A novel Haar wavelet-based precoded BPSK-OFDM system with reduced PAPR  

作　　者：黄新林 Wang Gang Liao Quanrui Sun Qingquan 

机构地区：[1]Communication Research Center, Harbin Institute of Technology,Harbin 150001, P. R. China [2]Department of Electrical and Computer Engineering, The University of Alabama, Tuscaloosa, AL 35487 USA

出　　处：《High Technology Letters》2011年第1期25-31,共7页高技术通讯（英文版）

摘　　要：The performance of OFDM systems may be degraded when intersymbol interference （ISI） channels have spectral nulls. Recently, the precoded OFDM was proposed to combat this problem. However, due to inserting （M- K） zeros between each two sets of K consecutive information symbols, the average transmitting power of the precoded OFDM system reduces by 10log10（M/K） dB compared with the conventional OFDM system. Under the same points inverse fast Fourier transformation （IFFF）, the precoded OFDM system has a higher peak-to-average power ratio （PAPR） compared with the conventional OFDM system. This paper proposes a novel precoded BPSK-OFDM system based on Haar wavelet transformation. The Haar wavelet transformation operating decomposition over the vector information symbols produced by a precoder shows that half of the information symbols are zeros and the rest are either √2- or √2. Then, we have the peak power and PAPR reduced by 10log1002=3dB at most compared with the precoded OFDM system. Finally, we compare PAPR of the proposed OFDM system with the precoded OFDM and the conventional OFDM system.

关 键 词：peak-to-average power ratio （PAPR） Haar wavelet BPSK precoded OFDM. 

分 类 号：TN929.5[电子电信—通信与信息系统] U472.41[电子电信—信息与通信工程]