The effects of delay spread on 2-PSK, 4-PSK, 8-PSK and 16-QAM in a portable radio environment

Author

Chuang, J.C.I.

Author_Institution

Bell Commun. Res., Red Bank, NJ

Volume

38

Issue

2

fYear

1989

fDate

5/1/1989 12:00:00 AM

Firstpage

43

Lastpage

45

Abstract

Computer simulation results are presented of a study of delay spread on digital modulations with different constellations in a quasi-static multipath radio channel. Unfiltered 2-, 4-, and 8-PSK and 16-QAM with a rectangular signaling pulse are compared first, followed by 4- and 16-QAM with a raised-cosine Nyquist pulse. The bit error rate performances averaged over fading samples under the influence of the intersymbol interference caused by delay spread are compared for modulations of different levels. It is found that 4-level modulation is the most desired method for both performance and implementation in a quasistatic, frequency-selective fading radio channel. Both the spectral and the power efficiencies can be enhanced using Nyquist signaling pulses

Keywords

amplitude modulation; delays; fading; mobile radio systems; phase shift keying; radiowave propagation; telecommunication channels; Nyquist signaling pulses; bit error rate performances; computer simulation; delay spread; digital modulations; fading samples; frequency-selective fading radio channel; intersymbol interference; multipath radio channel; portable radio environment; power efficiencies; radiowave propagation; raised-cosine Nyquist pulse; rectangular signaling pulse; spectral efficiency; Amplitude modulation; Bit error rate; Delay effects; Fading; Intersymbol interference; Matched filters; Phase shift keying; Quadrature amplitude modulation; Quadrature phase shift keying; Throughput;

fLanguage

English

Journal_Title

Vehicular Technology, IEEE Transactions on

Publisher

ieee

ISSN

0018-9545

Type

jour

DOI

10.1109/25.61337

Filename

61337