A study on complexity reduction of MIMO-ICI canceller in mobile reception of OFDM

In the next-generation wireless communication systems, further advance of OFDM (Orthogonal Frequency Division Multiplexing) and MIMO (Multi-Input Multi-Output) system is required. One of the major problems to be considered is ICI (Inter-Carrier Interference) generated by Doppler-spread under mobile reception of MIMO-OFDM systems. In this situation, reception characteristics are deteriorated significantly. The ICI canceller for MIMO-OFDM with complexity reduction can demodulate transmitted symbols. In order to realize an ICI canceller, it is necessary to reduce the complex calculations such as matrix operations. Therefor, complexity reduction of a MIMO-ICI canceller is proposed. Proposed complexity reduction scheme of a MIMO-ICI canceller can improve the influence of ICI with reduced complexity. The performance of the proposed scheme is evaluated by simulations.