Presenters

Per-Simon KildalChalmers University of Technology, Sweden

Andrés Alayón Glazunov, Chalmers University of Technology, Sweden

Christian Lötbäck Patané, Bluetest AB, Sweden

Abstract

The reverberation chamber has through the last fifteen years been used to emulate a rich isotropic multipath (RIMP) environment, and it has successfully demonstrated its ability to test Over-The-Air (OTA) performance of multiport antennas and active wireless devices. The latter include e.g., handsets, laptops and small base stations.  The measured throughputs of practical 4G LTE devices with MIMO and OFDM capabilities have been shown to be in excellent agreement with basic theoretical algorithms. 

Now is the time to use this concept to provide a complete characterization of the OTA performance to  cover all real-life environments.  This is naturally done by introducing the pure LOS (Line-Of-Sight) as a complementing limiting edge environment, and by taking into account the statistics of the randomness introduced by users. The latter plays a major role in pure LOS that thereby rather becomes a random LOS environment.  The two limiting environments are linked together through a pragmatic real-life hypothesis, and work has started to test this by simulations.

It will be shown that the fundamental characterizing quantity becomes the probability of detection of single or multiple bit streams (for diversity and multiplexing cases, respectively) over an ensemble of users. This probability of detection becomes equal to a relative throughput in a multipath environment, readily seen through the simple threshold receiver model representing an ideal digital receiver.

The new approach represents a way to optimize the wireless networks by taking the statistics of users into account. This will be particularly important for the next Fifth Generation (5G) wireless systems, which will extend to higher frequencies at which the Random-LOS gets increased relevance and thereby importance too.  The Random-LOS OTA testing is already in 4G very relevant for automotive applications, and the tutorial will show the first verification of automotive Random-LOS experimental OTA test setups.

PSK: Introduction and basics of testing in RIMP and throughput modeling
CLP: Bluetest’s measurement procedures
PSK: Extending OTA testing in RIMP for 4G systems to Random-LOS in 5G systems
AAG: Automotive Random-LOS testing for 4G

 

About the Presenters


Professor Per-Simon Kildal (IEEE M’82-SM’84-F’95) has been Professor at Chalmers Uni­versity of Technology, Gothenburg, Sweden since 1989. He is now heading the Division of Antenna Systems at Department of Signals and Systems at Chalmers.

Prof Kildal received two best paper awards for articles published in the IEEE Transactions on Antennas and Propagation, and he was the recipient of the 2011 Distinguished Achievements Award of the IEEE Antennas and Propagation Society.

Kildal has authored an antenna textbook which is available as a free PDF from his ome page, and more than 150 journal articles and letters, most of them in IEEE or IET journals. He has designed two very large antennas, including the Gregorian dual-reflector feed of the Arecibo radiotelescope. He has invented several reflector antenna feeds, the latest being the so-called “Eleven antenna”.

Kildal is the originator of the concept of soft and hard surfaces, recently resulting in the gap waveguide, a new low-loss metamaterial-based transmission line advantageous in particular above 30 GHz. Kildal has received large individual grants from the Swedish research council VR and from the European Research Council ERC for research on gap waveguides.

His research group has pioneered the reverberation chamber into an accurate measurement tool for antennas and wireless terminals subject to Rayleigh fading. This has been successfully commercialized in Bluetest AB. 


Dr. Andrés Alayón Glazunov (IEEE SM’ 2011) is currently an Assistant Professor at the Department of Signals and Systems, Chalmers University of Technology, Gothenburg, Sweden. He obtained the M.Sc. (Engineer-Researcher) degree in Physical Engineering from Saint Petersburg State Polytechnical University, Russia, and the Ph.D. degree in Electrical Engineering from Lund University, Sweden, during 1988-1994 and 2006-2009, respectively. He has held various positions at research labs in the Swedish telecom industry, e,g., member of the Research Staff at Ericsson Research, Senior Research Engineer at Telia Research, and Senior Specialist in Antenna Systems and Propagation at TeliaSonera. In academia, he has held a Marie Curie Senior Research Fellowship at the Centre for Wireless Network Design (CWiND), University of Bedfordshire, UK, and a post-doc position at the Electromagnetic Engineering Lab, KTH-The Royal Institute of Technology, Stockholm, Sweden.

Alayón Glazunov has been one of the pioneers in establishing OTA measurement techniques. He has conducted, or is conducting research, in areas related to advanced receiver performance evaluation, applied electromagnetic wave propagation, stochastic channel modelling, smart and MIMO antennas and systems, network optimization, fundamental limitations on antenna-channel interactions, and Over-The-Air (OTA) performance evaluation of wireless devices. He has actively contributed to the European COST Actions 259 and 273. He has contributed to the EVEREST and NEWCOM European research projects as well as to the 3GPP and the ITU standardization bodies.

Alayón Glazunov is the author of various scientific and technical publications. He is the co-author and co-editor of LTE-Advanced and Next Generation Wireless Networks (Wiley 2012).

 

Christian S Lötbäck Patané received B.S. and M.S. degrees in Engineering Physics from Chalmers University of Technology in Gothenburg, Sweden in 2008 and 2010, respectively. For his Masters thesis work, he studied reverberation chamber measurement uncertainties and parameter estimations at the National Institute of Standards and Technology in Boulder, Colorado. In 2010, he began working at Bluetest, which is a company situated in Gothenburg, Sweden that develops and manufactures reverberation chambers for commercial use. Currently, he is working as an R&D engineer, developing hardware and measurement procedures for the reverberation chamber. He is also participating in standard organizations, such as CTIA and 3GPP, as a reverberation chamber expert.