Analysis of OFDM error rates over nonlinear fading radio channels
IEEE Transactions on Wireless Communications
Nonlinear spreading for communications in co-band interference channels
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
Iterative soft compensation for OFDM systems with clipping and superposition coded modulation
IEEE Transactions on Communications
Diversity-enabled and power-efficient transceiver designs for peak-power-limited SIMO-OFDM systems
EURASIP Journal on Advances in Signal Processing - Special issue on advanced equalization techniques for wireless communications
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We derive tight closed-form approximations of symbol and bit error probability on maximum-likelihood sequence detection (MLSD) of Nyquist-rate and oversampled OFDM systems over the AWGN, flat and frequency-selective quasi-static Rayleigh fading channels. Contrary to common knowledge, we show that on a frequency-selective channel, clipping at the transmitter leads to achievable frequency-diversity and performance gain over unclipped systems with MLSD. We derive closed-form expressions of the diversity and the performance gain over the no-clipping case, as well as the optimal clipping ratio for a given system. We show that such diversity and performance gain are a result of both clipping and channel frequency-selectivity, and they do not occur on the AWGN and flat fading channels.We also present a new near-optimum detection algorithm that achieves the MLSD performance bound with a few iterations for the clipped OFDM systems with both high and low clipping levels on the AWGN and flat Rayleigh fading channels. For the frequency selective channel, we present a receiver design that utilizes the advantage of clipping to some extent. We consider rectangular QAM signaling in this paper.