Re: [Discuss-gnuradio] Costas loop and M&M algorithm on FPGA

On Fri, Dec 16, 2011 at 3:09 AM, Phone Naing MYINT <address@hidden> wrote:

Hi Bob,

Your guess is correct, I found the error from Transmitter side. Now the synchronization is working fine.

PN

From: Robert McGwier [mailto:address@hidden]
Sent: Thursday, December 15, 2011 8:53 PM
To: Phone Naing MYINT
Cc: address@hidden; address@hidden
Subject: Re: [Discuss-gnuradio] Costas loop and M&M algorithm on FPGA

At high SNR, a single bit is probably enough in the detector and 15 bits in the phase accumulator is also likely more than enough. The error, in my opinion, is elsewhere.

Tell us about your work here please:

https://www.cgran.org/

after you have set up your git repository here:

https://github.com/

and here are some useful instructions

http://gnuradio.org/redmine/projects/gnuradio/wiki/DevelopingWithGit

Thanks, in advance, for sharing

Bob

On Thu, Dec 15, 2011 at 1:52 AM, Phone Naing MYINT <address@hidden> wrote:

Hi,

Anyone here implemented freq/phase correction and symbol timing correction in USRP’s FPGA?

Recently I implemented Costas loop and Muller & Mueller algorithm in RTL by referring the gnuradio code. Now I’m testing it on FPGA. I can get correct demodulated data(DQPSK) at initial few thousand symbols. After that I’m getting all rubbish data.

I think the problem with my RTL implementation is not good enough bit-resolution (unlike implementation on PC). Currently I’m using 15-bits resolution for decimal part. Anyone has any suggestion ?

PN

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From:	Robert McGwier
Subject:	Re: [Discuss-gnuradio] Costas loop and M&M algorithm on FPGA
Date:	Fri, 16 Dec 2011 07:57:53 -0500