Cohda-Enhanced 802.11
Cohda has designed unique receiver side PHY signal processing that overcomes both the long delay spread associated with outdoors and/or NLOS deployments, and mobility problems even when they occur simultaneously. The waveforms employed are 802.11 compliant. No modifications are made at the transmitter.
In the field, the coverage is improved considerably as the Cohda radio can process signals perturbed by simultaneous multipath and mobility.
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Relative to existing technologies these techniques result in
- An increase of up to 10 dB in receiver sensitivity.
- An ability to provide coverage for 802.11 in long delay spread environments such as those encountered in Municipal and Public Safety deployments.
- An ability to maintain links, while at speeds in excess of 200 mph, in typically encountered Non-Line-Of-Sight conditions.
- An increase in reliable transmission range of 75%.
- Increased coverage into notorious black-spots as encountered in urban canyons.
- Increased robustness to interfering radio signals such as 802.11, 802.16 or any other inband transmitter.
Performance consistent with that obtained indoors is provided in harsh NLOS outdoor environments for speeds of 200mph or more. Finally deployment economics are significantly impacted since saturating an area with LOS access points is no longer required.
Further detail regarding the outdoor mobile 802.11 problems and Cohda's solutions are available in our whitepapers.