Costas Loop

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A Costas loop carrier recovery module. The Costas loop locks to the center frequency of a signal and downconverts it to baseband. The Costas loop can have two output streams. There is a single optional message input. 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.


(R): Run-time adjustable

Loop Bandwidth (R)
Internal 2nd order loop bandwidth (~ 2pi/100)
The loop order, either 2, 4, or 8
Use or ignore SNR estimates (from noise message port) in measurements; also uses tanh instead of slicing.

Example Flowgraph

Insert description of flowgraph here, then show a screenshot of the flowgraph and the output if there is an interesting GUI. Currently we have no standard method of uploading the actual flowgraph to the wiki or git repo, unfortunately. The plan is to have an example flowgraph showing how the block might be used, for every block, and the flowgraphs will live in the git repo.

Source Files

C++ files
Header files
Public header files
Block definition