降低OFDM信号PAPR的低复杂度PTS方法

doi:10.3969/j.issn.1001-2400.2010.02.026

摘要/Abstract

摘要：

为了改善正交频分复用(OFDM)信号的峰均比(PAPR)性能，提出了一种低复杂度部分传输序列(PTS)方法．首先通过分析备选信号的特点，需要搜索的相位因子向量个数从64减少到16而没有峰均比(PAPR)性能的损失，从而减少了相位因子搜索时间．然后采用分组的概念，重新分配旋转因子乘法的操作时间，使用基于路径的常数乘法器代替复数乘法器，从而降低硬件消耗．与4个完整的基2³单路径延迟反馈IFFT相比，文中的IFFT单元的复数乘法器、复数加法器和寄存器的硬件消耗分别降低了58.8％，28.6％和75.6％，并且，不需要ROM存储旋转因子．此外，由于所需相位因子向量的特点，PAPR优化单元中的硬件消耗能够被进一步降低．

关键词: 正交频分复用, 峰均比, 部分传输序列法, 低复杂度

Abstract:

A low complexity partial transmit sequence (PTS) scheme is proposed to improve the performance of the peak-to-average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) signals. By analyzing the characteristic of candidate signals, the number of phase factor vectors is reduced from 64 to 16 without the loss of PAPR performance and the search time of the phase factor is reduced. The hardware cost of the IFFT unit can be reduced by adopting the group concept, rescheduling the time of the multiplication with twiddle factors, and using path-based constant multipliers instead of complex multipliers. In the IFFT unit, the hardware costs of complex multipliers, complex adders, and registers are respectively reduced by 58.8％, 28.6％, and 75.6％ compared with four independent IFFT processors with radix 23 and single-path delay feedback. In addition, there is no need for ROM to store the twiddle factor. Moreover, because of the characteristic of the needed phase factor vectors, the hardware overhead of the optimization unit can be lessened.

Key words: orthogonal frequency division multiplexing (OFDM), peak-to-average power ratio (PAPR), partial transmit sequence (PTS), low complexity

王进祥;吴新春;毛志刚;周彬. 降低OFDM信号PAPR的低复杂度PTS方法[J]. J4, 2010, 37(2): 326-333.

WANG Jin-xiang;WU Xin-chun;MAO Zhi-gang;ZHOU Bin. Low complexity PTS scheme for PAPR reduction of OFDM signals[J]. J4, 2010, 37(2): 326-333.

参考文献

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