MIMO Over‐The‐Air Testing

Simulations of a planar array arrangement for automotive Random-LOS OTA testing

“…OTA testing is mainly concerned with measuring the performance of the whole device including the antennas [1]. Compact reverberation chambers (with reflecting walls) and anechoic chambers (with absorbing walls) have the potential to be used for OTA characterization of wireless devices on cars [2].…”

“…Compact reverberation chambers (with reflecting walls) and anechoic chambers (with absorbing walls) have the potential to be used for OTA characterization of wireless devices on cars [2]. On one hand, reverberation chambers have longer been known to be useful for both passive and active OTA testing in RIMP (Rich Isotropic MultiPath) channels [1], [3]. On the other hand, the new compact anechoic (or even semi-anechoic) chamber is used to emulate the so-called Random Line-of-Sight (RLOS) propagation channel.…”

Zero-forcing MIMO efficiency in random line-of-sight

“…Over-The-Air (OTA) testing techniques emulating the Rich Isotropic Multipath (RIMP) environments in reverberation chambers have been developed and used in practice since year 2000 [1]. On the other hand, even if the Line-Of-Sight (LOS) channel has long been used for classical antenna measurements in anechoic chambers, it has only recently been "refurbished" to work for OTA applications [2].…”

On OTA Test in the Presence of Doppler Spreads in a Reverberation Chamber

“…During the past decade, the RC has been successfully used in various over-the-air (OTA) tests [1]- [9]. For example, it has been used for measuring the bit error rate (BER) of certain telecommunication systems [2], [3], and the total radiated power (TRP) and the total isotropic sensitivity (TIS) of mobile terminals [4], [5].…”

“…Assume that the advance coding is powerful enough so that the receiver in an additive white Gaussian noise (AWGN) channel has a PER of zero once the received power is above a certain threshold value, and of one otherwise. Mathematically, the PER of a threshold receiver in an AWGN channel can be expressed as (1) where denotes the SNR and represents the threshold value. In a fading environment, the average PER is (2) where represents the average and denotes the probability density function (pdf) of for a given .…”