Abstract
In this paper, we investigate the use of layered space-time (also known as the vertical Bell Laboratories layered space-time (V-BLAST) scheme) for multiuser detection in fading channels. The multiple transmit antennas in V-BLAST are treated as individual mobile station transmitters, while the base station consists of multiple receive antennas. In the proposed system, users are organized in groups and allocated a unique spreading code within the same group. Using these codes, we are able to separate the different groups, and layered space-time algorithm is then invoked to further remove the remaining interference between users. A decorrelator-type receiver-based layered space-time detection is proposed for both complex and real constellations. For the latter case, we derive our receiver after evaluating and comparing the performance of two decorrelators based on the V-BLAST scheme. It is demonstrated that a significant performance improvement and increase in system capacity is obtained with very low spreading factors. Further results are also introduced by considering reduced complexity receivers based on serial layered space-time group multiuser detection, and parallel layered space-time group multiuser detection.
| Original language | English |
|---|---|
| Pages (from-to) | 653-658 |
| Number of pages | 6 |
| Journal | IEEE Transactions on Wireless Communications |
| Volume | 2 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Jul 2003 |
| Externally published | Yes |
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Keywords
- Antenna arrays
- Decorrelator-type detectors
- Layered space-time processing
- Multiuser detection
ASJC Scopus subject areas
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering
Cite this
Layered space-time multiuser detection over wireless uplink systems. / Sfar, Sana; Murch, Ross D.; Letaief, Khaled.
In: IEEE Transactions on Wireless Communications, Vol. 2, No. 4, 07.2003, p. 653-658.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Layered space-time multiuser detection over wireless uplink systems
AU - Sfar, Sana
AU - Murch, Ross D.
AU - Letaief, Khaled
PY - 2003/7
Y1 - 2003/7
N2 - In this paper, we investigate the use of layered space-time (also known as the vertical Bell Laboratories layered space-time (V-BLAST) scheme) for multiuser detection in fading channels. The multiple transmit antennas in V-BLAST are treated as individual mobile station transmitters, while the base station consists of multiple receive antennas. In the proposed system, users are organized in groups and allocated a unique spreading code within the same group. Using these codes, we are able to separate the different groups, and layered space-time algorithm is then invoked to further remove the remaining interference between users. A decorrelator-type receiver-based layered space-time detection is proposed for both complex and real constellations. For the latter case, we derive our receiver after evaluating and comparing the performance of two decorrelators based on the V-BLAST scheme. It is demonstrated that a significant performance improvement and increase in system capacity is obtained with very low spreading factors. Further results are also introduced by considering reduced complexity receivers based on serial layered space-time group multiuser detection, and parallel layered space-time group multiuser detection.
AB - In this paper, we investigate the use of layered space-time (also known as the vertical Bell Laboratories layered space-time (V-BLAST) scheme) for multiuser detection in fading channels. The multiple transmit antennas in V-BLAST are treated as individual mobile station transmitters, while the base station consists of multiple receive antennas. In the proposed system, users are organized in groups and allocated a unique spreading code within the same group. Using these codes, we are able to separate the different groups, and layered space-time algorithm is then invoked to further remove the remaining interference between users. A decorrelator-type receiver-based layered space-time detection is proposed for both complex and real constellations. For the latter case, we derive our receiver after evaluating and comparing the performance of two decorrelators based on the V-BLAST scheme. It is demonstrated that a significant performance improvement and increase in system capacity is obtained with very low spreading factors. Further results are also introduced by considering reduced complexity receivers based on serial layered space-time group multiuser detection, and parallel layered space-time group multiuser detection.
KW - Antenna arrays
KW - Decorrelator-type detectors
KW - Layered space-time processing
KW - Multiuser detection
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U2 - 10.1109/TWC.2003.814337
DO - 10.1109/TWC.2003.814337
M3 - Article
VL - 2
SP - 653
EP - 658
JO - IEEE Transactions on Wireless Communications
JF - IEEE Transactions on Wireless Communications
SN - 1536-1276
IS - 4
ER -