预测的准确性,另外,SISO DF-DD与外侧Turbo译码器之间通过边信息的交换实现了迭代检测与译码。仿真结果表明,在未知信道状态信息(CSI)的条件下,本文算法的误码性能接近已知CSI的相干检测,优于判决反馈块差分空时调制(DFBDSTM)约2dB。A concatenated decision feedback block differential space-time modulation scheme with turbo code is presented for rapidly flat-fading channels. A novel iterative decision feedback differential space-time detection algorithm named IDF-DSTD is put forward to demodulate the proposed scheme. Within IDF-DSTD differential space-time detection with soft inputs and soft outputs is realized and more accurate estimation is achieved by using a priori information in the decision feedback linear prediction filter. At the same time combining iterative decoding and space-time detecting is carried out between SISO DF-DD and turbo decoder by exchanging extrinsic in- formation. Simulation results show that the performance of the proposed design is close to coherent detection and better than decision feedback block differential space-time modulation about 2dB without channel state information.

关 键 词：差分空时调制 快衰落信道 判决反馈差分检测 软输入软输出 

分 类 号：TN911.3[电子电信—通信与信息系统]