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",
    doi = "10.1109/TCOMM.2004.836588",
    language = "English",
    volume = "52",
    pages = "1857 -- 1861",
    journal = "IEEE Transactions on Communications",
    issn = "0090-6778",
    publisher = "IEEE Institute of Electrical and Electronic Engineers",
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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

    U2 - 10.1109/TCOMM.2004.836588

    DO - 10.1109/TCOMM.2004.836588

    M3 - Article

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    SP - 1857

    EP - 1861

    JO - IEEE Transactions on Communications

    JF - IEEE Transactions on Communications

    SN - 0090-6778

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    ER -