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RF data communications headache

2006-03-12 by Thomas Keller

Greets.

   I have a headache.  I have a body-wearable electronics package, 
battery operated, which is generation on the order of 5 mbits/second of 
data which needs to be RF linked to a PC within 100-200 feet.  While 
there is no real reason the link itself needs to be an 802.11 link, 
utlimately, the data stream reaching the computer needs to be in TCP/IP 
UDP packets.  (I can handle generating the UDP packets at the recevier 
end of the RF link, if need be).

  My problem is getting the data from the body-wearable package TO a 
receiver. I have been looking at various solutions.  My personal 
favorite would have been Zigbee (IEEE 802.15.4) but the data bandwidth 
is simp;ly not there.  So, not finding anything else with sufficient 
bandwisfth and range, I find myself pretty much forced to lpook at 802.11.

   PROBLEM: how do I talk to an 802.11a/b/g WLAN adapter from an AVR?   
Should I choose a USB enabled AVR, and use a USB WLAN NIC?  Or should I 
try to use a PCMCIA or CF card WLAN adapter?   From what little I've 
been ab;e to find out, getting the necessary technival information to 
successfully communicate with and control PCMCIA and CF card adapters is 
difficult, at best.  (I also worry about the physivcal/electrical 
aspects of the interface).  I have plenty of bandwidth avai;labe in the 
AVR which will be cointrolling the RF card...only about 5% of 
itsresources are tied up in collecting the data stream from 4 uCs, each 
doing ADC on 32 channels of sensor data (2000 12 bit 
samples/sensor/second, total).  Going to implement a 16 bit data bus 
betwixt all the processors on the PCB (cheating, I know, but serial 
links just didn't look fesasible).

   So, what say ye, freinds and mentors?  Any suggestions, pointers to 
documents from which I can learn needed information/skills, criticisms, 
condemnations, proposals for committment, etc., etc?

tom
(aka avrFreak on eFnet IRC network)

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