Two-Stage Interference Cancellation with Compressive CSI Feedback for Limited RF Chains Systems

Abstract

Massive multiple-input multiple-output (MIMO) is an emerging approach for wireless communications thanks to its energy efficiency and high system capacity The benefits of massive MIMO systems can be realized only when channel state information (CSI) is available at the transmitter In frequency division duplexing (FDD) operation users have to feed back CSI to the transmitter Since the amount of CSI grows with the number of antennas CSI feedback overhead becomes extraordinarily large in massive MIMO systems In this work we proposed a new approach based on compressive sensing to reduce the long-term CSI overhead for the two-stage feedback system The proposed approach permits the transmitter to obtain long-term CSI with acceptable accuracy while substantially reducing feedback overhead Besides we extend the scenario to multi-cell system where inter-cell interference(ICI) must be canceled to maintain desired service quality Two approaches are considered to eliminate ICI based on different CSI feedback mechanisms Simulation results are presented to evaluate the performance of the proposed methods in comparison with some existing approaches

Date of Award	2019
Original language	English
Supervisor	Kuang-Hao Liu (Supervisor)