Hey Alfredo, cool stuff with the Turbo Code :)
If you want to read more on general turbo code principles I suggest Hanzo's Book on Turbo Codes /EQ http://www-mobile.ecs.soton.ac.uk/comms/files/fec-book-updtd.pdf Turbo Codes start at Page 21. I implemented the 8-state RSC code from LTE as single MAP Decoder in my Master's thesis and I found this pretty helpful: http://www.etsi.org/deliver/etsi_ts/136200_136299/136212/11.01.00_60/ts_136212v110100p.pdf Coding starts at page 11. Hope this can help you. See you at GRCON! -Jan 2014-07-25 7:02 GMT+02:00 Alfredo Muniz <[email protected]>: > Thanks for your response Tom. I've been told you are the one to talk to > about LTE stuff. > > On Thu, Jul 24, 2014 at 9:19 PM, Tom Tsou <[email protected]> wrote: > >> Any >> thoughts on the next milestone? >> > > Currently I have everything working on the DSP through a compiled program > that I load onto the DSP from the ARM. I would now need to send data > between the ARM and the DSP so that we can interface with GNU Radio. I have > a couple of options MessageQ, Msgcom, and CMEM. The plan is to simply pass > a pointer with all the log-likeihood ratios on the ARM side so that the DSP > can process it and then get the pointer to the resulting hard decisions > back to the ARM. Once I can test that this works the next step would be to > get the data from GNU Radio. > > > On Thu, Jul 24, 2014 at 9:19 PM, Tom Tsou <[email protected]> wrote: > >> If you are sticking with LTE decoding, the outer portions of the >> receiver (OFDM, precoding, etc.) are probably out-of-scope for this >> project >> > > Yeah I don't know much about LTE decoding. The TCP3d is capable of > operating in three modes: LTE, WiMax, and 3GPP. If one is easier to work > with on the DSP side than another please let me know as the TCP3d simply > does turbo decoding. It takes in LLRs and outputs the hard decisions though > it can also give other things like soft decisions. > > On Thu, Jul 24, 2014 at 9:19 PM, Tom Tsou <[email protected]> wrote: > >> do you think it would be possible to attach and >> manipulate the Bit Rate Coprocessor (BCP)? >> > > The BCP operates through the same means as the FFTC using the QMSS and > CPPI. It is definitely possible but I think I've spent enough time on it > for this summer. I will definitely revisit this issue once I have something > more substantial to present for the conference. > > On Thu, Jul 24, 2014 at 9:19 PM, Tom Tsou <[email protected]> wrote: > >> Those are just random thoughts. If you need captures, myself or some >> of the other LTE folks can probably provide live (or canned) signals >> at various test points. >> > > Thanks. Any resources to understanding the DSP theory would be helpful and > your recommendation on whether to pursue LTE, WiMax, or 3GPP. I'm hoping to > be at the point where I need to produce live data sometime late next week. > Thanks again! > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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