On Wed, Mar 14, 2012 at 10:42 PM, Anh Duc Nguyen <ducn...@gmail.com> wrote:
> Hi all, > > I am a new one to GnuRadio. Now I am studying some implemented techniques > in GnuRadio, one of them is the digital clock recovery. I would like to ask > you a question that what are the reference documents or papers you used for > the interpolation filter in that task (digital clock recovery). When I > traced back the source files - digital_clock_recovery_mm_ff and > then gri_mmse_fir_interpolator, I found only a little information: > > * This implements a Mininum Mean Squared Error interpolator with 8 taps. > * It is suitable for signals where the bandwidth of interest B = 1/(4*Ts) > * Where Ts is the time between samples. > > I find it tough to understand the algorithm you selected, so could you > please help me on this problem. I make a guess with the key words " Mininum > Mean Squared Error", the implementation may have some link to those below > papers: > [1]. G. Watkins, “Optimal Farrow coefficients for symbol timing > recovery,” *IEEE Communications Letters*, vol. 5, no. 9, pp. 381–383, > Sep. 2001. > [2] Daeyoung Kim, M. J. Narasimba, and D. C. Coc, “Design of optimal > interpolation filter for symbol timing recovery,” IEEE Transactions on > Communications, vol. 45, no. 7, pp. 877–884, Jul. 1997. > > I would like to thank you very much in advance, > > With best regards, > > Nguyen Anh Duc > I'm afraid that's before my time. I'm not sure we have the corporate knowledge on that anymore. If you find a good paper to describe it, let me know and I'll put it into the documentation like we've done elsewhere. Thanks, Tom
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