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Re: [Discuss-gnuradio] bpsk Simulation
From: |
Axel Belliard |
Subject: |
Re: [Discuss-gnuradio] bpsk Simulation |
Date: |
Tue, 16 Mar 2010 10:18:32 +0100 (CET) |
User-agent: |
SquirrelMail/1.5.1 |
Salut!
I think our issues are related to the synchronizations parameters (Costa's
loop and M&M). It seems that they must be chosen very carefully,
especially costas_alpha and gain_mu.
In order to choose them, I plugged a constellation sink into my modulator
using GRC. As the constellation sink is using synchronisation algorithm, I
was able to play with the synchronization parameters and see the
consequences on the constellation.
I would like to learn more about these two algorithms. Where can I find
some interesting reading on the internet?
Eg : for a d8psk, with no gray coding I used : alpha= 0.001 and gain_mu=0.005
Axel