频率选择性信道下空时分组码直接盲信号检测算法

Blind Signal Detection for Space-Time Block Coding in Frequency-Selective Scenario with Linear Pre-Coding

针对空时分组码系统中训练序列的引入会降低系统传输效率的问题,提出了一种在频率选择性衰落信道下无需信道估计直接对空时分组码进行盲信号检测的算法.该算法在发射端采用线性预编码并且在接收端采用子空间方法进行解码.和已提出的其他盲信号检测算法不同,它可以在未知信道信息的情况下以满速率发送和接收信号并获得满的分集增益.该算法可以被推广到有任意发射天线数的空时编码结构.Monte Carlo仿真实验表明,该算法和使用准确信道信息的解码算法性能相近.

Focusing on the problem that training sequences will decrease the transmission efficiency in the space-time block code (STBC) system, a method that can detect the STBC coded signals transmitted over the frequency-selective channels without knowing the channel state information (CSI) was proposed. This blind detection algorithm used a linear pre-coding STBC scheme at the transmitter side and a subspace method at the receiver side in order to achieve the full frequency diversity. Unlike other existed blind signal detection schemes, the proposed method was able to achieve the full diversity at the full transmit and receive rate without knowing the CSI and could be generalized to other STBC schemes with any number of transmit antennae. The Monte-Carlo simulations demonstrated that the performance of the proposed blind method was similar to that of the method knowing the CSI.