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


From: Paul M. Bendixen
Subject: Re: [Discuss-gnuradio] Costas loop and M&M algorithm on FPGA
Date: Thu, 15 Dec 2011 09:59:59 +0100

Hi Phone

No, but I am very interested :D
From your original post it might seem that fresh eyes might hit the spot.
I'm more of a VHDL guy, so I might not be too much of a help.
I just thought that others might have a better chance of helping if they could see the code.

Best
Paul

2011/12/15 Phone Naing MYINT <address@hidden>

Hi Paul,

 

I do not have one. Do you implemented them before?

 

PN

 

From: discuss-gnuradio-bounces+phonenaing.myint=address@hidden [mailto:discuss-gnuradio-bounces+phonenaing.myint=address@hidden] On Behalf Of Paul M. Bendixen
Sent: Thursday, December 15, 2011 4:48 PM
To: GNURadio Discussion List
Subject: Re: [Discuss-gnuradio] Costas loop and M&M algorithm on FPGA

 

Hello Phone

 

Do you have a git repo that one might throw in ones two coppers?

 

Best

Paul

 

2011/12/15 Phone Naing MYINT <address@hidden>

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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