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Median-prefiltering-based robust acquisition of direct-sequence spread spectrum signals in wide-band pulse jamming
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- Authors
- Issue Date
- 2002-01
- Citation
- IEEE Transactions on Vehicular Technology, vol. 51, no.1, pp. 171-197, January 2002
- Keywords
- Median filter ; robust acquisition ; spread spectrum ; wide-band 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.
- ISSN
- 0018-9545
- Language
- English
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