On 05/11/2012 06:00 AM, Brian Morrison wrote:
Yes, but PSK has a phase trajectory straight through the origin of the vector diagram, which is why Pi/4DQPSK with even and odd symbols at 45 degree offset came into being to reduce the large amplitude variation.The point here is that we should be using a modem with frequency transitions only on VHF/UHF, if we want the best use of our power budget. For this choice, though, we would suffer a lower spectral efficiency, and potentially a worse bit-error-rate for a given noise level than we would have if we could support a PA with lots of headroom.
The reason that SSB transmission is in general not offered on HTs is that much of the power of a linear PA ends up being turned into heat.
Thanks
Bruce
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