DSSS/MCM system performance in a Doppler spread channel

Author

Welch, Thad B. ; Ziemer, Rodger E.

Author_Institution

US Air Force Academy, Colorado Univ., Colorado Springs, CO, USA

Volume

2

fYear

1997

fDate

2-5 Nov 1997

Firstpage

587

Abstract

There has been a great deal of interest in the use of direct sequence spread spectrum (DS-SS) in combination with multicarrier modulation (MCM). Although the proposed system implementations in the literature vary, all of these systems share the functionality of DS-SS, MCM, and some form of a branch combiner at the receiver. We investigate the performance of such a system transmitting through a Doppler spread channel. In Doppler spread fading, the proposed system performance exhibits an irreducible bit error probability (BEP) even for the single user case. Dramatic performance improvements can be realized with the use of an ideal maximal ratio combiner (MRC). A system utilizing an equal gain combiner (EGC) is analyzed. Finally, we compare the analytic results with the results from several computer simulations

Keywords

Doppler broadening; differential phase shift keying; diversity reception; error statistics; fading; spread spectrum communication; time-varying channels; Doppler spread channel; Doppler spread fading; bit error probability; branch combiner; direct sequence spread spectrum; equal gain combiner; functionality; maximal ratio combiner; multicarrier modulation; performance; receiver; Bandwidth; Differential quadrature phase shift keying; Error probability; Fading; Frequency; Multipath channels; Spread spectrum communication; Springs; System performance; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

MILCOM 97 Proceedings

Conference_Location

Monterey, CA

Print_ISBN

0-7803-4249-6

Type

conf

DOI

10.1109/MILCOM.1997.646689

Filename

646689