On creating a nonisotropic propagation environment inside a scattered field chamber

Abstract

A traditional reverberation chamber creates a statistically isotropic test environment. Tests of communication devices may demand different environments to be able to test, for example, the influence of a diversity antenna. Here, a simple way of altering the distribution of plane waves incident on the device under test is presented. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 43: 192–195, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20417

Reverberation-Chamber Test Environment for Outdoor Urban Wireless Propagation Studies

“…We then take the inverse Fourier transform of the measured and corrected transmission parameters to find the power delay profile of the channel. We calculate the RMS delay spread as the square root of the second central moment of the power delay profile as (1) By taking several measurements and averaging them, the random component of the measurement uncertainty is reduced. For the measurements reported here, we took 200 repeat measurements.…”

“…The carrier signal produced by the generator is a sinusoidal function, which can be represented as (1) where is the peak amplitude, is the carrier frequency, and is the phase of the carrier. The modulation signal, a chain of rectangular pulses, is described as otherwise (2) Here, is the duration of one pulse, is the dc offset of the signal, is the period, and is the amplitude of the pulse.…”

“…ECENT publications have described the use of reverberation chambers for efficient, repeatable, free-field testing of wireless devices [1]- [7], improved channel modeling [8], and simulating specific environments [9]- [11]. By adjusting the quality factor of the reverberation chamber's highly reflective cavity through the addition of RF absorbing material, it is possible to tune the decay time of the chamber to simulate realworld propagation environments.…”

Emulation of MIMO Nonisotropic Fading Environments With Reverberation Chambers

“…In Scenario B, one absorber piece of 24 cones is placed on the right-hand side wall of the chamber. Since the dipoles do not receive the expected multipath component of the absorbed side [5], a nonisotropic scattering scenario is obtained with modified AoA and reduced MPC compared to Scenario A. In Scenario C, two absorbers are used instead of one by adding a second absorber to the left-hand side, and a modified AoA histogram along with a further reduction of MPC is expected.…”

Bit Error Rate Measurements in Reverberation Chambers Using Real-Time Vector Receivers

“…These applications include: measurement of factor [1], measurement of radiated power from mobile phones [2], measurements on multiple-input-multiple-output (MIMO) systems [3], simulated channel testing in Rayleigh multipath environments [4]- [6], and measurements of receiver sensitivity of mobile terminals [7].…”