Re: [Discuss-gnuradio] FIR filters and set_history()

[George Nychis]

George Nychis wrote:
> Using the FIR with time reversed complex conjugate of the desired input 
> signal:
> http://cyprus.cmcl.cs.cmu.edu/matched_filter/graphs/mf_fir_conjugate.jpg
>
> Using the "matched filter block" that uses the complex/real-wise inner 
> product:
> http://cyprus.cmcl.cs.cmu.edu/matched_filter/graphs/mf_block.jpg
>
> The FIR filter method seems to have much better properties, creating a 
> much larger magnitude in the output.

This is probably a much better comparison:
http://cyprus.cmcl.cs.cmu.edu/matched_filter/graphs/mf_compare.jpg

The difference between what I would consider the maximum noise level of 
the inner product method and the correlation peak is: 160-45=115

For the FIR filter, 225-75=150.

Just approximations.

- George