A worst-case analysis of direct-sequence spread-spectrum in multipath channels

✍ Scribed by Murad Hizlan; Xuedong Liu

• Book ID: 104134941
• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 594 KB
• Volume: 336
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(97)00078-1

✦ Synopsis

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-tointerference 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 worstcase 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.