基于APSK信号的分布式MIMO差分检测方法

A Differential Detection Scheme Using APSK Signals for Distributed MIMO Systems

提出一种基于APSK信号的分布式MIMO差分编码及检测方法:发送端将待发射的数据符号与前一个发射矩阵中的数据符号进行相位和幅度差分调制,生成新的发射矩阵进行发射;接收端对接收信号匹配滤波之后,利用前后接收量判断相位信息和幅度信息恢复出发送端数据。该方法使得系统无需进行信道估计,频谱效率与V-BLAST(Vertical Bell Laboratories Layered Space-Time)相同,但不受天线数目限制,解决了传统V-BLAST算法无法进行非相干检测的难题。仿真结果显示,该算法在不同信道传播时延情况下的误码率性能不同。

A differential encoding and detection scheme is proposed which is based on APSK （Amplitude Phase Shift Keying） signals. At the transmitter, transmitted signals are differentially modulated using phase and amplitude. The phase and amphtude information is detected using two consecutive received signal vectors, and the transmitted symbols are estimated by the phase and amplitude information. The proposed scheme does not need to know the channel state information. It has the same spectral efficiency as V -BLAST （Vertical Bell Laboratories Layered Space -Time） scheme and it is unrestricted by the number of antenna. The proposed scheme is evaluated in different channel propagation delay cases, and the simulation results show that the BER（ Bit Error Rate） performance is different corresponding to different channel propagation delay cases.