Multiuser Detection in DSSS Systems
Author | : Shahzadi Mahnoor |
Publisher | : LAP Lambert Academic Publishing |
Total Pages | : 72 |
Release | : 2014-05-28 |
ISBN-10 | : 3659541176 |
ISBN-13 | : 9783659541179 |
Rating | : 4/5 (179 Downloads) |
Download or read book Multiuser Detection in DSSS Systems written by Shahzadi Mahnoor and published by LAP Lambert Academic Publishing. This book was released on 2014-05-28 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Direct sequence code division multiple access (DS-CDMA) is a popular wireless technology in DS-CDMA communications, all of the users' signal overlap in time and frequency and cause mutual interference. The capacity of Direct Sequence Code Division Multiple Access (DS-CDMA) is limited by Multiple Access Interference (MAI) instead of thermal noise. Commercial CDMA systems such as the ones based on IS-95 standard regard MAI as additive noise and employ matched filter detectors. This technique limits the number of users that can be supported in DS-CDMA system to less than 10% of the spreading gain. Moreover the bit error rates for individual users degrade rapidly with an increase in number of users. The conventional DS-CDMA detector follows single user detection strategy in which each user is detected separately without regard for the other users. A better strategy is multi-user detection, where information about multiple users is used to improve detection of each individual user. A number of important multiuser detectors have been proposed here. The content of the book is in following sequence.