Hi Phil:
> Date: Thu, 15 Jun 2017 12:57:54 +
> From: Phil Frost:
> I am working on a receiver for the amateur radio mode PSK31[1]. It's BPSK
> where the pulses are a raised cosine (impulse, not frequency domain) twice
> the symbol duration[2], no error correction, at 31.25 baud. The transmitt
I had messed with psk31 a while back. There's a gnuradio module to decode
and some example GRC's to send and receive that I had used here:
https://github.com/tkuester/gr-psk31 that may help you out. The flowgraphs
in the examples directory already have all the blocks set up to receive.
On Thu,
Do you mean the equalization would be performed with another linear filter?
matched filter -> equalizing filter -> clock recovery -> [...]
Wouldn't that be equivalent of convolving the input responses of the two
cascaded FIRs, with the net result being an unmatched filter?
Existing implementatio
Hi,
Nice problem you got there. In any case, have you considered performing
matched filtering (thus maximizing SNR), outputting more than one sample
per symbol (in fact, without decimation at all), then equalize (so that the
signal looks as if it was sent and received with a squared-root Nyquist
pu
I am working on a receiver for the amateur radio mode PSK31[1]. It's BPSK
where the pulses are a raised cosine (impulse, not frequency domain) twice
the symbol duration[2], no error correction, at 31.25 baud. The transmitted
signal has no ISI, but after matched filtering it does:
[image: 0SDEq.png
