Diversity Gain Influenced by Polarization and Spatial Diversity Techniques in Ultrawideband

This paper presents an experimental investigation of diversity gain influenced by polarization and spatial diversity techniques in ultrawideband (UWB) radio technology. To this aim, two different coplanar-fed UWB diversity antennas having the same size and employing identical monopoles were taken and both effective and apparent diversity gain were measured in a reverberation chamber. To extract the diversity gain, three commonly used approaches to combine diversity (i.e., selection, equal gain, and maximal ratio) have been considered. Results showed that >1 dB (~ 26 %) improvement in diversity gain is obtained over most of the considered band for polarization diversity case as compared with spatial case, showing the usefulness of polarization diversity for future UWB diversity applications.

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

[2]  Rittwik Jana,et al.  Measurement and modeling of an ultra-wide bandwidth indoor channel , 2004, IEEE Transactions on Communications.

[3]  P. Kildal,et al.  Study of distributions of modes and plane waves in reverberation chambers for the characterization of antennas in a multipath environment , 2001 .

[4]  Yang Hao,et al.  Ultra wideband antenna diversity techniques for on/off-body radio channel characterisation , 2012, 2012 IEEE International Workshop on Antenna Technology (iWAT).

[5]  A.M.D. Turkmani,et al.  An experimental evaluation of the performance of two-branch space and polarization diversity schemes at 1800 MHz , 1995 .

[6]  Joonho Byun,et al.  Definition of effective diversity gain and how to measure it in a reverberation chamber , 2002 .

[7]  Akram Alomainy,et al.  EXPERIMENTAL INVESTIGATION OF ULTRA WIDEBAND DIVERSITY TECHNIQUES FOR ON-BODY RADIO COMMUNICATIONS , 2013 .

[8]  W. Stutzman,et al.  Spatial, polarization, and pattern diversity for wireless handheld terminals , 2001 .

[9]  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.

[10]  Rod Waterhouse.  Printed Antennas for Wireless Communications - RSP , 2008 .

[11]  Kwai-Man Luk,et al.  Pattern and Polarization Diversity Antenna With High Isolation for Portable Wireless Devices , 2009, IEEE Antennas and Wireless Propagation Letters.

[12]  P.S. Hall,et al.  Diversity Performance Analysis for On-Body Communication Channels at 2.45 GHz , 2009, IEEE Transactions on Antennas and Propagation.

[13]  Jian Yang,et al.  MRC Diversity and MIMO Capacity Evaluations of Multi-Port Antennas Using Reverberation Chamber and Anechoic Chamber , 2013, IEEE Transactions on Antennas and Propagation.

[14]  Martin Nilsson,et al.  Polarization diversity gain and base station antenna characteristics , 1999, 1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363).

[15]  P.S. Hall,et al.  Multiple Antenna Reception at 5.8 and 10 GHz for Body-Centric Wireless Communication Channels , 2009, IEEE Transactions on Antennas and Propagation.

[16]  Per-Simon Kildal,et al.  Compact Formulas for Diversity Gain of Two-Port Antennas , 2010, IEEE Antennas and Wireless Propagation Letters.

[17]  Le Chung Tran.  Complex Orthogonal Space-Time Processing in Wireless Communications , 2006 .

[18]  J. Tarng,et al.  Frequency-Space-Polarization on UWB MIMO Performance for Body Area Network Applications , 2008 .

[19]  Yide Wang,et al.  A comparison between spatial and polarisation diversity for transmit beamforming techniques , 2005, The European Conference on Wireless Technology, 2005..

[20]  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.

[21]  A. Giorgetti,et al.  Antenna diversity in UWB indoor channel , 2008, 2008 IEEE International Conference on Ultra-Wideband.

[22]  Anja K. Skrivervik,et al.  A Novel Compact CPW-Fed Polarization Diversity Ultrawideband Antenna , 2014, IEEE Antennas and Wireless Propagation Letters.

[23]  Jan Carlsson,et al.  Fast Converging Measurement of MRC Diversity Gain in Reverberation Chamber Using Covariance-Eigenvalue Approach , 2011, IEICE Trans. Electron..