Layered space-time multiuser detection over wireless uplink systems

Sana Sfar, Ross D. Murch, Khaled Letaief

Research output: Contribution to journalArticle

87 Citations (Scopus)

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 languageEnglish
Pages (from-to)653-658
Number of pages6
JournalIEEE Transactions on Wireless Communications
Volume2
Issue number4
DOIs
Publication statusPublished - Jul 2003
Externally publishedYes

Fingerprint

Multiuser Detection
Multiuser detection
Uplink
Space-time
Antennas
Base stations
Fading channels
Receiver
Transmitters
Vertical
Multiple Antennas
Fading Channels
Transmitter
Antenna
Interference

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 journalArticle

@article{211bd195c6164755a7178a6ce1b96046,
title = "Layered space-time multiuser detection over wireless uplink systems",
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.",
keywords = "Antenna arrays, Decorrelator-type detectors, Layered space-time processing, Multiuser detection",
author = "Sana Sfar and Murch, {Ross D.} and Khaled Letaief",
year = "2003",
month = "7",
doi = "10.1109/TWC.2003.814337",
language = "English",
volume = "2",
pages = "653--658",
journal = "IEEE Transactions on Wireless Communications",
issn = "1536-1276",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "4",

}

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

UR - http://www.scopus.com/inward/record.url?scp=0842327523&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0842327523&partnerID=8YFLogxK

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 -