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.|
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. Greater insight. Greater confidence. Accelerate next-generation wireless.
Sources: Agilent Webinars, Wikipedia, wi-fiplanet.com
Refine the List
By Type of Content
By Product Category
1-3 of 3
Fading WiMAX™ testing with Agilent's E6651A and an Elektrobit Propsim C8
This application note describes how to perform receiver testing in a faded environment with the E6651A Mobile WiMAX test set, the N6422C Wireless Test Manager software and a channel emulator
Application Note 2009-12-07
PDF 788 KB
MIMO Manufacturing Solution Application Note
Compares two of the most popular MIMO manufacturing test methodologies, including examples to illustrate the relative merits.
Application Note 2007-07-10
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 7.84 MB