Robust multi-user detector for code division multiple access systems
Code Division Multiple Access (CDMA) has been widely adapted in commercial applications because it increases the capacity of wireless communications systems. It allows multiple users to simultaneously access the same communication resource and transmit information. However, users experience...
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Theses and Dissertations |
| Language: | English |
| Published: |
2015
|
| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/64789 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Code Division Multiple Access (CDMA) has been widely adapted in
commercial applications because it increases the capacity of wireless
communications systems. It allows multiple users to simultaneously access the same
communication resource and transmit information. However, users experience
multiple access interference (MAl) that limits direct sequence COMA (OS-COMA)
system capacity and performance. Efforts must be undertaken to address it
effectively. Multi-user detection is one of the techniques to mitigate the effects of
MAL In this project, existing multi-user detectors in two important classifications,
linear multi-user detectors and subtractive interference cancellation detectors, are
reviewed, and their bit error performance is analyzed using MA TLAB simulations.
Hybrid interference cancellation is then studied to determine its robustness in various
fading environments, which are modeled as Rayleigh and Rician fading channels. It
is concluded that different configurations of hybrid interference cancellation may be
used in DS-COMA systems depending on accuracy of power control of the received
user signals and amount of multipath fading. |
|---|