Co-Channel Interference Cancellation in OFDM Networks Using Coordinated Symbol Repetition and Soft Decision MLE CCI Canceler

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Executive Summary

In this paper, a new scheme of downlink Co-Channel Interference (CCI) cancellation in OFDM cellular networks is introduced for users at the cell-edge. Coordinated symbol transmission between Base Stations (BS) is operated where the same symbol is transmitted from different BS on different subcarriers. At the Mobile Station (MS) receiver, the authors introduce a soft decision maximum likelihood CCI canceler and a Modified Maximum Ratio Combining (M-MRC) to obtain an estimate of the transmitted symbols. Weights used in the combining method are derived from the channels coefficients between the cooperated BS and the MS. Simulations show that the proposed scheme works well under frequency-selective channels and frequency non-selective channels.

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