Cochannel uplink interference in PN spread QPSK satellite systems

Document Type

Conference Proceeding

Publication Date

1-1-1992

Abstract

The effect of a bandpass limiter in code division multiple access quadriphase shift keying (QPSK) satellite spread spectrum communication systems is investigated. The case of a cochannel interferer on the uplink is analyzed in detail. The nonlinear characteristics of the bandpass limiter result in the generation of intermodulation products which become narrowband signals after the despreading process in the spread spectrum receiver. These intermodulation products and the cochannel interference affect system performance. The assumptions made in deriving the theoretical performance of the system were checked by simulating the entire system using the Block Oriented Systems Simulator (BOSS) software package. The results of the simulation show good agreement with the theoretical calculations, within 1 to 2 dB in signal-to-noise ratio. In addition, by means of simulation, it was possible to explore some features of the system that could not be addressed analytically, such as the effect of processing gain and unbalanced codes on system performance.

Identifier

85067183145 (Scopus)

ISBN

[078030585X]

Publication Title

Proceedings IEEE Military Communications Conference MILCOM

External Full Text Location

https://doi.org/10.1109/MILCOM.1992.244105

First Page

1158

Last Page

1162

Volume

1992-October

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