Paper Info
Title
MIMO Characterization on System Level of 5G Microbase Stations Subject to Randomness in LOS
Abstract
Wireless systems have become more and more advanced in terms of handling the statistical properties of wireless channels. For example, the 4G long term evolution (LTE) system takes advantage of multiport antennas [multiple-input multiple-output (MIMO) technology] and orthogonal frequency division multiplexing (OFDM) to improve the detection probability of single bitstream by diversity in the spatial and frequency domains, respectively. The 4G system also supports transmission of two bitstreams by appropriate signal processing of the MIMO subchannels. The reverberation chamber emulates according to previous works rich isotropic multipath (RIMP) and has proven to be very useful for characterizing smart phones for LTE systems. The measured throughput can be accurately modeled by the simple digital threshold receiver, accounting accurately for both the MIMO and OFDM functions. The throughput is equivalent to the probability of detection (PoD) of the transmitted bitstream. The purpose of this paper is to introduce a systematic approach to include the statistical properties of the user and his or her terminal, when characterizing the performance. The user statistics will have a larger effect in environments with stronger line-of-sight (LOS), because the angle of arrival and the polarization of the LOS contribution vary due to the user's orientation and practices. These variations are stochastic, and therefore, we introduce the term random-LOS to describe this. This paper elaborates on the characterization of an example antenna in both RIMP and random-LOS. The chosen antenna is a wideband microbase transceiver station (BTS) antenna. We show how to characterize the micro-BTS by the PoD of one and two bitstreams in both RIMP and random-LOS, by considering the user randomly located and oriented within the angular coverage sector. We limit the treatment to a wall-mounted BTS antenna, and assume a desired hemispherical coverage. The angular coverages of both one and two bitst- eams for the random-LOS case are plotted as MIMO-coverage radiation patterns of the whole four-port digital antenna system. Such characterizations in terms of PoD have never been done before on any practical antenna system. The final results are easy to interpret, and they open up a new world of opportunities for designing and optimizing 5G antennas on system level.
Year
DOI
Venue
2014
10.1109/ACCESS.2014.2358937
Access, IEEE  
Keywords
Field
DocType
4G mobile communication,Long Term Evolution,MIMO communication,OFDM modulation,antenna arrays,antenna radiation patterns,radio receivers,reverberation chambers,smart phones,transceivers,4G long term evolution system,5G microbase stations,BTS antenna,LOS randomness,LTE system,MIMO characterization,MIMO subchannels,MIMO-coverage radiation patterns,OFDM,PoD,RIMP,detection probability,frequency domains,line-of-sight randomness,multiple-input multiple-output technology,multiport antennas,orthogonal frequency division multiplexing,probability of detection,reverberation chamber,rich isotropic multipath,simple digital threshold receiver,smart phones,spatial domains,statistical properties,wideband microbase transceiver station antenna,Micro base transceiver station (uBTS),probability of detection (PoD),random line-of-sight (random-LOS),rich isotropic multipath (RIMP)
Multipath propagation,Wideband,Wireless,Multi-user MIMO,3G MIMO,Computer science,MIMO,Angle of arrival,Electronic engineering,Electrical engineering,Orthogonal frequency-division multiplexing,Distributed computing
Journal
Volume
ISSN
Citations 
2
2169-3536
2
PageRank 
References 
Authors
0.72
4
4
Name
Order
Citations
PageRank
Per-Simon Kildal152.52
Xiaoming Chen230128.67
Gustafsson, M.320.72
Zhengzhao Shen420.72