Performance of π/4 SQAM in a hard-limited channel in the presence of AWGN

Author

Palmer, Craig S. ; Feher, Kamilo

Author_Institution

Southwestern Bell Technol. Resources, St. Louis, MO, USA

Volume

39

Issue

2

fYear

1993

fDate

6/1/1993 12:00:00 AM

Firstpage

301

Lastpage

306

Abstract

A strategy that reduces the spectral spreading when an ideal hard-limiter is used as a first approximation to a fully saturated power amplifier is presented. This strategy combines superposed quadrature amplitude modulation (SQAM) filtering with the π/4-shift quadrature phase-shift keying (QPSK) digital transmission format adopted for the first generation of US digital cellular systems. Simulation results showed that this π/4 SQAM filtering strategy increased capacity by 35% in comparison to hard-limited π/4 QPSK. Using computer-aided design, a receive filter that would limit the degradation of E _b/N₀ to less than 1.4 dB at a bit error rate of P_e=10^-4 was selected

Keywords

amplitude modulation; cellular radio; digital radio systems; phase shift keying; random noise; π/4 SQAM; π/4-shift quadrature phase-shift keying; AWGN; QPSK; US digital cellular systems; bit error rate; capacity; degradation; digital filtering; digital transmission format; fully saturated power amplifier; hard-limited channel; ideal hard-limiter; receive filter; spectral spreading; superposed quadrature amplitude modulation; Bit error rate; Computational modeling; Degradation; Design automation; Digital filters; Filtering; Phase shift keying; Power amplifiers; Quadrature amplitude modulation; Quadrature phase shift keying;

fLanguage

English

Journal_Title

Broadcasting, IEEE Transactions on

Publisher

ieee

ISSN

0018-9316

Type

jour

DOI

10.1109/11.218003

Filename

218003