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An Improved PAPR Reduction Using Sub-block Phase Weighting (SPW) Method in OFDM Communication System  

Kim Sun-Ae (Dept. of Electronic Engineering, Chungbuk National University)
Kang Yeong-Cheol (Dept. of Electronic Engineering, Chungbuk National University)
Suh Jae-Won (Dept. of Electronic Engineering, Chungbuk National University)
Ryu Heung-Gyoon (Dept. of Electronic Engineering, Chungbuk National University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.16, no.11, 2005 , pp. 1123-1130 More about this Journal
Abstract
In this paper, we propose an improved side information processing scheme which is important in the sub-block phase weighting(SPW) method for the peak-to-average power ratio(PAPR) reduction. SPW method is to divide the input OFDM subchannels into several subblocks and to multiply phase weighting with each subblocks, properly for the reduction of the peak power. SPW method is similar to the conventional PTS method when the number of sub-carriers, signal modulation format and the number of subblocks are the same. However, unlike the conventional PTS(Partial Transmit Sequence) and SLM(Selected Mapping) method using many stages of IFFT(Inverse Fast Fourier Transform), SPW method only needs one IFFT. Although PAPR can be reduced by SPW method, complex computation burden still remains. In this paper the flipping algorithm and the full iteration algorithm are used f3r the phase control method. Through the computer simulation, we analyze and discuss the properties and the performance of the suggested method.
Keywords
OFDM; PAPR; HPA; SPW;
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