Bob, how would this work with the SDR-1000 and Flex3000 considering they only have one RX? Are you using the Multi-Rx capability in PowerSDR and them applying the ESPRIT algorithms from the paper you referenced in this email??
73, Dennis Petrich Amateur Radio Station K0EOO Lakeville Minnesota USA k0...@arrl.net 952-898-1082 ----- Original Message ----- From: "Bob McGwier" <rwmcgw...@gmail.com> To: audio...@charter.net Cc: "FLEX USERS" <flexradio@flex-radio.biz> Sent: Tuesday, May 5, 2009 7:39:01 PM GMT -06:00 US/Canada Central Subject: Re: [Flexradio] Diversity Reception for Flex 5000 owners Jim: We can do this right now with a software receiver. We need to make the oscillators coherent in the same way we have done (in software). So this will be usable by SDR-1000 and Flex3000 owners. Good idea. I do not agree that the algorithm you suggest is the correct one but it will be the first one because it is easy. It will be applicable to HF broadcast very quickly. The algorithms based on MUSIC and ESPRIT are better suited, especially to the typical amateur installation where the elements are not identical and not spaced the correct distance apart. http://eprints.eemcs.utwente.nl/15144/01/final_report_Jasper_Vrielink.pdf http://www.springerlink.com/content/y8001q047g520398/ These algorithms allow for much more than two elements and are pretty efficient when only two elements are involved. My work partners and I are running a phased array with SDR design contract with a well known (not Flex) SDR hardware manufacturer and these algorithms will be part of the adaptive phased array work that must be done. Again, open source will benefit all. Happy Cinco de Mayo to all! http://twitpic.com/4mqnv We are about to embark on some SERIOUS adaptive algorithm development with DttSP, Flex, Gnuradio, etc. all involved. All of us will benefit. Jim Barber wrote: > Not being familiar with the architecture or sources, would there be > any value in developing a 2-input, LMS-style noise reduction scheme > using the same antenna for both receivers and a small frequency > offset? (RX2 would be tuned to an unoccupied "noise" frequency as > close as possible to the "active" RX1 operating frequency) > > That technique has been successfully used elsewhere and has the > advantage of adaptively canceling any static or long-term difference > in "phase" between the signals. (primarily group delay in this case?). > The obvious disadvantage is having to choose a suitable noise > frequency on a busy band, assuming one is available. > > Thoughts? > > Thanks, > Jim Barber, N7CXI > -- (Co)Author: DttSP, Quiktrak, PowerSDR, GnuRadio Member: ARRL, AMSAT, AMSAT-DL, TAPR, Packrats, NJQRP, QRP ARCI, QCWA, FRC. "You don't need to see the whole staircase, just take the first step.", MLK. Twitter:rwmcgwier Active: Facebook,Myspace,LinkedIn _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flex-radio.com/ Homepage: http://www.flex-radio.com/ _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flex-radio.com/ Homepage: http://www.flex-radio.com/
