communications

This is my first Chapter on my own WiMAX RF Engineer self learn. As I mentioned before in my post this first chapter contains Module 1material:

6 WiMAX Applications (after walking around the web, I found an interesting material from Intel)

On the picture above there are 6 applications and it’s architecture which is grouped in to three items:

1. Access (Appropriate standards: 802.16d-2004 and 802.16e)

• Fixed Outdoor
• Backhaul

2. Portability (Appropriate standard: 802.16e)

• Nomadic Metrozone
• Fixed Indoor
• Enterprise, Campus Piconet

3. Mobility

• Mobile Application

Standards Specification

Spectrum availability, there are two kind of spectrum frequency:

• Licensed Spectrum
• Unlicensed Spectrum

• • From picture above we can conclude, WiMax Main RF Bands are: 2.3 GHz, 2.4 GHz, 2.5 GHz, 3.5GHz, 5.8 GHz, and (maybe) 700 GHz.

802.16e Standard Enhancement.

First WiMax standard was published in April 2001 and completed in October 2001. And as amendment 802.16a was approved in 2003. After 2003 the standard development continuous and breed 802.16d in 2004. And then in 2005, 802.16e was approved and add the mobility to the standard.

So what is the different between 802.16d and 802.16e? Well… let me show you what I’ve got

• 802.16d
  1. NLOS application and indoor CPE are supported.
  2. Beam forming Antenna
  3. OFDM Subchannelization
  4. FBWA Technology (wireless DSL Alternative)
• 802.16e (called “Mobile WiMax)
  1. Supports Portable BWA
  2. Operated on 2.3 GHz, 2.5 GHz and 6 GHz
  3. Handoff and Roaming Support
  4. Scalable OFDMA, OFDMA with subchannelizatoin

From the brief introduction above, we can conclude that 802.16e enhancement is about mobility, as we can see it supports Portable BWA, Handoff and Roaming.