Digitally assisted analog beamforming for millimeter-wave communication

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    Abstract

    The paper addresses the research question on how digital beamsteering algorithms can be combined with analog beamforming in the context of millimeter-wave communication for next generation (5G) cellular systems. Key is the use of coarse quantisation of the individual antenna signals next to the analog beamforming. The extreme case of single bit quantization is analyzed. Direction-of-Arrival (DoA) estimation, being the crucial element in beamsteering, is only slightly deteriorated compared to DoA estimation based on full precision (analog) signals. For Signal-to-Noise Ratios (SNRs) below 0 dB, single bit quantization introduces »2 dB noise level increase. For SNRs beyond 0 dB, the standard deviation of the DoA estimate, levels out to below 10−4 radian in our specific case study. An additional correction called the Van Vleck correction, mitigates the effects of single bit quantization. This effect can clearly be seen in case multiple signals impinge on the array. When using this correction, the probability of correct detection of multiple sources (in this paper we use 2 sources) is comparable to the performance of an analog system. We therefore conclude that digital beamsteering can effectively and efficiently be combined with analog beamforming.
    Original languageEnglish
    Title of host publicationIEEE International conference on communications 2015
    Place of PublicationUSA
    PublisherIEEE Communications Society
    Pages1039-1044
    Number of pages6
    ISBN (Print)978-1-4673-6305-1
    Publication statusPublished - 8 Jun 2015
    EventIEEE International Conference on Communications, ICC 2015 - London, United Kingdom
    Duration: 8 Jun 201515 Jun 2015

    Publication series

    Name
    PublisherIEEE Communications Society

    Workshop

    WorkshopIEEE International Conference on Communications, ICC 2015
    Abbreviated titleICC
    CountryUnited Kingdom
    CityLondon
    Period8/06/1515/06/15

    Keywords

    • EWI-26156
    • IR-96627
    • METIS-312676

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