Improvement in the Spread Spectrum System in DSSS, FHSS, AND CDMA
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Authors
Ponuratinam, Gowrilakshmi
Patel, Bhumika
Rizvi, Syed S.
Elleithy, Khaled M.
Issue Date
2009-04-03
Type
Article
Language
en_US
Keywords
Engineering , Signal jamming
Alternative Title
Abstract
In this paper, we introduce spread spectrum links that can be used to overcome intentional jamming. The problem of communicating in the presence of jamming is very much akin to the problem of communicating over fading channels. Hence, by finding out how to defeat jamming by spread spectrum will also reveal how to overcome fading. Today, spread spectrum links are also used in many civilian systems to overcome non-intentional jamming (or interference), and the report is concluded with an overview of current commercial spread spectrum systems. In addition to the traditional coherent spread-spectrum systems, the definition of an ideal modified version is introduced and this model is analyzed from an information theoretic viewpoint. The project uses a simple point-to-point communication system with fully synchronized transmitter and receiver in a simple channel with white Gaussian noise and arbitrary jamming signal. We prove that in traditional systems the channel converges to a Gaussian noisy channel in the limit in the case of almost any jamming signal, and in our new ideal modified system the channel converges to a white Gaussian noisy channel in the limit in the case of any jamming signal when the processing gain goes to infinity.
Description
© ASEE 2009
Citation
Publisher
ASEE