OTA Throughput Testing of Multi-Antenna Terminals by using StarMIMO Test Range A.Scannavini * , L.J.Foged * , N.Gross + * SATIMO Italian Office Via Castelli Romani, 59 00040 Pomezia Italy ascannavini@satimo.com, lfoge@satimo.com + SATIMO Main Office 17, Avenue de Norvegè, 91953 Courtaboeuf Cedex, France ngroos@.satimo.fr Abstract— This paper gives an overview of the SATIMO StarMIMO test range. It is based on the well–documented Spatial Fading Emulation technique [1-2] for OTA measurements of multi-antenna terminals, and MIMO based devices. Throughput versus channel model power of HSDPA RX Diversity capable devices is presented. The reported measurement campaign is part of the 3GPP/COST2100 MIMO OTA round robin testing activity [3-4]. Comparison of Throughput results when using different channel models is also highlighted. I. INTRODUCTION The SATIMO StarMIMO test range is composed of 24 dual polarized probes placed on a horizontal full circle. The probes are evenly spaced each 15 degrees and the radius of the test range from probe to DUT is 1.2m. For the conducted testing campaign only 8 probes, each 45 degrees spaced have been used with just vertical polarization being connected to the channel emulator’s outputs. Figure 1 shown the test range block diagram where the probes’ numbering has been chosen according to the channel emulator mapping algorithm to the 8 probes in order to emulate at the center of the arch a spatial channel models with SCME settings in terms of Power-Delay- Profile (PDP), doppler spread, delay spread, and angular spread (AS) [4]. Fig. 1 Block Diagram of the SFE set up The R&S CMu200 has been used as Node-B emulator in order to emulate an HSDPA radio link. The downlink signal from the Node-B emulator goes into the channel emulator and via an amplifiers rack to the 8 probes. Due to the fact that testing must be done when a call has been established between the DUT and Node-B emulator the loopback is done by using a so called “link” antenna placed in the turning table. The StarMIMO test range is shown in Figure 2 with a laptop type AUT. Fig. 2 SATIMO StarMIMO test range II. CALIBRATION, AND POWER MEASUREMETS Before starting any measurements with the above mentioned set up, calibration and average channel power measurements must performed by using a reference antenna placed in the center of the test set up. We used for both the checking a precision sleeve dipole centered at 2140MHz. A. Calibration Attenuation from Node-B emulator output to the DUT location through each path was measured using Agilent PNA network analyzer and a SATIMO SD2140 vertical dipole. Figure 3 shows the gain versus azimuth for the used SD2140 dipole. Symmetry is within +/-0.1dB at 2112.4MHz. channel emulator communication tester EUT 7 6 5 4 3 2 1 8 Link antenna Copyright © 2011 IEEE. Reprinted from Proceedings of 2011 EUCAP conference. This material is posted here with permission of the IEEE. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.