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Fan W.,University of Aalborg | Kyosti P.,Anite Telecoms Oy | Nielsen J.O.,University of Aalborg | Pedersen G.F.,University of Aalborg
IEEE Transactions on Vehicular Technology | Year: 2016

This paper discusses over-the-air (OTA) testing for multiple-input-multiple-output (MIMO) capable terminals with emphasis on wideband MIMO channel capacity analysis in a multiprobe anechoic chamber setup. In the literature, the spatial correlation simulation accuracy at the receiver (Rx) side has been used to determine the test area size for a limited number of probes. However, it is desirable that the test area size is defined in terms of data rate deviation of the simulated channel in the laboratory from that of the target channel model. This paper reports MIMO capacity analysis results for wideband spatiotemporal channel models, with emphasis on the impact of the spatial correlation at the transmit (Tx) side, the channel model, and the spatial correlation at the Rx side on the capacity simulation accuracy. Simulation results show that the number of probes is irrelevant to capacity simulation accuracy when the spatial correlation at the Tx side is in the high region (e.g., ρ > 0.7). Furthermore, when correlation at the Tx side is low, the spatial correlation accuracy is less critical with small correlation at the Rx side. The simulation results are further supported by measurements in a practical multiprobe anechoic chamber setup. The capacity simulation accuracy is shown to be a valid measure to determine the test area size. © 2015 IEEE. Source


Fan W.,University of Aalborg | Carton I.,University of Aalborg | Kyosti P.,Anite Telecoms Oy | Pedersen G.F.,University of Aalborg
IEEE Transactions on Antennas and Propagation | Year: 2016

This paper discusses virtual drive testing (VDT) for multiple-input multiple-output (MIMO)-capable terminals in multiprobe anechoic chamber (MPAC) setups. We propose to perform VDT, via reproducing ray-tracing (RT)-simulated channels with the field synthesis technique. Simulation results demonstrate that realistic RT channels can be accurately reproduced within the test zone with a limited number of probes in MPAC setups. The feasibility of performing VDT via reproducing RT-simulated channels is supported by measurement results in a practical three-dimensional (3-D) MPAC setup. The amplitude and phase of the electric field have been measured throughout the test zone with a calibration dipole, and excellent match between simulation and measurement was achieved. © 1963-2012 IEEE. Source


Fan W.,University of Aalborg | Jamsa T.,Anite Telecoms Oy | Nielsen J.O.,University of Aalborg | Pedersen G.F.,University of Aalborg
IEEE Antennas and Wireless Propagation Letters | Year: 2015

This letter discusses generating three-dimensional (3-D) spatial channel models with emphasis on the angular sampling methods. Three angular sampling methods - i.e., modified uniform power sampling, modified uniform angular sampling, and random pairing methods - are proposed and investigated in detail. The random pairing method, which uses only 20 sinusoids in the ray-based model for generating the channels, presents good results if the spatial channel cluster is with a small elevation angle spread. For spatial clusters with large elevation angle spreads, however, the random pairing method would fail, and the other two methods should be considered. © 2002-2011 IEEE. Source


Nurmela V.,Nokia Inc. | Kyosti P.,Anite Telecoms Oy
IEEE Vehicular Technology Conference | Year: 2014

In a future radio communication network various types of links will co-exist in the same area, and they need to be modelled consistently. We describe a channel modelling framework, which can consistently describe large and small scale phenomena of different types of links. The approach supports generation of spatially consistent radio channel realization also for cases where both link ends are moving like in device-to-device communication. Traditional cellular links and distributed antenna systems can be described with the same model, which allows a fair comparison between different types of transmission schemes. The main principle of the proposed framework is to create the propagation environment independently from the radios like in COST 2100 model. This is like simplified ray tracing without a map, i.e. without need of any detailed geometric or electromagnetic description of the environment as a prerequisite. The modelling principle and some examples of resulting radio channel statistics are simulated and presented. andcopy; 2014 IEEE. Source


Patent
Anite Telecoms Oy | Date: 2013-02-07

Apparatus comprises a receiver receiving wireless transmission of a real radio system from at least one base station of a radio system as a function of reception direction. The transmission comprises predetermined data. The apparatus comprises also a processing unit that forms taps of a delay profile on the basis of comparison between the data that is received and corresponding predetermined data. The processing unit estimates direction for the taps of the delay profile on the basis of a reception direction of the transmission, and forms radio channel data by associating the taps of the delay profile with the estimated direction. The radio channel data is for a radio channel model of a MIMO emulation in an OTA chamber having a plurality of antennas around a test zone where a device-under-test may be placed.

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