Conference paper
Partial interference subspace rejection in CDMA systems
Previously presented interference subspace rejection (ISR) proposed a family of new efficient multiuser detectors for CDMA. We reconsider in this paper the modes of ISR using decision feedback (DF). DF modes share similarities with parallel interference cancellation (PIC) but attempt to cancel interference by nulling rather than subtraction.
However like the PIC they are prone to wrong tentative decisions. We propose a modification to DF modes that performs partial ISR instead of complete interference cancellation. When tentative decisions are correct, interference is therefore not perfectly rejected anymore. This drawback is compensated by improved robustness to wrong tentative decisions.
We show that in hard handoff systems, partial ISR can only provide negligible performance improvements in high loaded systems outside the region of interest due to out-sector interference. In situations where both in-sector and out-sector interferences are cancelled, as may occur in soft handoff situations, BER performance may improve by more than I dB
| Language: | English |
|---|---|
| Year: | 2001 |
| Pages: | 1809-1813 |
| Proceedings: | IEEE VTS 53rd Vehicular Technology Conference |
| ISBN: | 0780367286 and 9780780367289 |
| ISSN: | 10903038 and 25772465 |
| Types: | Conference paper |
| DOI: | 10.1109/VETECS.2001.945006 |
Additive white noise BER performance Binary phase shift keying Bit error rate CDMA systems Detectors Gaussian noise High definition video Interference cancellation Multiaccess communication Sensor arrays Signal mapping cellular radio cellular system code division multiple access decision feedback modes error statistics hard handoff in-sector interferences interference cancellation interference suppression multiuser detectors out-sector interference parallel interference cancellation partial interference subspace rejection soft handoff tentative decisions
