We consider a direct-sequence spread-spectrum system operating in an indoors environment in the presence of multiaccess and multipath interference, and additive white Gaussian noise. We focus on the worst-case bit error probability of this system with a constraint on signal-to-interference ratio, and derive a Chernoff-type upper bound on this error probability. We evaluate the upper bound for a special case in order to gain understanding of the basic worst-case performance. We also compare the effects of the worst-case multipath interference with those of the worst-case multiuser interference of equivalent noise power, and observe that the worst-case performance under multipath interference is very similar to and only slightly worse than that under multiuser interference. We find out that the worst-case performance can be very good for a large number of chips per bit, whereas it is very poor for a smaller number of chips per bit, and for non-spread-spectrum systems.
A Worst-Case Analysis of Direct-Sequence Spread-Spectrum in Multipath ChannelsJournal of the Franklin Institute-Engineering and Applied Mathematics
Publisher's StatementNOTICE: this is the author’s version of a work that was accepted for publication in Journal of the Franklin Institute-Engineering and Applied Mathematics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of the Franklin Institute-Engineering and Applied Mathematics, 336, 4, (05-01-1999); 10.1016/S0016-0032(97)00078-1
Citation InformationHizlan, M., , & Liu, X. (1999). A worst-case analysis of direct-sequence spread-spectrum in multipath channels. Journal of The Franklin Institute, 336(4), 611-625.