摘要
针对基于完全信道状态信息预编码的长期演进(LTE)多输入多输出-正交频分复用(MIMO-OFDM)系统面临反馈开销很大的问题,提出了基于压缩感知的反馈方案,该方案利用压缩感知技术在接收端对信道估计得到的信道信息进行观测,并将观测值反馈到发送端,在发送端通过梯度投影算法重构信道状态信息。通过仿真证明,该反馈方案在大幅减小反馈开销的同时达到了与完全信道状态信息反馈时非常接近的性能。
Aiming at the problem that long term evolution （LTE） multiple input multiple output-orthogonal frequency division multiplexing （MIMO-OFDM） system based on the complete channel state information precoding is faced with large feedback consumption, this paper proposes a feed- back scheme based on compressed sensing, which uses compressed sensing technique to observe the channel state information resulted from channel estimation at the receiving port, then the measurement values are fed to the transmitting port, reconstructs the channel state information through gradient projection algorithm at transmitting port. Simulation results show that the feedback consumption has been obviously reduced through the feedback scheme, at the same time the achieved performance is close to the performance while complete channel state information is fed.
出处
《舰船电子对抗》
2014年第2期53-56,共4页
Shipboard Electronic Countermeasure
关键词
多输入多输出
压缩感知
信道状态信息反馈
梯度投影
multiple input multiple output lcompressed sensing
channel state information feedback
gradient projection
