SNR estimation for multi-antenna communication systems with closely spaced antenna elements

In this paper, we investigate the performance of the multiantenna communication systems, when antenna elements are closely spaced. We analyze the combined mutual coupling effect on both, signal and thermal noise. We apply the Nyquist’s thermal noise theorem to determine the thermal noise in the multi-antenna system and to confirm the partial correlation of thermal noise for antenna spacing lower then one wavelength. Then, we evaluate the thermal noise power behavior for the coupled multi-element antenna system. Simulation results show that the signalto-noise ratio level is underestimated if the effect of mutual coupling for thermal noise is not accounted for.

[1]  Thomas Svantesson,et al.  Mutual coupling effects on the capacity of multielement antenna systems , 2001, 2001 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.01CH37221).

[2]  M.A. Jensen,et al.  Network model for MIMO systems with coupled antennas and noisy amplifiers , 2005, IEEE Transactions on Antennas and Propagation.

[3]  Hüseyin Arslan,et al.  Dynamics of spatial correlation and implications on MIMO systems , 2004, IEEE Communications Magazine.

[4]  Arthur Tisso Starr.  Electric circuits and wave filters , 1934 .

[5]  I. Gupta,et al.  Effect of mutual coupling on the performance of adaptive arrays , 1983 .

[6]  M. J. Gans,et al.  On Limits of Wireless Communications in a Fading Environment when Using Multiple Antennas , 1998, Wirel. Pers. Commun..

[7]  S. Deger,et al.  Effect of Mutual Coupling on the Performance of Adaptive Arrays , 2006, 2006 IEEE 14th Signal Processing and Communications Applications.

[8]  Christian Waldschmidt,et al.  Complete RF system model for analysis of compact MIMO arrays , 2004, IEEE Transactions on Vehicular Technology.

[9]  R. Twiss,et al.  Nyquist's and Thevenin's Theorems Generalized for Nonreciprocal Linear Networks , 1955 .

[10]  P. Sadeghi,et al.  Mutual coupling effect on thermal noise in multi-antenna wireless communication systems , 2005, 2005 Australian Communications Theory Workshop.

[11]  Michael A. Jensen,et al.  Mutual coupling in MIMO wireless systems: a rigorous network theory analysis , 2004, IEEE Transactions on Wireless Communications.

[12]  R. Janaswamy.  Effect of element mutual coupling on the capacity of fixed length linear arrays , 2002, IEEE Antennas and Wireless Propagation Letters.