NDLI: MIMO Characterization on System Level of 5G Microbase Stations Subject to Randomness in LOS

Content Provider	IEEE Xplore Digital Library
Author	Kildal, P.-S. Xiaoming Chen Gustafsson, M. Zhengzhao Shen
Copyright Year	2013
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 bitstreams 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.
Starting Page	1062
Ending Page	1075
Page Count	14
File Size	68287239
File Format	PDF
ISSN	21693536
Volume Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	MIMO Wireless networks Next generation networking Mobile communication Statistical analysis OFDM Broadband antennas Reverberation chambers random line-of-sight (random-LOS) Micro base transceiver station (uBTS) rich isotropic multipath (RIMP) probability of detection (PoD)
Content Type	Text
Resource Type	Article
Subject	Computer Science Engineering Materials Science

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Optimizing small wideband antenna performance for both RIMP and random-LOS

Correction to “MIMO Characterization on System Level of 5G Micro Base Stations Subject to Randomness in LOS”

OTA characterization of μBTS antenna in RIMP and random-LOS

Characterization of Small Antennas & Wireless Devices for MIMO Systems in Rich Isotropic Multipath & Random Line-of-Sight

Preparing for GBit/s coverage in 5G: Massive MIMO, PMC packaging by gap waveguides, OTA testing in random-LOS

New approach to OTA testing: RIMP and pure-LOS reference environments & a hypothesis

Characterization of multi-antenna systems in RIMP and random-LOS environments using probability of detection of different bit streams

Measurements of throughput in reverberation chamber using universal Software Radio Peripheral

Diversity gains in random line-of-sight and rich isotropic multipath environment

MIMO Characterization on System Level of 5G Microbase Stations Subject to Randomness in LOS

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MIMO Characterization on System Level of 5G Microbase Stations Subject to Randomness in LOS