Power control and diversity in feedback communications over a fading channel

Ilkka Saarinen, Aarne Mämmelä

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

Pilot-symbol-assisted modulation system using feedback minimum mean-square error (MMSE) power control in subject to an unavoidable feedback delay, and in conjunction with diversity, is considered over a slow Rayleigh fading channel. Feedback MMSE power control is defined as a power-control function, with feedback MMSE predictions of the current channel fading gains as input that minimizes the system-error probability. The use of feedback requires causality, and an MMSE predictor has to be employed for the purpose of power control. Previously, in the literature, the predictor was used also in detection. The pilot-symbol system with MMSE power control is shown to achieve a clear performance improvement by employing a smoother, instead of the predictor, in detection. Furthermore, the performance loss caused by a feedback delay of 10%-20% from the channel coherence time appeared to be minor with reasonable bit-error rate levels. Finally, additional performance improvement using low-order diversity was shown to be considerable.
Original languageEnglish
Pages (from-to)1857 - 1861
Number of pages5
JournalIEEE Transactions on Communications
Volume52
Issue number11
DOIs
Publication statusPublished - 2004
MoE publication typeA1 Journal article-refereed

Fingerprint

Power control
Fading channels
Mean square error
Feedback
Communication
Rayleigh fading
Bit error rate
Modulation

Keywords

  • Rayleigh channels
  • delays
  • diversity reception
  • error statistics
  • feedback
  • least mean squares methods
  • power control
  • telecommunication control
  • feedback communication
  • low-order diversity
  • minimum mean square error
  • pilot-assisted modulation system
  • system-error probability
  • closed-loop method

Cite this

@article{119ada2011b244d1935243e3b32a3bcc,
title = "Power control and diversity in feedback communications over a fading channel",
abstract = "Pilot-symbol-assisted modulation system using feedback minimum mean-square error (MMSE) power control in subject to an unavoidable feedback delay, and in conjunction with diversity, is considered over a slow Rayleigh fading channel. Feedback MMSE power control is defined as a power-control function, with feedback MMSE predictions of the current channel fading gains as input that minimizes the system-error probability. The use of feedback requires causality, and an MMSE predictor has to be employed for the purpose of power control. Previously, in the literature, the predictor was used also in detection. The pilot-symbol system with MMSE power control is shown to achieve a clear performance improvement by employing a smoother, instead of the predictor, in detection. Furthermore, the performance loss caused by a feedback delay of 10{\%}-20{\%} from the channel coherence time appeared to be minor with reasonable bit-error rate levels. Finally, additional performance improvement using low-order diversity was shown to be considerable.",
keywords = "Rayleigh channels, delays, diversity reception, error statistics, feedback, least mean squares methods, power control, telecommunication control, feedback communication, low-order diversity, minimum mean square error, pilot-assisted modulation system, system-error probability, closed-loop method",
author = "Ilkka Saarinen and Aarne M{\"a}mmel{\"a}",
year = "2004",
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}

Power control and diversity in feedback communications over a fading channel. / Saarinen, Ilkka; Mämmelä, Aarne.

In: IEEE Transactions on Communications, Vol. 52, No. 11, 2004, p. 1857 - 1861.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Power control and diversity in feedback communications over a fading channel

AU - Saarinen, Ilkka

AU - Mämmelä, Aarne

PY - 2004

Y1 - 2004

N2 - Pilot-symbol-assisted modulation system using feedback minimum mean-square error (MMSE) power control in subject to an unavoidable feedback delay, and in conjunction with diversity, is considered over a slow Rayleigh fading channel. Feedback MMSE power control is defined as a power-control function, with feedback MMSE predictions of the current channel fading gains as input that minimizes the system-error probability. The use of feedback requires causality, and an MMSE predictor has to be employed for the purpose of power control. Previously, in the literature, the predictor was used also in detection. The pilot-symbol system with MMSE power control is shown to achieve a clear performance improvement by employing a smoother, instead of the predictor, in detection. Furthermore, the performance loss caused by a feedback delay of 10%-20% from the channel coherence time appeared to be minor with reasonable bit-error rate levels. Finally, additional performance improvement using low-order diversity was shown to be considerable.

AB - Pilot-symbol-assisted modulation system using feedback minimum mean-square error (MMSE) power control in subject to an unavoidable feedback delay, and in conjunction with diversity, is considered over a slow Rayleigh fading channel. Feedback MMSE power control is defined as a power-control function, with feedback MMSE predictions of the current channel fading gains as input that minimizes the system-error probability. The use of feedback requires causality, and an MMSE predictor has to be employed for the purpose of power control. Previously, in the literature, the predictor was used also in detection. The pilot-symbol system with MMSE power control is shown to achieve a clear performance improvement by employing a smoother, instead of the predictor, in detection. Furthermore, the performance loss caused by a feedback delay of 10%-20% from the channel coherence time appeared to be minor with reasonable bit-error rate levels. Finally, additional performance improvement using low-order diversity was shown to be considerable.

KW - Rayleigh channels

KW - delays

KW - diversity reception

KW - error statistics

KW - feedback

KW - least mean squares methods

KW - power control

KW - telecommunication control

KW - feedback communication

KW - low-order diversity

KW - minimum mean square error

KW - pilot-assisted modulation system

KW - system-error probability

KW - closed-loop method

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DO - 10.1109/TCOMM.2004.836588

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JO - IEEE Transactions on Communications

JF - IEEE Transactions on Communications

SN - 0090-6778

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ER -