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[Discuss-gnuradio] Is it possible to fit modulation/demodulation, error


From: Andriy Brandis
Subject: [Discuss-gnuradio] Is it possible to fit modulation/demodulation, error handling and MAC protocol stuff on FPGA?
Date: Tue, 3 Mar 2009 12:09:44 +0000

Hi all
I'm doing the project on USRP, a digital data transmission system. I use RFX2400 daughterboard. I want to implement something like 802.11b/g system, but I would like to put all the modulation/demodulation work, error detection/correction and MAC protocol on FPGA, in order to make the system independent from PC. I will feed a data stream to the USRP and want to use the fastest rate possible, and I want the receiver to send only some sort of acknowledgement for the received packets (cumulative acks may be considered). The first question is, is it possible to fit such a program on USRP's Cyclone? As I understand, existing code takes almost all the space on FPGA, but it's possible to remove unused parts (for ex., I don't need all the channels) and free some space. Another question is which modulation technique will take least space while doing the job (i need at least 25 meters range)? And I also wonder if the multipath propagation will be a big problem?  If yes, is there an easy way to deal with it?
Any help will be appreciated! Thanx in advance for your answer

Andrey Brandis

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