期刊
IEEE COMMUNICATIONS LETTERS
卷 20, 期 12, 页码 2378-2381出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LCOMM.2016.2603529
关键词
Orthogonal frequency division multiplexing (OFDM); peak-to-average power ratio (PAPR); active constellation extension (ACE); convex optimization
资金
- Ministry of Science and Technology, Taiwan [MOST 104-3115-E-110-001, NSC 102-2221-E-110-009-MY3]
The active constellation extension (ACE) scheme provides an effective means of reducing the peak-to-average power ratio (PAPR) without the need for side information. However, traditional ACE schemes involve a time-consuming iteration process. This letter proposes a novel ACE scheme, along with a low-complexity implementation, for orthogonal frequency division multiplexing (OFDM) systems, where the subcarrier grouping technique is adopted to increase the degrees of freedom in the optimization process. The simulation results show that for an OFDM system with 256 subcarriers and 16-ary quadrature amplitude modulation, the proposed scheme achieves a maximum performance gain of 4.3 dB compared with the original OFDM signal given that Prob(PAPR(x) > gamma) = 10(-3).
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