Estimation of Average Rician K-Factor and Average Mode Bandwidth in Loaded Reverberation Chamber

A well-stirred reverberation chamber without noticeable direct coupling between the transmitting and receiving antennas emulates an isotropic Rayleigh fading environment and can therefore be used for qualitative over-the-air (OTA) measurements of wireless devices with small nondirective antennas. By loading such a chamber, it is possible to generate a Rician environment. This letter introduces an average Rician K-factor that describes the reverberation chamber better than the normal K-factor, in particular when the chamber is provided with platform and polarization stirring. This letter shows how to estimate this average K-factor. The average mode bandwidth also changes by loading the chamber. While the average K-factor determines uncertainty, the average mode bandwidth determines the channel coherence bandwidth. They are therefore the two most important parameters for the characterizations of a reverberation chamber.

[1]  P.-S. Kildal,et al.  Investigation of Heavily Loaded Reverberation Chamber for Testing of Wideband Wireless Units , 2006, 2006 IEEE Antennas and Propagation Society International Symposium.

[2]  Xiaoming Chen,et al.  Direct coupling as a residual error contribution during OTA measurements of wireless devices in reverberation chamber , 2009, 2009 IEEE Antennas and Propagation Society International Symposium.

[3]  Xiaoming Chen,et al.  Channel Sounding of Loaded Reverberation Chamber for Over-the-Air Testing of Wireless Devices: Coherence Bandwidth Versus Average Mode Bandwidth and Delay Spread , 2009, IEEE Antennas and Wireless Propagation Letters.

[4]  Theodore S. Rappaport,et al.  Wireless communications - principles and practice , 1996 .

[5]  P. Kildal,et al.  Characterization of Reverberation Chambers for OTA Measurements of Wireless Devices: Physical Formulations of Channel Matrix and New Uncertainty Formula , 2012, IEEE Transactions on Antennas and Propagation.

[6]  P.-S. Kildal,et al.  Characterization of antennas for mobile and wireless terminals by using reverberation chambers: improved accuracy by platform stirring , 2001, IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229).

[7]  Per-Simon Kildal,et al.  Detection of a polarization imbalance in reverberation chambers and how to remove it by polarization stirring when measuring antenna efficiencies , 2002 .

[8]  Per-Simon Kildal,et al.  Correlation and capacity of MIMO systems and mutual coupling, radiation efficiency, and diversity gain of their antennas: simulations and measurements in a reverberation chamber , 2004, IEEE Communications Magazine.

[9]  J. Carlsson,et al.  Study of antennas in reverberation chamber using method of moments with cavity Green's function calculated by Ewald summation , 2005, IEEE Transactions on Electromagnetic Compatibility.

[10]  D. Hill,et al.  On the Use of Reverberation Chambers to Simulate a Rician Radio Environment for the Testing of Wireless Devices , 2006, IEEE Transactions on Antennas and Propagation.

[11]  Theodore S. Rappaport,et al.  Wireless Communications: Principles and Practice (2nd Edition) by , 2012 .

[12]  P.-S. Kildal,et al.  Measurements of total isotropic sensitivity and average fading sensitivity of CDMA phones in reverberation chamber , 2005, 2005 IEEE Antennas and Propagation Society International Symposium.

[13]  P. Kildal,et al.  Radiation efficiency, correlation, diversity gain and capacity of a six-monopole antenna array for a MIMO system: theory, simulation and measurement in reverberation chamber , 2005 .

[14]  Martine Lienard,et al.  Delay spread and coherence bandwidth in reverberation chamber , 2008 .