Thanks Glen, food for thought.... On 04/02/17 11:02, glen english wrote: > ham systems , that are SNR limited, not bit rate limited, will ALWAYS be > a better bet with a constant envelope signal, compared to a linear > signal (non constant amplitude signal) in terms of power output power > amplifier UTILIZATION. Utilization is the key here..... > > for systems that need to push a large bit rate through a narrow channel, > there is little option but a QUAM signal. > > There is no disadvantage of a constant envelope signal compared to a > linar signal with regards to multipath protection, mitigation, dopplers > etc PROVIDING THAT the signal chain is linear on receive. > > That is to say, after limiting a signal, information has been thrown away. > > So, not to get confused with a constant envelope signal with FM demod. > results are poor compared to using a linear demod. > ********** > > David, it is worth a look at GSM > > GSM has a training sequence each frame and deals with multipath (up to > the training length) very well. multipath can improve the SNR. > > constant envelope, non linear TX, linear RX. > > > g > > > > On 4/02/2017 10:37 AM, David Rowe wrote: >> Thanks Steve, there was error in the > > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 >
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