Curve Fitting Based Piecewise Nonlinear Companding Scheme for PAPR Reduction in OFDM Systems

被引：3
|
作者：
Xing, Zhitong [1 ]
Li, Yun [2 ]
Peng, Deyi [1 ]
Xia, Shichao [2 ]
机构：
[1] Chongqing Univ Post & Telecommun, Sch Commun & Informat Engn, Chongqing Key Lab Mobile Commun Technol, Chongqing 400065, Peoples R China
[2] Chongqing Univ Post & Telecommun, Sch Software Engn, Chongqing 400065, Peoples R China
来源：
IEEE COMMUNICATIONS LETTERS | 2023年 / 27卷 / 02期
基金：
中国国家自然科学基金;
关键词：
OFDM; PAPR; companding; BER; PSD; TRANSFORM;
D O I：
10.1109/LCOMM.2022.3228938
中图分类号：
TN [电子技术、通信技术];
学科分类号：
0809 ;
摘要：
Peak-to-average power ratio (PAPR) is an important issue for orthogonal frequency division multiplexing (OFDM) systems. In this letter, we derive a new piecewise nonlinear companding scheme for reducing PAPR in OFDM systems. Compared with current state-of-art companding scheme, the new companding scheme improves the power spectral density (PSD) performance. The companding function is derived according to the cumulative distribution function (CDF) of companded OFDM signals' amplitudes, which is fitted by using several piecewise linear functions to approximate the original Rayleigh distribution CDF. The constraint optimization problem is formulated, and parameter selection method is provided. Simulation results verify that under precondition of similar PAPR reduction levels, the proposed companding scheme could achieve better bit error rate (BER) and PSD performance compared with other typical companding schemes.
引用
收藏
页码：681 / 685
页数：5
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