Performance and Immunity Evaluation of Complete WLAN Systems in a Large Reverberation Chamber

This paper concerns the use of a large reverberation chamber (RC) to test a wireless local area network system based on both 802.11b/g and 802.11n standards including multiple input and multiple output (MIMO). A whole link established between commercial devices operates inside the RC under different loading conditions, varying the stirrer rotating speed and the paddle dimensions. The effects of this multipath environment on system performance are checked measuring the number of cyclic redundancy check error and the number of data retries. The comparison between the two systems is done adopting the same chamber loading condition and also stressing the system reducing the load, up to the link connection limit. Results show the higher performance of the MIMO system, able to maintain a 6-Mb/s data rate connection also with a chamber quality factor of 21 000. The same RC is used to carry out a radiated immunity test. The undesired signal is both a modulated and continuous wave injected into the active channel and into adjacent channels. Results reveal the high robustness of the 802.11n standard with respect to b and g standards when it operates in a hostile environment reproduced by an RC.

[1]  Charlie Orlenius,et al.  Repeatable performance measurements of MIMO systems in connected reverberation chambers with controlled keyhole effect , 2009, 2009 3rd European Conference on Antennas and Propagation.

[2]  C. Christopoulos,et al.  Assessing the performance of ZigBee in a reverberant environment using a mode stirred chamber , 2008, 2008 IEEE International Symposium on Electromagnetic Compatibility.

[3]  K. Gotoh,et al.  Evaluation of interference between MB-OFDM UWB and wireless LAN systems using a GTEM cell , 2008, 2008 IEEE International Symposium on Electromagnetic Compatibility.

[4]  Masamitsu Tokuda,et al.  Method of evaluating electromagnetic-interference characteristics of wireless LANs by narrowing frequency bandwidth of desired waves , 2009, 2009 20th International Zurich Symposium on Electromagnetic Compatibility.

[5]  Qiong Wu,et al.  Reverberation-Chamber Test Environment for Outdoor Urban Wireless Propagation Studies , 2010, IEEE Antennas and Wireless Propagation Letters.

[6]  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 .

[7]  V. M. Primiani,et al.  Analysis of the Independent Positions of Reverberation Chamber Stirrers as a Function of Their Operating Conditions , 2011, IEEE Transactions on Electromagnetic Compatibility.

[8]  Anders Rydberg,et al.  Arbitrary fading emulation using mode-stirred reverberation chambers with stochastic sample handling , 2011, Proceedings of the 5th European Conference on Antennas and Propagation (EUCAP).

[9]  Valter Mariani Primiani,et al.  Numerical Analysis of a New Location for the Working Volume Inside a Reverberation Chamber , 2012, IEEE Transactions on Electromagnetic Compatibility.

[10]  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.

[11]  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.

[12]  Olivier Delangre,et al.  Coupled reverberation chambers for emulating MIMO channels , 2009 .

[13]  Xiaoming Chen,et al.  Estimation of Average Rician K-Factor and Average Mode Bandwidth in Loaded Reverberation Chamber , 2011, IEEE Antennas and Wireless Propagation Letters.

[14]  Jan Carlsson,et al.  OTA Testing in Multipath of Antennas and Wireless Devices With MIMO and OFDM , 2012, Proceedings of the IEEE.

[15]  F. Moglie,et al.  Reverberation chamber as a statistical relaxation process: Entropy analysis and fast time domain simulations , 2012, International Symposium on Electromagnetic Compatibility - EMC EUROPE.

[16]  H. A. Shah,et al.  Static and Dynamic Propagation-Channel Impairments in Reverberation Chambers , 2011, IEEE Transactions on Electromagnetic Compatibility.

[17]  Zhinong Ying,et al.  WLAN MIMO throughput test in reverberation chamber , 2008, 2008 IEEE Antennas and Propagation Society International Symposium.

[18]  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 .

[19]  G. Ferrara,et al.  Characterization of GSM Non-Line-of-Sight Propagation Channels Generated in a Reverberating Chamber by Using Bit Error Rates , 2007, IEEE Transactions on Electromagnetic Compatibility.

[20]  J. Yun,et al.  Evaluation of Interference between Microwave Oven Noise and IEEE802.11b Using a GTEM Cell , 2009 .

[21]  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.

[22]  Kate A. Remley,et al.  Early Time Behavior in Reverberation Chambers and Its Effect on the Relationships Between Coherence Bandwidth, Chamber Decay Time, RMS Delay Spread, and the Chamber Buildup Time , 2012, IEEE Transactions on Electromagnetic Compatibility.

[23]  H. A. Shah,et al.  Reverberation Chamber Techniques for Determining the Radiation and Total Efficiency of Antennas , 2012, IEEE Transactions on Antennas and Propagation.

[24]  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.

[25]  Franco Moglie,et al.  Numerical Simulation of LOS and NLOS Conditions for an Antenna Inside a Reverberation Chamber , 2010 .

[26]  F. Moglie,et al.  System throughput and immunity analysis of a 802.11n WLAN in a large reverberation chamber , 2011, 2011 IEEE International Symposium on Electromagnetic Compatibility.

[27]  Valter Mariani Primiani,et al.  On the use of a reverberation chamber to test the performance and the immunity of a WLAN system , 2010, 2010 IEEE International Symposium on Electromagnetic Compatibility.

[28]  K A Remley,et al.  Simulating the Multipath Channel With a Reverberation Chamber: Application to Bit Error Rate Measurements , 2010, IEEE Transactions on Electromagnetic Compatibility.

[29]  D. Hill.  Plane wave integral representation for fields in reverberation chambers , 1998 .

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