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OFDM peak power reduction by sub-block-coding and its extended versions

A scheme is proposed to reduce the peak-to-average power ratio of OFDM signals and also to detect transmission errors. The proposed scheme is termed sub-block-coding. Two extensions of the sub-block-coding are also proposed in the form of redundant bit location optimized sub-block-coding and combination-optimized sub-block-coding. Performance results obtained with sub-block-coding are given and compared with that of the cyclic coding scheme proposed by Wulich (see Electron. Lett., vol.32, no.5, p.432-3, 1996) for the same purpose. The results show that, at the same code rate 3/4, the proposed scheme can achieve the same performance as the cyclic code but with lower complexity. The results obtained with the two extended techniques are also given and compared with that of the sub-block-coding. It was found that at code rate 3/4, these two new techniques can achieve a higher peak-to-average power ratio reduction than the standard sub-block-coding.