Abstract-In a multiple-input multiple-output (MIMO) system, the availability of channel state information (CSI) at the transmitter is essential for performance improvement. Recent convolutional neural network (NN)-based techniques show competitive ability in realizing CSI compression and feedback. By introducing a new NN architecture, we enhance the accuracy of quantized CSI feedback in MIMO communications. The proposed NN architecture invokes a module named long shortterm memory that admits the NN to benefit from exploiting temporal and frequency correlations of wireless channels. Compromising performance with complexity, we further modify the NN architecture with a significantly reduced number of parameters to be trained. Finally, experiments show that the proposed NN architectures achieve better performance in terms of both CSI compression and recovery accuracy. Index Terms-Channel state information (CSI) feedback, recurrent neural network (RNN), multiple-input multiple-output (MIMO).
In REF , a new LSTM network further reduced the number of parameters to be trained while maintaining the CSI recovery accuracy.
MIMO Channel Information Feedback Using Deep Recurrent Network
IEEE Communications Letters
IEEE Communications Letters
Mathematics Computer Science