Abstract
With the ever-growing requirement for higher data rates, terminals supporting multiple-input multiple-output (MIMO) technologies are being developed for next-generation. As for wireless device manufacturers, a radio performance evaluation of multi-antenna terminals in desired environments is mandatory before product release. This paper discusses the Over the Air (OTA) performance evaluation of antenna diversity systems in Indoor and Outdoor multi-path propagation channel models inside anechoic chamber, in terms of correlation coefficients and diversity gain (DG). These channel models have been emulated in terms of angles of arrivals (AoA) and cross-polarization ratio (XPR) with Rayleigh fading. For this purpose, SATIMO SG24 measurement system has been used. However, the actual configuration of this system is not able to emulate desired realistic environments. Therefore, an innovative methodology based on the SG24 probes control has been developed. The obtained results in simulations and measurements have shown a good agreement.
Highlights
This paper discusses the Over the Air (OTA) performance evaluation of antenna diversity systems in Indoor and Outdoor multi-path propagation channel models inside anechoic chamber, in terms of correlation coefficients and diversity gain (DG)
Since multiple-input multiple-output (MIMO) terminal performances testing in real network is expensive in time consuming, and labor intensive, many OTA methodologies have been adopted in Cellular Telephone Industries Association (CTIA) and 3GPP [1] to evaluate the overall performance of the multi-antenna terminals in a reliable, repeatable, and feasible way in laboratory conditions
We evaluate the performance of an antenna diversity system using a new test method considerably less complex than other techniques proposed in the literature, in terms of cost-effectiveness
Summary
Long Term Evolution (LTE) and IEEE 802.11n are employing MIMO antenna systems on mobile terminals in order to improve the capacity of data transmission and to overcome the detrimental effects of signal multipath fading when trying to achieve high data throughput in limited-bandwidth channels. Wireless device manufacturers urgently require standard testing methods that are suitable to evaluate antenna diversity performances before product release These performances are strongly dependent on antennas properties and the multi-path fading environment. We evaluate the performance of an antenna diversity system using a new test method considerably less complex than other techniques proposed in the literature, in terms of cost-effectiveness. This method is based on replacing the channel emulator with a switch in order to generate a desired realistic Rayleigh channel in terms of AoA and XPR, based on the ignition probabilities of emitting antennas. Two types of propagation models, such as Indoor and Outdoor in terms of AoA, are used for OTA testing in terms of correlation coefficient and diversity gain (DG) computed from the signals received at the different branches of the antenna systems
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