A Costas loop carrier recovery module. More...
#include <costas_loop_cc.h>
Public Types | |
| typedef boost::shared_ptr < costas_loop_cc > | sptr |
Static Public Member Functions | |
| static sptr | make (float loop_bw, int order) |
Detailed Description
A Costas loop carrier recovery module.
The Costas loop locks to the center frequency of a signal and downconverts it to baseband. The second (order=2) order loop is used for BPSK where the real part of the output signal is the baseband BPSK signal and the imaginary part is the error signal. When order=4, it can be used for quadrature modulations where both I and Q (real and imaginary) are outputted.
More details can be found online:
J. Feigin, "Practical Costas loop design: Designing a simple and inexpensive BPSK Costas loop carrier recovery circuit," RF signal processing, pp. 20-36, 2002.
http://rfdesign.com/images/archive/0102Feigin20.pdf
The Costas loop can have two output streams: stream 1 is the baseband I and Q; stream 2 is the normalized frequency of the loop
Member Typedef Documentation
Member Function Documentation
| static sptr gr::digital::costas_loop_cc::make | ( | float | loop_bw, |
| int | order | ||
| ) | [static] |
Make a Costas loop carrier recovery block.
- Parameters:
-
loop_bw internal 2nd order loop bandwidth (~ 2pi/100) order the loop order, either 2, 4, or 8
The documentation for this class was generated from the following file:
