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中国科学院大学学报 ›› 2014, Vol. 31 ›› Issue (2): 249-256.DOI: 10.7523/jssn.2095-6134.2014.02.016

• 信息与电子科学 • 上一篇    下一篇

同时含有限幅失真和量化失真的OFDM系统的联合优化

李占亚, 张光荣, 陈晓辉, 王卫东   

  1. 中国科学技术大学无线网络通信安徽省重点实验室, 合肥 230027
  • 收稿日期:2013-03-26 修回日期:2013-06-05 发布日期:2014-03-15
  • 通讯作者: 李占亚,E-mail:lzycs@mail.ustc.edu.cn
  • 基金资助:

    新一代宽带无线移动通信网科技重大专项(2009ZX03002-015-02)资助

Joint optimization of the OFDM system simultaneously corrupted by clipping and quantization distortions

LI Zhanya, ZHANG Guangrong, CHEN Xiaohui, WANG Weidong   

  1. Wireless Information Network Laboratory, University of Science and Technology of China, Hefei 230027, China
  • Received:2013-03-26 Revised:2013-06-05 Published:2014-03-15

摘要:

针对同时含有限幅失真和量化失真的OFDM系统,首次从端到端链路的角度,研究该系统的联合优化问题. 建立了相应的多变量多目标优化模型,并使用NSGA-Ⅱ算法,通过软件仿真给出该优化模型的帕累托前沿面. 仿真结果证明,在USQ位宽为1或2 bit时,该系统可以取得超过5 dB的峰均比增益,而同时损失的平均信道容量却远小于0.1 bps/Hz. 同时给出该系统BER性能的闭合表达式,并使用软件仿真验证了该表达式的正确性.

关键词: OFDM, 限幅失真, 量化失真, 联合优化

Abstract:

We consider the OFDM system simultaneously corrupted by the clipping distortion and quantization distortion. Joint optimization of such an OFDM system from the standpoint of end-to-end link is investigated. The corresponding multi-variable and multi-object optimization models are established and the Pareto front is obtained through software simulation by employing the NSGA-Ⅱ algorithm. Results show that at USQ width of 1 or 2 bit, more than 5dB peak-to-average power ratio gain is achieved while the loss of the average channel capacity is much less than 0.1 bps/Hz. Meanwhile, the theoretical BER of the OFDM system is derived and its accuracy is verified by software simulations.

Key words: OFDM, clipping distortion, quantization distortion, joint optimization

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