Channel Sounding of Loaded Reverberation Chamber for Over-the-Air Testing of Wireless Devices: Coherence Bandwidth Versus Average Mode Bandwidth and Delay Spread

This letter finds the relation between different parameters that characterize the reverberation chamber as a channel emulator for over-the-air (OTA) testing of wireless devices and components. It is shown experimentally for the first time that the coherence bandwidth is proportional to the average mode bandwidth of the chamber. Both coherence bandwidth and average mode bandwidth increase when the chamber is loaded with absorbing objects, and thereby, the reverberation chamber can be controlled to emulate many different real-life environments. The relationship between RMS delay spread and coherence bandwidth are found from the measured channel response and are equal to the theoretical relation for isotropic multipath environments, being within previously published fundamental limits.

[1]  Bernard H. Fleury,et al.  An uncertainty relation for WSS processes and its application to WSSUS systems , 1996, IEEE Trans. Commun..

[2]  K. Pahlavan,et al.  Measurement and analysis of the indoor radio channel in the frequency domain , 1990 .

[3]  N. Serafimov,et al.  Comparison between radiation efficiencies of phone antennas and radiated power of mobile phones measured in anechoic chambers and reverberation chamber , 2002, IEEE Antennas and Propagation Society International Symposium (IEEE Cat. No.02CH37313).

[4]  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.

[5]  Ramjee Prasad,et al.  Wideband indoor channel measurements and BER analysis of frequency selective multipath channels at 2.4, 4.75, and 11.5 GHz , 1996, IEEE Trans. Commun..

[6]  Per-Simon Kildal,et al.  Theoretical derivation and measurements of the relationship between coherence bandwidth and RMS delay spread in reverberation chamber , 2009, 2009 3rd European Conference on Antennas and Propagation.

[7]  D. Hill,et al.  Aperture Excitation of Electrically Large, Lossy Cavities , 1993 .

[8]  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).

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

[10]  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.

[11]  M. Gans.  A power-spectral theory of propagation in the mobile-radio environment , 1972 .

[12]  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.

[13]  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 .

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

[15]  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 .

[16]  W. C. Jakes,et al.  Microwave Mobile Communications , 1974 .