| 同时含有限幅失真和量化失真的OFDM系统的联合优化 |
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| 作者姓名： | 李占亚 张光荣 陈晓辉 王卫东 |
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| 作者单位： | 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 |
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| 基金项目： | 新一代宽带无线移动通信网科技重大专项（2009ZX03002-015-02）资助 |
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| 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.
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| 关 键 词： | OFDM 限幅失真 量化失真 联合优化 |
| 收稿时间： | 2013-03-26 |
| 修稿时间： | 2013-06-05 |
Joint optimization of the OFDM system simultaneously corrupted by clipping and quantization distortions |
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| Authors: | LI Zhanya ZHANG Guangrong CHEN Xiaohui WANG Weidong |
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| Institution: | Wireless Information Network Laboratory, University of Science and Technology of China, Hefei 230027, China |
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| 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. |
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| Keywords: | OFDM clipping distortion quantization distortion joint optimization |
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