Research Article
Successive interference cancelation and strongest users detectors for randomly spread DS-CDMA
@INPROCEEDINGS{10.1109/CROWNCOM.2009.5189049, author={Avi Steiner and Shlomo Shamai and Uri Katz and Valentin Lupu}, title={Successive interference cancelation and strongest users detectors for randomly spread DS-CDMA}, proceedings={4th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications}, publisher={IEEE}, proceedings_a={CROWNCOM}, year={2009}, month={8}, keywords={}, doi={10.1109/CROWNCOM.2009.5189049} }- Avi Steiner
Shlomo Shamai
Uri Katz
Valentin Lupu
Year: 2009
Successive interference cancelation and strongest users detectors for randomly spread DS-CDMA
CROWNCOM
IEEE
DOI: 10.1109/CROWNCOM.2009.5189049
Abstract
We consider here the problem of multi-user detection for randomly spread direct-sequence (DS) coded-division multiple access (CDMA) over flat fading channels. The analysis is focused on the case of many users, and large spreading sequences such that their ratio, which is the system load, is kept fixed. Spectral efficiency of practical linear detectors such as match-filter and decorrelator employing successive interference cancellation (SIC) at the receiver is derived. This is used to extend the notion of strongest users detectors for SIC receivers. The strongest users detectors system design relies on an outage approach where each user transmits in a single layer (fixed rate). This constraint is relaxed here, and the concept is combined with a broadcast approach, providing higher achievable rates.