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For frequency-division-duplexing (FDD) systems, channel state information(CSI) should be fed back from the user terminal to the base station. Thisfeedback overhead becomes problematic as the number of antennas grows. Toalleviate this issue, we propose a flexible CSI compression method usingvariational autoencoder (VAE) with an entropy bottleneck structure, which cansupport multi-rate and variable-length operation. Numerical study confirms thatthe proposed method outperforms the existing CSI compression techniques interms of normalized mean squared error.

Multi-Rate Variable-Length CSI Compression for FDD Massive MIMO