Re: [Discuss-gnuradio] Early Late Prompt Correlation and Costas Loop implementation

2009-05-28 Thread Mir M. Ali
Hi, I have another question regarding this. I sunk the output from the Costas onto FFTsink and got this. http://img172.imageshack.us/img172/9956/costasfft.jpg Are the peaks that appear on this the lower and upper sidebands of the data signal? I am transmitting using benchmark_tx.py (dbpsk). Thank

Re: [Discuss-gnuradio] Early Late Prompt Correlation and Costas Loop implementation

2009-05-28 Thread Mir M. Ali
Hi, I have another question regarding this. I sunk the output from the Costas onto FFTsink and got this. http://img172.imageshack.us/img172/9956/costasfft.jpg Are the peaks that appear on this the lower and upper sidebands of the data signal? Thanks, Ali On Thu, May 28, 2009 at 5:38 AM, Mir M. A

Re: [Discuss-gnuradio] Early Late Prompt Correlation and Costas Loop implementation

2009-05-28 Thread Mir M. Ali
Thanks a lot Tom for your help. I now understand how Costas loop operates. After all the tests that I did following your suggestions I was able to find the answer for a lot of my unanswered questions. Thanks again, Ali On Wed, May 27, 2009 at 10:42 AM, Tom Lutz wrote: > > I am using Flex-2400 b

Re: [Discuss-gnuradio] Early Late Prompt Correlation and Costas Loop implementation

2009-05-27 Thread Tom Lutz
> I am using Flex-2400 boards and the received signal is ideally at baseband > which in fact is not possible because, of various factors. Now, we have a > signal that has a center frequency 'fc' which is not 0Hz. Assuming the > costas to lock at this carrier I can achieve my goal. Isn't it right? >

Re: [Discuss-gnuradio] Early Late Prompt Correlation and Costas Loop implementation

2009-05-27 Thread Mir M. Ali
I am using Flex-2400 boards and the received signal is ideally at baseband which in fact is not possible because, of various factors. Now, we have a signal that has a center frequency 'fc' which is not 0Hz. Assuming the costas to lock at this carrier I can achieve my goal. Isn't it right? Can you

[Discuss-gnuradio] Early Late Prompt Correlation and Costas Loop implementation

2009-05-27 Thread Mir M. Ali
Hi Johnathan and other friends, I want to use an E/P/L Correlation (for Code synchronization) and Costas loop (for carrier phase sync) for Direct Sequence Spread Spectrum receiver based on this. http://img19.imageshack.us/img19/826/dsssrxr.jpg I have a doubt that needs to be cleared as I spent a