Efficient experimental evaluation of a MIMO handset with user influence

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Efficient experimental evaluation of a MIMO handset with user influence. / Harrysson, Fredrik; Medbo, Jonas; Molisch, Andreas; Johansson, Anders J; Tufvesson, Fredrik.

In: IEEE Transactions on Wireless Communications, Vol. 9, No. 2, 2010, p. 853-863.

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T1 - Efficient experimental evaluation of a MIMO handset with user influence

AU - Harrysson, Fredrik

AU - Medbo, Jonas

AU - Molisch, Andreas

AU - Johansson, Anders J

AU - Tufvesson, Fredrik

PY - 2010

Y1 - 2010

N2 - The immediate environment of handset antennas, including the casings and the users holding the handsets, has a strong impact on the radio channel in mobile communication. In this paper we investigate a composite channel method that synthetically combines double-directional measurements of the userless propagation channel with measured super-antenna patterns, i.e., patterns of the combined antenna-casing-user arrangement. We experimentally evaluate the method by comparing results (power, capacity, and eigenvalue distribution) obtained from this composite method with direct measurements in the same environment. The measurements were done in two static 8 × 4 MIMO scenarios at 2.6 GHz, with the user indoors and the base station located outdoors and indoors, respectively. A realistic user phantom together with a “smart-phone” handset mock-up with four antenna elements was used, and different configurations and orientations were tested. The method gives statistical distributions of the MIMO eigenvalues, that are close to the measured. By using the composite method, we found that the user, apart from introducing hand and body loss that mainly decreases the SNR of the channel, slightly increases the correlation between the fading at the antenna elements.

AB - The immediate environment of handset antennas, including the casings and the users holding the handsets, has a strong impact on the radio channel in mobile communication. In this paper we investigate a composite channel method that synthetically combines double-directional measurements of the userless propagation channel with measured super-antenna patterns, i.e., patterns of the combined antenna-casing-user arrangement. We experimentally evaluate the method by comparing results (power, capacity, and eigenvalue distribution) obtained from this composite method with direct measurements in the same environment. The measurements were done in two static 8 × 4 MIMO scenarios at 2.6 GHz, with the user indoors and the base station located outdoors and indoors, respectively. A realistic user phantom together with a “smart-phone” handset mock-up with four antenna elements was used, and different configurations and orientations were tested. The method gives statistical distributions of the MIMO eigenvalues, that are close to the measured. By using the composite method, we found that the user, apart from introducing hand and body loss that mainly decreases the SNR of the channel, slightly increases the correlation between the fading at the antenna elements.

KW - channelmeasurement

KW - Mobile communication

KW - channel model

KW - user phantom

KW - multiple-input multiple-output(MIMO)

U2 - 10.1109/TWC.2010.02.090588

DO - 10.1109/TWC.2010.02.090588

M3 - Article

VL - 9

SP - 853

EP - 863

JO - IEEE Transactions on Wireless Communications

JF - IEEE Transactions on Wireless Communications

SN - 1536-1276

IS - 2

ER -