Analyzing spectral regrowth of QPSK and OQPSK signals

Author

Raich, Raviv ; Zhou, G. Tong

Author_Institution

Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA

Volume

4

fYear

2001

fDate

2001

Firstpage

2673

Abstract

A comparison is made between the spectral regrowth of quadrature phase shift keyed (QPSK) and offset QPSK (OQPSK) signals as they go through nonlinear amplifications. Contrary to existing approaches that assume the power amplifier input is Gaussian, our analysis is carried out without the Gaussian assumption, by using higher-order statistics. We show that it is possible to assess quantitatively whether and how much OQPSK is beneficial in reducing spectral regrowth. Simple closed form formulas are obtained when the pulse shape filter is time-limited. A particular measure of spectral broadening is also provided

Keywords

UHF power amplifiers; digital radio; higher order statistics; mobile radio; nonlinear filters; pulse shaping; quadrature phase shift keying; spectral analysis; IS-95; OQPSK; closed form formulas; higher-order statistics; nonlinear amplification; offset QPSK; power amplifier; quadrature phase shift keying; spectral broadening; spectral regrowth; time-limited pulse shape filter; Filters; High power amplifiers; Higher order statistics; Particle measurements; Pulse amplifiers; Pulse shaping methods; Quadrature phase shift keying; Shape; Signal analysis; Spectral analysis;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 2001. Proceedings. (ICASSP '01). 2001 IEEE International Conference on

Conference_Location

Salt Lake City, UT

ISSN

1520-6149

Print_ISBN

0-7803-7041-4

Type

conf

DOI

10.1109/ICASSP.2001.940552

Filename

940552