Constant Envelope OFDM

Author

Thompson, Steve C. ; Ahmed, Ahsen U. ; Proakis, John G. ; Zeidler, James R. ; Geile, Michael J.

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of California, La Jolla, CA

Volume

56

Issue

8

fYear

2008

fDate

8/1/2008 12:00:00 AM

Firstpage

1300

Lastpage

1312

Abstract

This paper describes a transformation technique aimed at solving the peak-to-average power ratio (PAPR) problem associated with OFDM (orthogonal frequency-division multiplexing). Constant envelope OFDM (CE-OFDM) transforms the OFDM signal, by way of phase modulation, to a signal designed for efficient power amplification. At the receiver, the inverse transformation - phase demodulation - is applied prior to the conventional OFDM demodulator. The performance of CE-OFDM is analyzed in additive white Gaussian noise (AWGN) and fading channels. CE-OFDM is shown to achieve good performance in dense multipath with the use of cyclic prefix transmission in conjunction with a frequency- domain equalizer (FDE). By way of computer simulation and hardware realization, CE-OFDM is shown to compare favorably to conventional OFDM.

Keywords

AWGN channels; OFDM modulation; equalisers; fading channels; frequency-domain analysis; multipath channels; phase modulation; AWGN channels; FDE; PAPR; additive white Gaussian noise channels; constant envelope OFDM; fading channels; frequency-domain equalizer; inverse transformation; multipath channels; orthogonal frequency-division multiplexing; peak-to-average power ratio problem; phase modulation; power amplification; receiver; AWGN; Additive white noise; Demodulation; Fading; Frequency division multiplexing; OFDM; Peak to average power ratio; Performance analysis; Phase modulation; Signal design;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/TCOMM.2008.070043

Filename

4600180