Title :
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
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;
Conference_Titel :
Wireless Communications, Networking and Mobile Computing (WiCOM), 2012 8th International Conference on
Conference_Location :
Shanghai
Print_ISBN :
978-1-61284-684-2
DOI :
10.1109/WiCOM.2012.6478587
