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    Beamforming effects on measured mm-wave channel characteristics

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    Authors
    Wyne, S.
    Haneda, K.
    Ranvier, S.
    Tufvesson, F.
    Molisch, A.F.
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    Discipline
    Physical sciences
    Subject
    60 GHz band
    Array gain
    Array sizes
    Beamformers
    Channel characteristics
    Delay spread
    Eigenmode transmission
    Excess delay
    Line-of-sight scenarios
    mm-Wave
    Narrow bands
    Performance degradation
    Planar arrays
    radio channel
    Scattering environment
    Signal to noise
    Spatial structure
    Ultra-wideband radio
    Upper Bound
    Upper limits
    Wide-band
    Array processing
    Measurements
    Millimeter waves
    Radio broadcasting
    Radio transmission
    Signal to noise ratio
    Beamforming
    Audience
    Scientific
    Date
    2011
    Metadata
    Show full item record
    Description
    Beamforming is an important feature of 60 GHz communications. We present an analysis of the influence of beamforming in indoor ultrawideband radio channels measured in the mm-wave 60 GHz band. The performance of narrowband and wideband direction-based beamformers is investigated in terms of improving channel metrics such as the delay spread, excess delay, and the signal-to-noise ratio (SNR). The performance of the direction-based beamformers is compared with dominant eigenmode transmission and statistical beamforming. Our analysis reveals that in line-of-sight (LOS) scenarios, the two direction-based beamformers have a similar performance that approaches the upper bound set by dominant eigenmode transmission. In non-LOS (NLOS) scenarios, the direction-based beamformers show a performance degradation in relation to the upper bound, with the narrowband beamformer worse off than the wideband variant. The array gain in our measured NLOS scenarios is observed to exceed the theoretical upper limit valid for a rich scattering environment. We show that this result follows from the spatial structure of the measured NLOS channels that has only a few strong reflected components. We investigate the influence of array size on beamforming performance; 5×5 planar arrays are observed to improve the channel's delay metrics as well as the larger 7×7 planar arrays.
    Citation
    Wyne, S.; Haneda, K.; Ranvier, S.; Tufvesson, F.; Molisch, A.F. (2011). Beamforming effects on measured mm-wave channel characteristics. , IEEE Transactions on Wireless Communications, Vol. 10, Issue 11, 3553-3559, DOI: 10.1109/TWC.2011.083111.100195.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/3152
    doi: http://dx.doi.org/10.1109/TWC.2011.083111.100195
    scopus: 2-s2.0-83555164794
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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