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WiMAX™ Implementation of MIMO

Mobile WiMAX™ is based on the IEEE 802.16e standard but is evolving in waves as it overcomes market limitations. Wave 2 products include MIMO (Multiple Input, Multiple Output) techniques. The techniques used with the smart antenna technology of MIMO makes it possible to put more data into a wireless connection and extend the range. It is expected that Mobile WiMAX with MIMO will be able to carry approximately 4x more traffic than today’s 3G networks. In this case, wireless video becomes more realistic. The unique aspect of the MIMO implementation is the use of OFDMA. In OFDMA user data bursts overlap in time. This maximizes data flow in a complex environment.

  Figure 1. OFDMA burst structure.
  OFDMA Burst Structure

At any one point in time, there is data from multiple bursts available on different subchannels, as shown on the Y axis of Figure 1. These subchannels are logical arrangements of subcarriers, not physical arrangements of subcarriers. Therefore, adjacent subcarriers may actually belong to different subchannel groupings and be different modulation formats. While each data burst may only use one modulation format, adjacent subcarriers may have different modulation formats. And because each burst is unique, the pilot locations will be at many different subcarrier locations. The end result is a complexity not found in OFDM.

The complexity drives more sophisticated testing. Agilent is on the forefront of this testing. Accelerate Wireless Design and Test with Flexible, High-Performance Platforms

Sources: Agilent Webinars, Wikipedia, wi-fiplanet.com

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MIMO RF Signal Analysis and Generation Test Systems and SW with V2895A MIMO Synchronization Unit 
The flexible MIMO RF signal analysis and generation systems/software allow for any MIMO configuration up to 8x8 for MIMO-ready vector signal generators/analyzers using the MIMO synchronization unit.

Technical Overview 2010-05-19

MIMO Measurement Tips with Agilent P-Series Power Meters and U2000 Series USB Power Sensors 
This application note provides an overview of MIMO, and shows the steps of performing an accurate and repeatable MIMO power measurement by using USB sensors or P-series power meter and sensors.

Application Note 2009-01-20

Mobile WiMAX™ PHY Layer (RF) Operation and Measurement 
This application note describes the operation and physical layer measurements of 802.16e OFDMA Mobile WiMAX devices.

Application Note 2008-07-17

PDF PDF 7.84 MB
MIMO Wireless LAN PHY Layer (RF) Operation & Measurement Application Note 1509 
This application note is intended to provide an understanding of MIMO radio operation as it applies to WLAN, and the test configurations for multi-channel radios.

Application Note 2008-04-30

WiMAX Design and Test Tools 
This flyer introduces Agilent’s WiMAX (802.16-2004) design and test tools used to efficiently and effectively simulate, troubleshoot, and verify WiMAX component, subsystem, or system designs.

Promotional Materials 2006-09-14

PDF PDF 1.55 MB
WiMAX Signal Analysis Part 1: Making Frequency and Time Measurements Application Note 
This application note is the first in a 3-part series that presents an approach to WiMAX (802.16-2004) signal analysis that yields the greatest level of understanding and reliability in measurements.

Application Note 2005-07-05

PDF PDF 714 KB