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Azimuth unveils WiMAX channel emulator

Posted: 06 Feb 2007     Print Version  Bookmark and Share

Keywords:WiMAX  emulator  MIMO  Azimuth  SISO 

Azimuth Systems' ACE 400WB provides sophisticated channel modelling capabilities and enables real-time performance testing of multiple-input-multiple-output (MIMO) devices.

The ACE 400WB tests MIMO and single-input-single-output (SISO) WiMAX solutions by accurately emulating the multi-path characteristics with channel correlation to determine the effect of multi-channel RF interactions. Advanced signal processing technology automates device control, traffic capture and results display to deliver accurate, repeatable and fast results. The ACE 400WB can be used to test and debug MIMO algorithms, optimise the performance of WiMAX devices in MIMO and SISO environments, streamline QA processes and run competitive performance benchmark tests.

It also tests interoperability between MIMO and SISO implementations from multiple vendors and can be used to define industry-wide mobility performance test suites for future WiMAX products.

Performance prediction
In next-generation MIMO systems for both Wi-Fi and WiMAX technologies, multi-path emulation with correlated channels is required to determine whether MIMO algorithms are working properly and to predict performance of MIMO-based products in a real-world environment.

However, multi-path is difficult to predict and control because it is affected by everything from building construction to the movement of people, so accurate channel emulation is a critical element of any MIMO test bed. The ACE 400WB delivers the real-world environment to a lab, offering unprecedented RF control to enable efficient and repeatable results, while replacing time consuming wireless field tests that lack repeatability.

The ACE 400WB's features include:

  • Fully functional channel emulation that scales from SISO 1x1 devices to MIMO 4x4 devices, to measure RF interactions between devices with up to four I/O antennas;

  • Single-box design (with inherent RF), reducing the need for daisy chaining, synchronising multiple boxes and eliminating the need for external hardware;

  • Dedicated bidirectional channel modelling that emulates wireless over-the-air conditions in downlink and uplink paths, which can be used to test beamforming applications;

  • Complete RF isolation and high performance ensures repeatable test results that are not limited by the fidelity of the channel emulator;

  • Built-in ITU M.225 Pedestrian B and Vehicular A channel model profiles that allow users to recreate a variety of typical WiMAX scenarios for performance and interoperability testing;

  • Dynamic, real-time channel modelling with channel play/pause/rewind control, as well as practically infinite model repeat times, to enhance debug capabilities; and,

  • Expert Mode operation that allows the user to program the emulator with custom channel models to allow in-lab emulation of user-defined real-world environments.

- Jack Shandle
Wireless Net DesignLine

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