Nonlinear Companding Transform Using Hyperbolic Tangent Function in OFDM Systems

Author

Wang, Yannan ; Ge, J.-H. ; Wang, Liang-Hung ; Ai, Bo

Author_Institution

State Key Lab. of Integrated Service Network, Xidian Univ., Xi´´an, China

fYear

2012

fDate

21-23 Sept. 2012

Firstpage

1

Lastpage

4

Abstract

A new nonlinear companding transform (NCT) scheme is proposed to reduce the peak-to-average power ratio (PAPR) of transmitted signals in orthogonal frequency division multiplexing (OFDM) systems. Its companding transfer curve is based on the specified hyperbolic tangent function. By compressing large amplitude signals while enhancing small ones simultaneously, this scheme can obtain an effective reduction of PAPR with a low bit error rate (BER) degradation. A theoretical performance analysis regarding the achievable PAPR reduction and transform gain are provided. Simulations demonstrate the effectiveness and robustness of the proposed scheme.

Keywords

OFDM modulation; error statistics; signal processing; transforms; BER; NCT scheme; OFDM system; PAPR; amplitude signal compression; bit error rate; companding transfer curve; hyperbolic tangent function; nonlinear companding transform scheme; orthogonal frequency division multiplexing; peak-to-average power ratio; robustness; signal enhancement; signal transmission; Bit error rate; Gain; Peak to average power ratio; Phase shift keying; Quadrature amplitude modulation; Transforms;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications, Networking and Mobile Computing (WiCOM), 2012 8th International Conference on

Conference_Location

Shanghai

ISSN

2161-9646

Print_ISBN

978-1-61284-684-2

Type

conf

DOI

10.1109/WiCOM.2012.6478587

Filename

6478587