CSI Compression Method With Dual Differential Feedback for Next-Generation Wi-Fi Networks

The multiple-input multiple-output (MIMO) technology improves Wi-Fi throughput by increasing the number of antennas. However, with more antennas and developing coordinated MIMO operations, the amount of channel state information (CSI) increases. As the CSI-induced overhead limits the performance of Wi-Fi networks, this letter proposes a new low-complexity dual differential CSI compression method that significantly reduces this overhead. Experimental and simulation results in diverse scenarios show that the proposed algorithm overcomes state-of-the-art algorithms of similar complexity, reducing the feedback size by up to 40%.