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OTA Testing in Multipath of Antennas and Wireless Devices With MIMO and OFDM

Per-Simon Kildal (Institutionen för signaler och system, Antenner) ; Charlie Orlenius (Institutionen för signaler och system, Antenner) ; Jan Carlsson (Institutionen för signaler och system, Antenner)
Proceedings of the IEEE (0018-9219). Vol. 100 (2012), 7, p. 2145-2157.
[Konferensbidrag, refereegranskat]

New over-the-air (OTA) measurement technology is wanted for quantitative testing of modern wireless devices for use in multipath. We show that the reverberation chamber emulates a rich isotropic multipath (RIMP), making it an extreme reference environment for testing of wireless devices. This thereby complements testing in anechoic chambers representing the opposite extreme reference environment: pure line-of-sight (LOS). Antenna diversity gain was defined for RIMP environments based on improved fading performance. This paper finds this RIMP-diversity gain also valid as a metric of the cumulative improvement of the 1% worst users randomly distributed in the RIMP environment. The paper argues that LOS in modern wireless systems is random due to randomness of the orientations of the users and their devices. This leads to the definition of cumulative LOS-diversity gain of the 1% worst users in random LOS. This is generally not equal to the RIMP-diversity gain. The paper overviews the research on reverberation chambers for testing of wireless devices in RIMP environments. Finally, it presents a simple theory that can accurately model measured throughput for a long-term evolution (LTE) system with orthogonal frequency-division multiplexing (OFDM) and multiple-input-multiple-output (MIMO), the effects of which can clearly be seen and depend on the controllable time delay spread in the chamber.

Nyckelord: Antenna measurements, multipath, multiple-input-multiple-output (MIMO), over-the-air (OTA) measurements, Rayleigh fading, reverberation chamber, error rate measurements, reverberation-chamber, diversity gain, radiation efficiency, capacity, environment, systems, channel

Denna post skapades 2012-08-15. Senast ändrad 2013-06-28.
CPL Pubid: 161662


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Institutioner (Chalmers)

Institutionen för signaler och system, Antenner (2005-2014)


Elektroteknik och elektronik

Chalmers infrastruktur