Further results on adaptive CDMA cell sectorization with linear multiuser detection

Changyoon Oh, Aylin Yener

    Research output: Contribution to journalConference article

    Abstract

    We consider the adaptive sectorization problem for a CDMA system under the imperfect directional antenna. Specifically, given the number of sectors and terminal locations, and assuming base station employs linear multiuser detection, we investigate how to appropriately sectorize the cell, such that the total transmit power is minimized, while each user has acceptable quality of service. We observe uplink/downlink duality under the assumption of matched filter and perfect antenna response. We also investigate adaptive sectorization problem in the more realistic scenario of imperfect directional antenna response. We employ MMSE power control to suppress both the intrasector interference and the intersector interference. As the optimum solution for arbitrary signature sets may have high complexity, we propose simpler suboptimum methods. The results suggest that by Intelligently combining adaptive cell sectorization, power control and temporal linear multiuser detection, we are able to increase the uplink user capacity of the cell. We provide numerical results showing the robustness of optimum sectorization against Gaussian channel estimation error.

    Original languageEnglish (US)
    Pages (from-to)37-41
    Number of pages5
    JournalConference Record of the Asilomar Conference on Signals, Systems and Computers
    Volume1
    StatePublished - Dec 1 2003
    EventConference Record of the Thirty-Seventh Asilomar Conference on Signals, Systems and Computers - Pacific Grove, CA, United States
    Duration: Nov 9 2003Nov 12 2003

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    Multiuser detection
    Code division multiple access
    Antennas
    Power control
    Matched filters
    Channel estimation
    Robustness (control systems)
    Base stations
    Quality of service

    All Science Journal Classification (ASJC) codes

    • Signal Processing
    • Computer Networks and Communications

    Cite this

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    abstract = "We consider the adaptive sectorization problem for a CDMA system under the imperfect directional antenna. Specifically, given the number of sectors and terminal locations, and assuming base station employs linear multiuser detection, we investigate how to appropriately sectorize the cell, such that the total transmit power is minimized, while each user has acceptable quality of service. We observe uplink/downlink duality under the assumption of matched filter and perfect antenna response. We also investigate adaptive sectorization problem in the more realistic scenario of imperfect directional antenna response. We employ MMSE power control to suppress both the intrasector interference and the intersector interference. As the optimum solution for arbitrary signature sets may have high complexity, we propose simpler suboptimum methods. The results suggest that by Intelligently combining adaptive cell sectorization, power control and temporal linear multiuser detection, we are able to increase the uplink user capacity of the cell. We provide numerical results showing the robustness of optimum sectorization against Gaussian channel estimation error.",
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    T1 - Further results on adaptive CDMA cell sectorization with linear multiuser detection

    AU - Oh, Changyoon

    AU - Yener, Aylin

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    N2 - We consider the adaptive sectorization problem for a CDMA system under the imperfect directional antenna. Specifically, given the number of sectors and terminal locations, and assuming base station employs linear multiuser detection, we investigate how to appropriately sectorize the cell, such that the total transmit power is minimized, while each user has acceptable quality of service. We observe uplink/downlink duality under the assumption of matched filter and perfect antenna response. We also investigate adaptive sectorization problem in the more realistic scenario of imperfect directional antenna response. We employ MMSE power control to suppress both the intrasector interference and the intersector interference. As the optimum solution for arbitrary signature sets may have high complexity, we propose simpler suboptimum methods. The results suggest that by Intelligently combining adaptive cell sectorization, power control and temporal linear multiuser detection, we are able to increase the uplink user capacity of the cell. We provide numerical results showing the robustness of optimum sectorization against Gaussian channel estimation error.

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