Improved Peak-to-Mean Envelope Power Ratio Reduction for Long OFDM 16-QAM Sequence

An improved method to reduce the peak-to-mean envelope power ratio (PMEPR) of long orthogonal frequency division multiplexing (OFDM) sequences over 16-quadrature amplitude modulation (16-QAM) is presented. The long OFDM symbol is divided into several subblocks, which are constructed from two Golay sequences. Partial transmit sequences (PTS) technique is used to modify the phase of each subblock. The optimal phase rotation factors, which are encoded by Golay sequence and transmitted through selected subcarriers, are obtained as minimizing the PMEPR of the constructed OFDM symbol. The complementary cumulative distribution function (CCDF) of PMEPR and bit error rate (BER) through Rayleigh fading and additive white Gaussian noise (AWGN) channel illustrate the effectiveness of the proposed method.