Co-channel Interference Mitigation for 3G LTE MIMO-OFDM Systems

We propose an algorithm to reject co-channel interference in 3GPP long term evolution (LTE) multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) systems. An improved channel estimation method and interference rejection algorithm are discussed. The interference information is measured on the pilot sub-carriers which are sent regularly in time and frequency. An improved model averaged interference mitigation method parameterizes the interference and noise spatial-covariance-matrix on each carrier as a combination of several low-rank models, each associated with probability soft information. A reduced complexity a posteriori receiver is derived based on the low-rank spatial covariance model. Parameterizing the interference and noise covariance matrix helps in adapting receiver for different interference scenarios. Simulation results are provided to demonstrate the efficacy of the model averaged interference rejection method applied to MIMO-OFDM system.