Accession Number:

ADA231290

Title:

Excision Techniques in Direct Sequence Spread Spectrum Communication Systems

Descriptive Note:

Corporate Author:

DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)

Personal Author(s):

Report Date:

1990-11-01

Pagination or Media Count:

80.0

Abstract:

This report presents a comprehensive summary of a number of methods used in filtering narrowband jammers and interference out of direct sequence spread spectrum communication systems. The basic concept is presented first followed by a discussion of several analog techniques for interference suppression. Most of the emphasis is on digital adaptive methods, which rely on adaptive filtering algorithms. Many of these algorithms are highlighted. This is followed by a discussion on the research which has been conducted in digital excision over the past several years. Two cases based on the authors work are also presented. The first details the performance one can expect from the recursive least squares algorithm when the interferer is a stable tone. An analytical model, which predicts the bit error rate performance for the recursive algorithm under certain conditions, is derived. This model is compared to results obtained from computer simulation, the tracking and filtering capabilities of hte block and recursive least square algorithms when the interference is of the FM-type, i.e., a swept tone having a bandwidth which is approximately 20 of the chip rate. Author

Subject Categories:

  • Magnetic and Electric Field Detection and Detectors
  • Command, Control and Communications Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE