Applications of Transform Domain Processing to the Reception and Detection of Spread Spectrum Signals.

摘要

Spread spectrum communications topics fundamental to the successful operation of an overall system are discussed. System performance can be significantly enhanced by the incorporation of the transform domain processing techniques described below. The following key topics have been studied. i). A transform domain processing intercept receiver is implemented for detection of direct sequence BPSK signals in the presence of finite bandwidth interference using an adaptive interference rejection technique. The receiver performs a real-time Fourier transformation followed by one of two interference rejection techniques. ii) During the process of acquisition, a spread spectrum system is at its most vulnerable stage, since it has no processing gain working in its favor. An analytical expression for the probability of error has been obtained for the case when a sinusoidal interferer is present, and numerical results have been generated to illustrate the sensitivity of the system to various parameters. iii) Some experimental work has been performed in conjunction with a novel synchronization and PN code acquisition technique employing transform domain processing for a DS spread spectrum communication receiver. (jhd)