限幅SLM算法降低DD-OFDM系统PAPR的.pdf
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限幅SLM 算法降低DD-OFDM 系统PAPR 的研究
姚超,童峥嵘,曹 晔,杨秀峰
天津理工大学计算机与通信工程学院 天津
( , 300384 )
摘要:提出了限幅SLM(Sel ect ed Mappi ng)算法降低直接检测光正交频分复用系统(DD- OFDM)的峰均
功率比(peak- t o- aver age power r at i o, PAPR)。SLM算法降低了PAPR 出现的概率,但并不能完全限制
高PAPR。限幅SLM算法在传统SLM算法基础上对高PAPR 信号进行限幅运算,进而将PAPR 控制在所需要
的范围内,相对限幅算法又改善了系统误码率性能。该算法可以控制高PAPR,进而降低光信号的功率,其
有效性在DD- OFDM系统信道仿真中得到证实。
关键词 直接检测光正交频分复用;峰均功率比;SLM算法;限幅算法
:
中图分类号 TN 919 文献标识码A 文章编号
: : :1002-5561(2012)01-0032-03
The research on reducing the PAPR of
DD-OFDM with clipping SLM algorithm
YAO Chao,TONG Zheng-rong ,CAO Ye ,YANG Xiu-feng
(School of Computer and Communication Engineering,
Tianjin University of Technology,Tianjin 300384,China)
Abstract:A clipping SLM algorithm is proposed to reduce the peak-to-average power ratio (PAPR) in Di-
rect-Detection Optical Orthogonal Frequency Division Multiplexing (DD-OFDM) system in this paper. Select-
ed Mapping (SLM) algorithm reduces the probability of PAPR, but it cant completely restrain the high power
signal. Clipping SLM algorithm clips the high PAPR based on the traditional SLM algorithm, then it controls
the PAPR within expected range, and it improves the BER of the system. The clipping SLM algorithm con-
trols the PAPR well and then reduces the power of the light signal. And the new method is verified in the fiber
channel simulation of DD-OFDM.
Key words: DD-OFDM; PAPR; SLM algorithm; clipping algorithm
换光纤通信网所期待的 但是同无线信道中的
0 引言 。 OFDM
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