Title :
Improved Peak-to-Mean Envelope Power Ratio Reduction for Long OFDM 16-QAM Sequence
Author :
Pu, Fangling ; Gong, Jianya
Author_Institution :
Sch. of Electron. Inf., Wuhan Univ., Wuhan
Abstract :
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.
Keywords :
AWGN channels; Golay codes; OFDM modulation; Rayleigh channels; error statistics; quadrature amplitude modulation; 16QAM sequence; AWGN channel; Golay sequences; OFDM sequence; Rayleigh fading; additive white Gaussian noise channel; bit error rate; complementary cumulative distribution function; optimal phase rotation factors; orthogonal frequency division multiplexing sequences; partial transmit sequences technique; peak-to-mean envelope power ratio reduction; quadrature amplitude modulation; AWGN; Acoustical engineering; Additive white noise; Bit error rate; Computational complexity; Constellation diagram; Gaussian noise; OFDM modulation; Partial transmit sequences; Phase shift keying;
Conference_Titel :
Wireless Communications, Networking and Mobile Computing, 2007. WiCom 2007. International Conference on
Conference_Location :
Shanghai
Print_ISBN :
978-1-4244-1311-9
DOI :
10.1109/WICOM.2007.127
