Recursive CSI Quantization of Time-Correlated MIMO Channels by Deep Learning Classification
This work addresses efficiency issues in wireless communications for large MIMO systems, though it appears incremental as it builds on a previously proposed recursive quantizer.
The paper tackles the problem of high complexity and feedback overhead in CSI quantization for FDD MIMO systems by combining a recursive Grassmannian quantizer with deep learning classification, achieving significant complexity reduction and exploiting temporal correlations to lower feedback overhead.
In frequency division duplex (FDD) multiple-input multiple-output (MIMO) wireless communications, limited channel state information (CSI) feedback is a central tool to support advanced single- and multi-user MIMO beamforming/precoding. To achieve a given CSI quality, the CSI quantization codebook size has to grow exponentially with the number of antennas, leading to quantization complexity, as well as, feedback overhead issues for larger MIMO systems. We have recently proposed a multi-stage recursive Grassmannian quantizer that enables a significant complexity reduction of CSI quantization. In this paper, we show that this recursive quantizer can effectively be combined with deep learning classification to further reduce the complexity, and that it can exploit temporal channel correlations to reduce the CSI feedback overhead.