Median-prefiltering-based robust acquisition of direct-sequence spread-spectrum signals in wide-band pulse jamming

Abstract

We propose robust acquisition schemes for chip time-synchronous direct-sequence spread-spectrum (DS/SS) signals in wide-band pulse jamming. To mitigate the performance degradation due to the impulse-like wide-band jamming signal, the received signal is preprocessed by employing simple order statistic filters. We consider the use of two types of median filtering schemes: a running median filter operating at a chip rate and a block median filter processing the received signal sampled at an oversampling rate. For analytic design, the partial correlation of median filtered pseudonoise (PN) signals is approximated by a piecewise linear model using an upper bound. The analytic design is verified by computer simulation. Finally, the acquisition performance of the proposed schemes is compared to that of conventional schemes.

Accumulation and Elimination: A Hard Decision-Based Multi-User Interference Cancellation Method in Satellite Communication System

“…In reference [10], Choi presented a method to capture weak signals in the presence of strong interference, irrespective of signal power, noise power, and jamming power. In reference [11,12], they considered methods to eliminate narrow-band interference as well as broad-band interference to improve acquisition performance. In reference [13], the proposed algorithm decreases the false alarm probability through the decision of the ratio of the maximum value and the second maximum value of the correlation results.…”