Which modulation scheme are having constant energy

Which modulation scheme are having constant energy modulation?..

Answer / nawabumar(pakistan)

M-ary PSK modulation is constant energy scheme.
This can be proven looking at the constellation diagrams
which also reflec the energy relationships between differnt
points *
* | *
* | *
Though its not quite apparent from the fig. but the
distance of points from the centre(measure of energy
content) is same

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