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
