基于信号分解降低OFDM信号峰均比的优化建模
PDF下载 (378)赵澄澄,刘太君,叶焱.基于信号分解降低OFDM信号峰均比的优化建模[J].宁波大学学报(理工版),2014,27(03):50-54.DOI:
ZHAO Cheng-cheng,LIU Tai-jun*,YE Yan.PAR Reduction in OFDM Based on Signal Decomposition Through Optimization Programming[J].Journal of Ningbo University(Natural Science & Engineering Edition),2014,27(03):50-54.DOI:
| Title: | PAR Reduction in OFDM Based on Signal Decomposition Through Optimization Programming |
| 作者: | 赵澄澄, 刘太君, 叶焱 |
| Author(s): | ZHAO Cheng-cheng, LIU Tai-jun*, YE Yan |
| 关键词: | 正交频分复用; 峰均比; 误差向量幅度; 最优化方法 |
| Keywords: | orthogonal frequency division multiplexing; peak to average power ratio; error vector magnitude; optimization method |
| 分类号: | TN919.3 |
| 文献标识码: | A |
| 摘要: | 针对正交频分复用(OFDM)系统时域信号具有较高峰均比(PAR)的特点, 提出一种新的减小PAR方法. 首先经过削峰处理削去幅度大于阈值的信号, 然后利用信号分解理论对OFDM削峰信号进行分解, 从有用信号中分离出噪声, 最后通过限定信号幅度阈值和频谱发射模板来建立误差向量幅度(EVM)优化模型. 计算机仿真实验结果表明: 新方法在性能上优于传统的非优化建模方法; 且与已有的PAR减小优化模型相比, 新方法在减小计算复杂度的同时还保持了与已有文献中提出的优化模型的性能. |
| Abstract: | In this paper, we propose a new method for reducing the high time-domain peak to average power ratio (PAR) of orthogonal frequency division multiplexing (OFDM) signals. First, simple hard limited clipping is used to reduce PAR of a signal by limiting the magnitude of the signal to a threshold value. Then, in order to separate noises form useful signals, we use signal decomposition theory to decompose clipped OFDM signals. Finally, we formulate the problem into an Error Vector Magnitude (EVM) optimization model subject to a deterministic amplitude threshold constraint and spectral mask constraint. Simulation results show that the new method is superior in performance to the traditional non-optimized modeling method. Compared with the existing optimization model, the computational complexity of the proposed method is lower at the expense of insignificant performance degradation |
| 参考文献 /References: | [1].Jiang Tao, Wu Yiyan. An overview peak to average power ratio reduction techniques for OFDM signals[J]. IEEE Transactions on Broadcasting, 2008, 54(2):257-268. [2].Han S H, Lee J H. An overview of peak-to-average power ratio reduction techniques for multicarrier transmission[J]. IEEE Wireless Communications, 2005, 12(2):56-65. [3].Kulkarni V M, Bhalchandra A S. An overview of various techniques to reduce the peak-to-average power ratio in multicarrier transmission systems[C]. 2012 IEEE International Conference on ICCIC, 2012:1-5. [4].Wang Luqing, Tellambura C. A simplified clipping and filtering technique for PAR reduction in OFDM systems [J]. IEEE Signal Processing Letters, 2005, 12(6):453-456. [5].Armstrong J. Peak-to-average power reduction for OFDM by repeated clipping and frequency domain filtering[J]. Electronics Letters, 2002, 38(5):246-246. [6].Kitaek B, Andrews J G, Powers E J. Quantifying an iterative clipping and filtering technique for reducing PAR in OFDM[J]. IEEE Transactions on Wireless Com- munications, 2010, 9(5):1558-1563. [7].Baxley R J, Zhao Chunming, Zhou G. Constrained clipping for crest factor reduction in OFDM[J]. IEEE Transactions on Broadcasting, 2006, 52(4):570-575. [8].Luo Zhi Quan, Yu Wei. An introduction to convex optimization for communications and signal processing[J]. IEEE Journal on Selected Areas in Communications, 2006, 24(8):1426-1438. [9].Wang Y C, Yi K C. Convex optimization method for quasi-constant peak-to-average power ratio of OFDM signals[J]. IEEE Signal Processing Letters, 2009, 16(6): 509-512. [10].Aggarwal A, Meng T H. Minimizing the peak-to-average power ratio of OFDM signals using convex optimization [J]. IEEE Transactions on Signal Processing, 2006, 54(8): 3099-3110. [11].Wang Y C, Luo Z Q, optimized iterative clipping and filtering for PAPR reduction of OFDM signals[J]. IEEE Transactions on Communications, 2011, 59(1):33-37. [12].Liu Qijia, Baxley R J, Ma Xiaoli, et al. error vector magnitude optimization for OFDM systems with a deterministic peak to average power ratio constraint[J]. IEEE Journal of Selected Topics in Signal Processing, 2009, 3(3):418-429. |
| 备注/Memo: | 收稿日期: 2013?09?23. 宁波大学学报（理工版）网址: http://journallg.nbu.edu.cn/ 基金项目: 国家自然科学基金（61171040）; 浙江省重大专项重点国际合作项目（2010C14007）; 浙江省自然科学基金（Y1101270）. 第一作者: 赵澄澄（1989－）, 男, 浙江宁波人, 在读硕士研究生, 主要研究方向: 射频功放线性化. E-mail: 891026892@qq.com *通信作者: 刘太君（1965－）, 男, 四川绵阳人, 教授, 主要研究方向: 射频功放建模和线性化. E-mail: liutaijun@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
