基于DHT的光OFDM系统PAPR抑制算法

PAPR reduction algorithm for optical OFDM systems based on discrete Hartley transform

针对光OFDM系统存在高峰均功率比(PAPR),提出了一种基于离散哈特利变换(DHT)的选择映射抑制算法。采用快速哈特利逆变换(IFHT)代替传统的快速傅立叶逆变换(IFFT)和Hermi t i an对称算法,并结合非对称限幅法产生满足光OFDM系统要求的正、实值信号送入光纤信道。

In order to reduce the PAPR in optical Orthogonal Frequency Division Multiplexing （OFDM） sys- tems, Selective Mapping （SLM） technique based on discrete Hartley transform is proposed in this paper. The main idea of the algorithm is to replace the inverse fast Fourier transform （1FFT） with the inverse fast Hartley transform （IFHT） and Hermitian symmetry in each subbolck to make the real baseband signal, and combined with the asymmetrically clipping technique to achieve the positive signal in optical OFDM systems.