Sunday, February 24, 2013

Wi-Fi continued..

Lets continue with the discussions about WiFi.

3 Key enabling technologies in 802.11n and 802.11ac

Why are 802.11n and 802.11ac drastically better than the previous versions/standards? As we disucssed in LTE, there are certain key enabling technologies. Lets discuss some of these here.

a. Extended channel binding
The bandwidths in ac are 80/160MHz facilitating higher data rates.

b. MIMO spatial streams
In case of 802.11ac upto 8 MIMO streams are supported.

c. Multi-user MIMO
I really find the concept of multi-user MIMO very exciting. Here in case of WiFi, multiple stations can receive and transmit data streams simultaneously.

d. Higher Modulation techniques 
Upto 256 QAM is supported in 802.11ac.

4. A peek into future

I was reading more about the future of WiFi, I came across an interesting presentation related to something called WiFi 3!! This is a technology developed by Edgewater Wireless.  Do read more on their website, I will just give a brief introduction to the same.

WiFi3 provides 50X performance improvement. They are using a multi channel (3) approach for the same. They are providing three channels on a chipset hence  giving higher throughput. They are promising better QoS and security as well.

WiGiG is an alliance for Gigabit WiFi, to support the increasing data rates, it is necessary to implement Gigabit WiFi.  The whitepaper on their website is a must read.
Here are some f the specifications they have metioned

1. Data transmission rates upto 7Gbps are supported.
2. Designed to support low power mobile devices.
3. Supports beamforming, maximizing signal strength.
4. Also supports high performance implementations like HDMI, DisplayPort, USB.

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