Performance of DS receiver code acquisition using matched filters and median filters in continuous tone jamming

This paper introduces the analysis and simulation results of a DS spread spectrum system in which the principle of matched filter synchronization for acquisition of code synchronization is used. Upper bounds (due to the upper bound of P_d) of mean acquisition time of coherent matched filter synchronization in continuous tone jamming, when complementary codes are used as the spreading codes, are indicated. The idea of using median type filtering as an aiding device for the matched filter is presented. It is shown that continuous jamming can have a very dramatic influence on mean acquisition time if the imbalances of the codes have large values, but the influence is totally eliminated by using a median filter