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| 针对DTMB-A系统的自适应峰均比降低算法 |
梁林峰1,王军1,宋健1,2( ) |
| 2. 数字电视国家工程实验室(北京), 北京100191 |
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| Adaptive peak-to-average power ratio reduction algorithm for DTMB-A systems |
| Linfeng LIANG1,Jun WANG1,Jian SONG1,2() |
1. Tsinghua National Laboratory for Information Science and Technology, Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
2. National Engineering Laboratory for Digital Television (Beijing), Beijing 100191, China |
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摘要针对地面数字多媒体广播演进方案(DTMB-A)中由于采用了较大FFT长度而带来的高峰均比问题,提出一种基于动态星座图扩展的自适应峰均比降低算法。首先介绍了针对APSK调制方式的动态星座图扩展算法,明确了星座点可扩展区域的选择方式; 随后基于峰值抵消信号推导了动态星座图扩展算法的最优时域系数; 最后针对现有动态星座图扩展算法对初始限幅门限值敏感的问题,提出一种在迭代中自适应调整限幅门限值的方法。仿真结果表明: 所提算法的降峰均比性能优于现有动态星座图扩展算法,同时在初始限幅门限值设置不理想的情况下具有较好的鲁棒性。
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| 关键词 ：地面数字多媒体广播演进方案,峰均比,动态星座图扩展,正交频分复用 |
Abstract：This paper describes an adaptive peak-to-average power ratio (PAPR) reduction algorithm using the active constellation extension (ACE) for DTMB-A systems with large FFT lengths. The implementation of ACE algorithm for APSK constellation is introduced with the feasible extension region for the APSK constellation. An optimal time-domain factor for the ACE algorithm is then given based on the peak-cancellation signal. Since the original active constellation extension is sensitive to the initial clipping threshold, a method is given to adaptively adjust the clipping threshold. Simulations show that the algorithm has better performance than the original algorithms and is more robust to the initial clipping threshold.
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| Key words：digital terrestrial multimedia broadcast advanced (DTMB-A)peak-to-average power ratio (PAPR)active constellation extension (ACE)orthogonal frequency division multiplexing (OFDM) |
| 收稿日期: 2013-08-09 出版日期: 2015-04-16 |
| 基金资助:国家自然科学基金创新研究群体项目(61021001);国家 “八六三” 高技术项目(2012AA011704) |
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