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
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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