信道预测和天线选择的空时码DE-QPSK误码性能分析

Symbol Error Rate Performance of DE-QPSK with Predictive Transmit Antenna Selection and Orthogonal Space-Time Block Code

克服因反馈时延引起的无线通信系统误码性能恶化问题的一种有效手段,是采用最小均方误差(MMSE)维纳滤波信道预测器,并推导了瑞利块衰落信道上采用信道预测发射天线选择(TASP)/正交空时分组码(OSTBC)的相干检测差分编码四相相移键控(DE-QPSK)的平均误符号率(ASER)精确和近似解析表达式。仿真结果验证了上述理论分析的正确性和近似计算的准确性,DE-QPSK的ASER解析表达式可以用于快速评估收发天线数、信道预测器长度等参数对TASP/OSTBC无线通信系统ASER性能的影响,为TASP/OSTBC系统设计提供指导。

An effective method to overcome the error performance degradation of wireless communication system caused by the feedback delay is to use MMSE （Minimum Mean Square Error） Wiener filter charmel predictor. The exact and approximate analytical expressions for ASER （Average Symbol Error Rate） of DE-QPSK （Differentially- Encoded Quadri-Phase Shift Keying） with predictive TAS （Transmit Antenna Selection） / OSTBC （Orthogonal Space-Time Block Code） over Rayleigh block fading channel are derived. The simulation results verify the correctness of above theoretical analysis and the accuracy of the approximate calculation. ASER analytical expression of DE-QPSK can be used to quickly evaluate the influence of such parameters as the number of transmitting and receiving antennas and channel predictor length on the performance of TAS/OSTBC wireless communication system ASER. And this could provide a guidance for TAS/OSTBC system design.