A peak power reduction scheme based on reversal of parity-bits for a block-coded OFDM signal

We propose a peak power reduction (PPR) scheme based on the reversal of parity-bits for a block-coded OFDM signal. In our PPR scheme, the entire parity-check block of the codeword is adaptively reversed, symbol-by-symbol, so as to minimize the PAPR of the OFDM-signal. At the receiver, the original codeword can be restored with sufficient accuracy by checking the syndrome of the received codeword and protecting a significant-bit of the codeword from transmission error. When (7,4), (31,21) and (31,26) BCH codes are employed, the PAPR of the OFDM signal, at the CCDF (complementary cumulative distribution function) of 10/sup -4/, can be reduced by about 2.8, 2.5 and 2.0 dB, respectively, by applying the PPR scheme while achieving approximately the same BER performance as the case without PPR in an exponentially decaying 6-path Rayleigh fading condition.