A class of constant envelope multi-dimensional modulation schemes for non-linearly amplified channels

A new class of modulation schemes, called 8D-CEMS (8 dimensional constant envelope modulation scheme), with constant envelope of the modulated signal, for digital radio communications over non-linearly amplified channels is introduced. Computer simulation results show that these modulation schemes lead to significant performance improvement on non-linearly amplified channel, as required in most commercial satellite and terrestrial microwave systems. In particular, we show how to generate an 8D-CEMS that allows one to achieve a bit-error rate of P_be=10^-4 at E_b/N₀=9 dB with spectral efficiency 3 bits/s/Hz