Finger allocation for advanced WCDMA uplink

Paavo Hahtola, Ilkka Moilanen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


    In this paper, we study alternative finger allocation algorithms for high speed uplink packet access (HSUPA) mode of wideband code division multiple access (WCDMA) receiver. Higher order modulation methods and additional data channels require advanced receiver structures and good quality signal estimates. Multipath radio channel disperses the signal energy in time, and in the receiver, finger allocation algorithm is needed to find the timing instants containing resolvable signal components. We present two finger allocation methods which offer fast response to the changes in channel, collect the most of the signal energy, and still keep the computational burden within limits. The receiver uses a chip rate minimum mean-squared error frequency domain equalizer (MMSE-FDE) for detection of the signal. Avoiding the Rake type two-phase finger allocation and tracking, we employ the impulse response measurement (IRM) values for finger allocation. Fingers are frequently re-allocated, and no separate finger tracking is needed. Allocation takes place either based on a threshold comparison, or by attempting to maximize the collected signal energy with a fixed number of fingers. These methods can also be combined. Performance results of the finger allocation algorithms are provided via simulations, and also a complexity comparison between the presented methods is given.
    Original languageEnglish
    Title of host publicationProceedings
    Subtitle of host publicationIEEE Vehicular Technology Conference, VTC Fall 2011
    PublisherIEEE Institute of Electrical and Electronic Engineers
    Number of pages5
    ISBN (Electronic)978-1-4244-8327-3
    ISBN (Print)978-1-4244-8328-0
    Publication statusPublished - 2011
    MoE publication typeA4 Article in a conference publication
    Event74th IEEE Vehicular Technology Conference, VTC Fall 2011 - San Francisco, United States
    Duration: 5 Sept 20118 Sept 2011
    Conference number: 74


    Conference74th IEEE Vehicular Technology Conference, VTC Fall 2011
    Abbreviated titleVTC Fall 2011
    Country/TerritoryUnited States
    CitySan Francisco


    • finger allocation
    • HSUPA
    • frequency domain processing
    • MMSE equalization


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