MIMO-OFDM系统中基于压缩感知的信道参数反馈方法

摘要

为了解决MIMO-OFDM系统中基于完全信道状态信息预编码所面临的反馈链路开销大的问题,提出将压缩感知技术应用于这种预编码的信道状态信息的反馈阶段.在接收端通过压缩感知技术对由信道估计得出的信道状态信息进行观测,将少量的观测值反馈到发送端,在发送端通过正交匹配追踪算法重构出完全信道状态信息.仿真结果表明,信道状态信息在KLT域的压缩感知性能明显优于DCT域的压缩感知性能,可以由反馈.到发送端的少量采样值精确地重构出信道状态信息,降低了反馈链路的开销.%In order to solve the problems of large overhead in the feedback link of pre-coding due to the full channel state information , this paper proposed a channel parameters feedback method based on compressed sensing for MIMO-OFDM pre-coding. At the receiver, it observed channel state information which resulted from the channel estimation by compressed Sensing measurement matrix. Then a small amount of measurements were fed back to the sender. In the sender, it reconstructed the channel state information through orthogonal matching pursuit algorithm. Simulation results show that the compressed sensing in KLT which can recover the channel state information accurately via a small amount of samples that fed back to the transmitter is superior to the compressed sensing in DCT and decreases the overhead in the feedback link.