Reduction of peak-to-average power ratio of OFDM system using a companding technique

Author

Wang, Xianbin ; Tjhung, T.T. ; Ng, C.S.

Author_Institution

Dept. of Electr. Eng., Nat. Univ. of Singapore, Singapore

Volume

45

Issue

3

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

303

Lastpage

307

Abstract

A companding technique is proposed to reduce the peak-to-average-power ratio of the orthogonal frequency division multiplexing (OFDM) signal in this paper. The probability density function of the amplitude of the OFDM signal is determined. Because of the Gaussian distribution of the OFDM signal, the companding technique can be quite effective, since a large OFDM signal only occurs infrequently. The peak-to-average power ratio of an OFDM system and the optimal companding coefficient are determined in this paper. The symbol error rate of the systems after the companding is derived. The performances of the system with and without the companding are also compared

Keywords

Gaussian distribution; OFDM modulation; compandors; digital television; error statistics; Gaussian distribution; OFDM system; amplitude; companding technique; orthogonal frequency division multiplexing; peak-to-average power ratio; performance; probability density function; symbol error rate; Analog-digital conversion; Digital modulation; Error analysis; Gaussian distribution; OFDM modulation; Peak to average power ratio; Probability density function; Quantization; Speech; Student members;

fLanguage

English

Journal_Title

Broadcasting, IEEE Transactions on

Publisher

ieee

ISSN

0018-9316

Type

jour

DOI

10.1109/11.796272

Filename

796272