dionysian
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I have a question concerning phase synchronization for QPSK signals. I am having a hard time finding information specifically on how you synchronize a quadrature signal. Meaning I have found a ton of resources on how you can use a PLL to lock onto a sinwave but if you have both a sin and cosine wave how can you perform the synchronization? I understand that if you were able to obtain synchronization to either the sine or cosine wave then it would be easy to generate a local oscillator that is 90 degree out of phase then demodulate the signal that way, but how would you lock on to either the sin or cosine wave in the first place if there is another signal 90 degree out of phase that is at the same frequency?
I have tried looking for information on this in a few books such as “Synchronization Techniques for Digital Receivers” by Mengali and “digital clokc for synchronization and communication” by masami kihara. But they don’t see to answer my question. If anyone could help me out or at least point me to a resource that would clear this issue up for me I would appreciate it.
I have tried looking for information on this in a few books such as “Synchronization Techniques for Digital Receivers” by Mengali and “digital clokc for synchronization and communication” by masami kihara. But they don’t see to answer my question. If anyone could help me out or at least point me to a resource that would clear this issue up for me I would appreciate it.