一种抑制多路OFDM信号峰均比的SG-PTS算法

doi:10.19665/j.issn1001-2400.2019.05.018

Abstract

Abstract:

The multi-channel orthogonal frequency division multiplexed (OFDM) signal is constructed of multiple OFDM signals from different frequency bands. The peak-to-average power ratio (PAPR) of the multi-channel OFDM signal is much larger than that of the single-channel OFDM signal. The PAPR reduction algorithms for the single-channel OFDM signal are difficult to apply to multi-channel OFDM systems directly. In this paper, a group PTS(G-PTS) algorithm and a simplified group PTS(SG-PTS) algorithm have been proposed. In the proposed methods, all the multi-channel OFDM signals are divided into different groups and in each group the signals are added directly. Then, the output signal of each group is further added with a different phase rotation factor. The PAPR of the signal can be reduced by selecting the optimal phase rotation factor combination. In addition, compared with the G-PTS algorithm, the computational complexity of finding the optimal phase rotation factor combination can be further reduced by the SG-PTS algorithm. Simulation results have shown that the SG-PTS algorithm can reduce the PAPR of multi-channel OFDM signals effectively, and that its implementation complexity is moderate. Thus, the proposed PAPR reduction algorithms are suitable for practical multi-channel OFDM systems.

Key words: orthogonal frequency division multiplexing, peak-to-average power ratio, partial transmit sequences

CLC Number:

TN919.3

GAO Yang,XIANG Binglong,GONG Fengkui. SG-PTS method for PAPR reduction of multi-channel OFDM signals[J].Journal of Xidian University, 2019, 46(5): 128-133.

Figures/Tables 9

References 16

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SG-PTS method for PAPR reduction of multi-channel OFDM signals

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算法	复数加法次数
G-PTS	1 792LN
SG-PTS	134LN