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Beamforming effects on measured mm-wave channel characteristics

Wyne, Shurjeel LU ; Haneda, Katsuyuki; Ranvier, Sylvain; Tufvesson, Fredrik LU and Molisch, Andreas LU (2011) In IEEE Transactions on Wireless Communications 10(11). p.3553-3559
Abstract
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,... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
60 GHz communications, beamforming, radio channel, delay spread, measurements
in
IEEE Transactions on Wireless Communications
volume
10
issue
11
pages
3553 - 3559
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • wos:000298328900001
  • scopus:83555164794
ISSN
1536-1276
DOI
10.1109/TWC.2011.083111.100195
language
English
LU publication?
yes
id
978d2650-cabc-4e9a-abc8-34ef87313459 (old id 2273339)
date added to LUP
2012-01-02 14:21:41
date last changed
2017-10-01 04:32:52
@article{978d2650-cabc-4e9a-abc8-34ef87313459,
  abstract     = {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.},
  author       = {Wyne, Shurjeel and Haneda, Katsuyuki and Ranvier, Sylvain and Tufvesson, Fredrik and Molisch, Andreas},
  issn         = {1536-1276},
  keyword      = {60 GHz communications,beamforming,radio channel,delay spread,measurements},
  language     = {eng},
  number       = {11},
  pages        = {3553--3559},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  series       = {IEEE Transactions on Wireless Communications},
  title        = {Beamforming effects on measured mm-wave channel characteristics},
  url          = {http://dx.doi.org/10.1109/TWC.2011.083111.100195},
  volume       = {10},
  year         = {2011},
}