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This paper presents a theoretical performance analysis of downlink orthogonal frequency-division multiplexing (OFDM) cellular radio communication systems. An accurate interference model that takes into account the cochannel and interchannel interference caused by both frequency and timing synchronization errors in adjacent and cochannel cells is developed. The effect of frequency-selective fading on the interfering signals has also accurately been taken into consideration. Based on this model, accurate expressions are given for average bit error rates (BERs) of OFDM-based M-ary quadrature amplitude modulation (QAM). These are extended to include multichannel reception with maximal ratio combining diversity.
Date of Publication: Sept. 2009