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Re: [Discuss-gnuradio] implement d8psk on benchmark_tx.py

From: Daniel Steven
Subject: Re: [Discuss-gnuradio] implement d8psk on benchmark_tx.py
Date: Mon, 16 Feb 2009 17:15:18 -0800 (PST)

Great Smart GUY!

So, what is the obstacle for us to implement QAM demodulator? Is that because of the carrier tracking or symbol synchronization? We really wish to sort that problem out and get QAM running on USRP!!!


Best Regards!


From: George Nychis <address@hidden>
To: Daniel Steven <address@hidden>
Cc: address@hidden
Sent: Monday, February 16, 2009 7:05:23 PM
Subject: Re: [Discuss-gnuradio] implement d8psk on benchmark_tx.py

Hello, Tianning/Bill/Daniel!

The performance of 8PSK matches pretty similarly to 16-QAM.  So, 8PSK is usually never used in a real system as you get better spectral efficiency with 16-QAM without taking a huge hit in required SNR.

- Rick Stevens

Daniel Steven wrote:
> Hello, guys!
> We are using the file, benchmark_tx.py residing in the directory of python/digital to do some researches. We found that gmsk, dbpsk and dqpsk are the supported modulation schemes for that file, but d8psk is not the supported modulation technique. Is there any reason for the absence of d8psk? Is that because carrier tracking is very difficult for d8psk? We wish to sort that problem out and get d8psk to work! Thanks a lot!
> Daniel
> ------------------------------------------------------------------------
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