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OTA Performance Evaluation of MIMO Terminals with Multipath Simulator

Gao, Xiang LU and Wang, Xiaoguang (2010)
Abstract
With the ever growing requirement for higher data rates, terminals supporting multiple-input multiple-output (MIMO) technologies (or MIMO terminals) are being developed for the beyond-3G wireless communication systems such as HSPA and LTE. To ensure that the terminals are capable of delivering the promises of MIMO technology, test systems for the performance evaluation of MIMO devices are needed. In recent years, over-the-air (OTA) testing is adopted as a test system since it is a more realistic way of specifying terminal RF performance than the conventional conductive test method. Whereas the OTA test system for single-antenna terminals has been standardized, the test method for MIMO terminals is currently being developed.

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With the ever growing requirement for higher data rates, terminals supporting multiple-input multiple-output (MIMO) technologies (or MIMO terminals) are being developed for the beyond-3G wireless communication systems such as HSPA and LTE. To ensure that the terminals are capable of delivering the promises of MIMO technology, test systems for the performance evaluation of MIMO devices are needed. In recent years, over-the-air (OTA) testing is adopted as a test system since it is a more realistic way of specifying terminal RF performance than the conventional conductive test method. Whereas the OTA test system for single-antenna terminals has been standardized, the test method for MIMO terminals is currently being developed.

This thesis introduces a test method called Multipath Simulator (MPS) Method, which is one of the currently proposed methodologies for evaluating the OTA performance of MIMO terminals, and analyzes important aspects that need to be considered when this method is used in the development of a MIMO OTA test system. Channel model is one of the most important aspects for the MIMO OTA test system. Spatial channel models including SCM, SCME and WINNER models are described and compared in the thesis. Based on the analysis, a suggestion on the appropriate channel model is given.

According to the MPS Method, the MIMO OTA test system uses both multipath simulator (MPS) and spatial fading emulator (SFE) to generate spatial-temporal multipath propagation channels. To investigate the architecture of MPS and SFE which can satisfy the MIMO OTA test requirements, a MATLAB simulation system is developed. Based on the MATLAB simulations, simplification of the channel models that reduces cost and complexity of the test system is studied. Methods and criteria to simplify the channel models are also described. The configuration for the SFE such as the number of antenna probes and the effective test area are also studied through the simulation system. Lastly, the optimized configuration parameters for MPS and SFE are tabulated and the capacities for the given MIMO terminals in the chosen scenarios are plotted. (Less)
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author
organization
publishing date
type
Thesis
publication status
published
subject
keywords
OTA, MIMO, anechoic chambers, antennas, channel models, directional channels, clustered delay line model, Winner II channel model, over-the-air test
publisher
Lund University
language
English
LU publication?
no
id
2f63760c-990c-4a1c-843f-f5a45585971d
date added to LUP
2016-08-23 11:50:49
date last changed
2016-10-05 13:07:03
@misc{2f63760c-990c-4a1c-843f-f5a45585971d,
  abstract     = {With the ever growing requirement for higher data rates, terminals supporting multiple-input multiple-output (MIMO) technologies (or MIMO terminals) are being developed for the beyond-3G wireless communication systems such as HSPA and LTE. To ensure that the terminals are capable of delivering the promises of MIMO technology, test systems for the performance evaluation of MIMO devices are needed. In recent years, over-the-air (OTA) testing is adopted as a test system since it is a more realistic way of specifying terminal RF performance than the conventional conductive test method. Whereas the OTA test system for single-antenna terminals has been standardized, the test method for MIMO terminals is currently being developed.<br/><br/>This thesis introduces a test method called Multipath Simulator (MPS) Method, which is one of the currently proposed methodologies for evaluating the OTA performance of MIMO terminals, and analyzes important aspects that need to be considered when this method is used in the development of a MIMO OTA test system. Channel model is one of the most important aspects for the MIMO OTA test system. Spatial channel models including SCM, SCME and WINNER models are described and compared in the thesis. Based on the analysis, a suggestion on the appropriate channel model is given.<br/><br/>According to the MPS Method, the MIMO OTA test system uses both multipath simulator (MPS) and spatial fading emulator (SFE) to generate spatial-temporal multipath propagation channels. To investigate the architecture of MPS and SFE which can satisfy the MIMO OTA test requirements, a MATLAB simulation system is developed. Based on the MATLAB simulations, simplification of the channel models that reduces cost and complexity of the test system is studied. Methods and criteria to simplify the channel models are also described. The configuration for the SFE such as the number of antenna probes and the effective test area are also studied through the simulation system. Lastly, the optimized configuration parameters for MPS and SFE are tabulated and the capacities for the given MIMO terminals in the chosen scenarios are plotted. },
  author       = {Gao, Xiang and Wang, Xiaoguang},
  keyword      = {OTA,MIMO,anechoic chambers,antennas,channel models,directional channels,clustered delay line model,Winner II channel model,over-the-air test},
  language     = {eng},
  publisher    = {Lund University},
  title        = {OTA Performance Evaluation of MIMO Terminals with Multipath Simulator},
  year         = {2010},
}