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Hometown:: Kerala

Country:: Singapore

Current Job Title: Senior Engineer

Favorite Site:: http://www.drtonygeorge.com

One Thing You Want People to Know About You:: Hardware implementation of Physical Layer

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At 6:23pm on August 4, 2008, Bob Ehlers said…: Tony, actually we are using the 802.11 phy as implemented by Atheros in their AR500x series of ASIC. Using a commodity part like this allows us to have much better economics for our markets. Atheros is driven by laptop economics, so we get really inexpensive parts to work with.

Basically the issue that we have seen with moving to WiMAX is not one of technology, but rather implementation. Everyone is chasing the telco market and trying to deliver asymmetric service with fast forward channel. Video for surveillance and broadcast production needs a fast return channel. Most WiMAX implementations put an expensive FPGA in the base station (BSN) and cheap ASICs at the CPE. For instance look at Alvarion who just announced the major price breakthrough of $24k for a base station that can support 200 subscribers. They pair this with a WaveSAT client adapter that costs $200 for CPE.

Unfortunately we have found that the CPE equipment cannot support the return channel bandwidth that our customers need and they cannot be used as base station, due to the design which requires that they are slaves.

The WiMAX MAC and PHY are both well designed for video surveillance, but the implementation is not.

So we looked to use commodity parts that we can make some simple mods to. This can be summarized as disabling CSMA/CA in the Atheros chips and replacing it with polling/time slicing. This creates a deterministic timing environment that video can live with. It allows us to scale much farther than WiFi and yet keep the economics under control.

We have wireless nodes that cost as little at $500, but are capable of being 80% spectrum efficient, compared to WiFi at 60%, so we can get over 40Mbps actual throughput on a 20MHz OFDM channel, with no jitter. Give us 40MHz and we can get upwards of 81Mbps (both point to point...point to multipoint varies by number of client nodes).

Anyway, if you have any questions, I would be happy to answer, but I don't see us spending the money on developing a PHY, as it would not fit our economic model.

At 7:59am on August 4, 2008, Harsh Pangi said…: Hey Tony:

I'm was into Wimax Base Station signal chaion development. now am something that does not interest me. I'm looking for a change and look forward working back with Wimax/LTE

At 6:54am on August 4, 2008, Umesh Satija said…: Tony,

Thanks for becoming a member at 4gwirelessjobs.com. However, it is still in development stage- would not take more than a week.I would advise you to check back in some days more.

Best Regards,

Umesh Satija