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

摘要/Abstract

摘要：

由于多路正交频分复用信号是由多个不同频带的正交频分复用信号叠加而成的,其信号峰均比过大的问题较之单路正交频分复用信号更为严重, 并且针对单路正交频分复用信号的降峰均比算法难以适用于多路正交频分复用系统,因此提出了分组部分传输序列算法和简化分组部分传输序列算法。这两种算法首先将多路正交频分复用信号进行分组并将组内信号相加,继而将相加得到的信号分别乘以一个相位旋转因子后再次相加,通过选择最优的相位旋转因子组合来降低信号的峰均比。另外,与分组部分传输序列算法相比,简化分组部分传输序列算法可以进一步降低寻找最优相位旋转因子组合的计算复杂度。仿真结果表明,简化分组部分传输序列算法能有效地抑制多路正交频分复用信号的峰均比且实现复杂度适中。因此,提出的降信号峰均比算法更适用于实际的多路正交频分复用系统。

关键词: 正交频分复用, 峰均比, 部分传输序列

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

中图分类号:

TN919.3

高洋,项炳龙,宫丰奎. 一种抑制多路OFDM信号峰均比的SG-PTS算法[J]. 西安电子科技大学学报, 2019, 46(5): 128-133.

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.

图/表 9

图1

图2

图3

图4

图5

表1

图6

图7

图8

参考文献 16

[1]	PARK H, LEE H H, LEE S H . IEEE 802 Standardization on Heterogeneous Network Interworking[C]// Proceedings of the 2014 International Conference on Advanced Communication Technology. Piscataway: IEEE, 2014: 1140-1145.
[2]	PETERS S W, HEATH R W . The Future of Wimax: Multihop Relaying with IEEE 802.16[J]. IEEE Communications Magazine, 2009,47:104-111.
[3]	HOLMA H, TOSKALA A . LTE-advanced: 3GPP Solution for IMT-advanced[M]. Hoboken: Wiley, 2012.
[4]	JIANG Y . New Companding Transform for PAPR Reduction in OFDM[J]. IEEE Communications Letters, 2010,14(4):282-284.
[5]	WANG C L, WANG S S, CHEN H M . An Improved Metric-based Active Constellation Extension Scheme for PAPR Reduction in OFDM Systems[C]// Proceedings of the 2016 Wireless Telecommunications Symposium. Washington: IEEE Computer Society, 2016: 7482033.
[6]	ZHONG J, YANG X, HU W . Performance-improved Secure OFDM Transmission Using Chaotic Active Constellation Extension[J]. IEEE Photonics Technology Letters, 2017,29(12):991-994.
[7]	KASHYAP P, THAKUR K . Improved ACE Method for Reducing PAPR in OFDM System[C]// Proceedings of the 2018 International Conference on Inventive Communication and Computational Technologies. Piscataway: IEEE, 2018: 402-406.
[8]	QI X, LI Y, HUANG H . A Low Complexity PTS Scheme Based on Tree for PAPR Reduction[J]. IEEE Communications Letters, 2012,16(9):1486-1488.
[9]	温鸿航, 葛建华, 许唐雯 . 一种低复杂度OFDM峰均比降低方法[J]. 西安电子科技大学学报, 2015,42(5):188-193.
	WEN Honghang, GE Jianhua, XU Tangwen . Low Complexity Method for PAPR Reduction of OFDM Signals[J]. Journal of Xidian University, 2015,42(5):188-193.
[10]	JI J, ZHANG C, ZHU W J . Low-complexity PTS Scheme Based on Phase Factor Sequences Optimization[J]. Journal of Systems Engineering and Electronics, 2018,29(4):707-713.
[11]	PARK D C, KIM S C . Partial Transmit Sequence Scheme for Envelope Fluctuation Reduction in OFDMA Uplink Systems[J]. IEEE Communications Letters, 2018,22(8):1652-1655.
[12]	RAHMATALLAH Y, MOHAN S . Peak-to-average Power Ratio Reduction in OFDM Systems: a Survey and Taxonomy[J]. IEEE Communications Surveys and Tutorials, 2013,15(4):1567-1592.
[13]	OGUNKOYA F B, POPOOLA W O, SHAHRABI A , et al. Performance Evaluation of Pilot-assisted PAPR Reduction Technique in Optical OFDM Systems[J]. IEEE Photonics Technology Letters, 2015,27(10):1088-1091.
[14]	JAWHAR Y A, AUDAH L, TAHER M A , et al. A Review of Partial Transmit Sequence for PAPR Reduction in the OFDM Systems[J]. IEEE Access, 2019,7:18021-18041.
[15]	HASSAN Y, EL-TARHUNI M . A Comparison of SLM and PTS Peak-to-average Power Ratio Reduction Schemes for OFDM Systems[C]// Proceedings of the 2011 4th International Conference on Modeling, Simulation and Applied Optimization. Washington: IEEE Computer Society, 2011: 5775529.
[16]	SIMON M K, ALOUINI M S . Digital Communication over Fading Channels: a Unified Approach to Performance Analysis[M]. Hoboken: Wiley, 2000.