Analysis of Compressed CSI Feedback in MISO Systems

Compressed sensing based channel state information (CSI) feedback schemes have been investigated as a feasible solution for massive antenna systems. Most of research works have focused on the measurement matrix design based on the sparsity obtained from spatially correlated channels. In this letter, we analyze the feasibility of a compressed CSI feedback based on the sparsity obtained from temporally correlated channels. The compressed feedback distortion and its rate loss in temporally correlated channels are analyzed as a function of the sparsity level and the number of transmit antennas, which are compared to those in uncorrelated channels. Based on the numerical analysis and simulation results, it is demonstrated that utilizing the sparsity obtained from temporally correlated channels is feasible for the compressed CSI feedback.