Re: [Discuss-gnuradio] gmsk error

[Eric Blossom]

On Tue, Dec 06, 2005 at 03:57:26PM -0500, address@hidden wrote:
> What are the parameters/arguments (omega, gain_omega, me, gain_mu...) used
> in gr_clock_recovery_mm_xx and how do you determine what they should be?

Quick answer: 

  use the defaults.

Involved answer: 

  It's a Mueller and Müller (M&M) discrete-time error-tracking synchronizer.

  See "Digital Communication Receivers: Synchronization, Channel
  Estimation and Signal Processing" by Heinrich Meyr, Marc Moeneclaey, & Stefan 
Fechtel.
  ISBN 0-471-50275-8.

> I have been trying to find in the Python literature what the follow syntac
> represent.
> 
>         """
> ...
>         @param omega: nominal relative freq (defaults to spb)
>         @type omega: float
>         @param gain_mu: controls rate of mu adjustment
>         @type gain_mu: float
>         @param mu: fractional delay [0.0, 1.0]
>         @type mu: float
>         @param omega_relative_limit: sets max variation in omega
>         @type omega_relative_limit: float, typically 0.000200 (200 ppm)
>         @param freq_error: bit rate error as a fraction
>         @param float
>       """
> 
> Is this some type of preprocessro directive?

This is "epydoc" format.  http://epydoc.sf.net

Eric