Low-complexity Parameter Update for Spatio- Temporal Filter to Suppress the Cochannel Interference in MIMO-OFDM Mobile Communication System

This paper proposes a low-complexity parameter update algorithm to spatio-temporal filter for suppressing the cochannel interference in multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) modulation systems. The conventional spatiotemporal filter employs the recursive eigenvalue decomposition algorithm to perform the parameter estimation and update. In the mobile environment, all the points during a data OFDM symbol are used for parameter update. This paper proposes an incomplete parameter update for the conventional spatio-temporal filter, where only a fraction of points during a data OFDM symbol are used for parameter update, while the others are ignored. In this way, the computational complexity of the parameter update can be reduced to some extent with negligible performance degradation. Computer simulations under IEEE 802.11a demonstrate the validity of the proposed incomplete parameter update algorithm.