Simple calculation of ergodic capacity of lossless two-port antenna system using only S-parameters - Comparison with common Z-parameter approach

In this paper, we show how to correctly include overall antenna effects in a numerically generated Rayleigh channel matrix when calculating ergodic MIMO capacity of lossless multi-port antenna system located in rich isotropic multipath. The overall antenna effects can be included correctly using either impedance parameters (Z-parameter method) or scattering parameters (S-parameter method). These two methods are compared and validated by measurements in anechoic and reverberation chambers. A narrowband handset antenna with negligible ohmic loss is used for the measurements. There are very good agreements between the capacities obtained using both methods from anechoic chamber measurement and that from direct channel measurement in reverberation chamber.

[1]  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 .

[2]  Marianna Ivashina,et al.  Definition of unifying decoupling efficiency of different array antennas—Case study of dense focal plane array feed for parabolic reflector , 2010 .

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

[4]  Jordi Romeu Robert,et al.  Exact representation of antenna system diversity performance from input parameter description , 2003 .

[5]  W. Wasylkiwskyj,et al.  Theory of mutual coupling among minimum-scattering antennas , 1970 .

[6]  Wen Fong Tsen,et al.  Uncoupled Impedance Matching for Capacity Maximization of Compact MIMO Arrays , 2009, IEEE Antennas and Wireless Propagation Letters.

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

[8]  R.G. Vaughan,et al.  Antenna diversity in mobile communications , 1987, IEEE Transactions on Vehicular Technology.

[9]  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.

[10]  P. Vainikainen,et al.  On diversity performance of two-element coupling element based antenna structure for mobile terminal , 2010, Proceedings of the Fourth European Conference on Antennas and Propagation.

[11]  Branka Vucetic,et al.  Space-Time Coding , 2003 .

[12]  Claude Oestges,et al.  MIMO Wireless Communications: From Real-World Propagation to Space-Time Code Design , 2007 .

[13]  Angel E. Lozano,et al.  Effect of antenna separation on the capacity of BLAST in correlated channels , 2000, IEEE Communications Letters.

[14]  Buon Kiong Lau,et al.  Optimal Single-Port Matching Impedance for Capacity Maximization in Compact MIMO Arrays , 2008, IEEE Transactions on Antennas and Propagation.

[15]  Jian Yang,et al.  Comparison of Ergodic Capacities From Wideband MIMO Antenna Measurements in Reverberation Chamber and Anechoic Chamber , 2011, IEEE Antennas and Wireless Propagation Letters.

[16]  D. Pozar.  Microwave Engineering , 1990 .

[17]  Branka Vucetic,et al.  Space-Time Coding , 2003 .

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