Abstract
We present four new developments for a multiple-input multiple-output (MIMO) over-the-air measurement system based on our previous studies. The first two developments relate to the channel model for multipath environment generation. One is a further simplification of the circuit configuration without performance degradation by reducing the number of delay generation units, which dominate the performance limit when implementing the circuit on a field-programmable gate array (FPGA). The other is to realize spatial correlation characteristics among the input ports on the transmission side, whereas the previously proposed channel model did not consider this correlation. The third development involves the details of implementing the MIMO fading emulator on an FPGA as a two-stage scheme. The fourth is the demonstration of application examples of the developed system.
Highlights
In recent years, as the speed and capacity of information communication technology have grown, multiple-input multipleoutput (MIMO) transmission schemes have become a key technology for mobile radio systems
By applying the technology cultivated in this fading simulator development, an extremely sophisticated fading emulator (FE)-type MIMO-OTA measurement system was proposed in [5] based on the path-controlled configuration shown in Figure 3(a) composed of ML links
The novelty of this paper based on the above-mentioned previous works is summarized as follows: (i) Further simplification of the configuration of the signal-processing unit, that is, the “advanced antennabranch-controlled method”: this scheme can drastically reduce the number of delay units in the L × M connection matrix, which achieves L = 32 probe antennas with 8 delay paths varying up to 200 μs (ii) Incorporation of the TX-side spatial correlation property to realize the propagation characteristics around the base station site (iii) Implementation of two-stage MIMO-FE on an field-programmable gate array (FPGA) incorporating the functions of (i) and (ii) above (iv) Evaluation and demonstration of effectiveness in a wireless local area network (WLAN) and terrestrial digital broadcasting reception
Summary
As the speed and capacity of information communication technology have grown, multiple-input multipleoutput (MIMO) transmission schemes have become a key technology for mobile radio systems. Various means of constructing MIMO-OTA measurement systems have been proposed and discussed in the 3rd Generation Partnership Project (3GPP) and other forums for the standardization of mobile communications [2] Of these MIMO-OTA measurement systems, one type is a field emulation system, which is used to produce a multipath fading environment around the DUT by surrounding the terminal with multiple probe antennas [3,4,5,6,7,8,9]. When measuring DUT performance using a MIMOOTA system, it is necessary to construct a complicated experimental setup in a large radio anechoic chamber with a number of probe antennas To simplify these measurements, a two-stage method has been proposed [14]. The third development is implementation of the proposed system on an FPGA incorporating the two-stage scheme, and the fourth is to show application examples of the developed system
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
