Utilization of Matched Filters in Cochannel Interference Suppression

This paper discusses the use of matched filters in the suppression of cochannel interference. Attention is particularly focused on matched filters which exhibit a large time-bandwidth product (i.e., spread spectrum systems). For these cases, the output signal-to-interference power ratio is determined for any type of interfering signal. The central limit theorem also allows the determination of error probabilities for these cases. In the determination of error probabilities, two receiver configurations have been employed, one a completely linear receiver employing a simple threshold and the other a receiver which uses an envelope detector followed by a threshold decision mechanism. The results of a preliminary investigation of the low-time band-width case have also been discussed and show that smaller amounts of processing gain can also be obtained for this case. A tabulated summary of the gains available for 81 signal and interference cases has been given.