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In this paper, the authors analyzed the performance of different diversity techniques, which can be easily applied with Orthogonal Frequency Division Multiplexing (OFDM) systems with different equalizing methods. Orthogonal frequency division multiplexing is well known to be a useful technique for high rate data transmission over a frequency selective fading channel. However, for coherent detection of OFDM signals, fading compensation techniques are required to mitigate amplitude and phase distortions due to the multi-path channel fading. The fading compensation technique becomes even more crucial when QAM is used for OFDM systems.
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