| 摘要 |
The invention relates to a method for the continuous phase multi-state modulation of digital data, said data being complex symbols carrying at least one information bit, and having a theoretical constellation that comprises a number of states N at least equal to 2, wherein said method comprises at least the following steps: recovering the symbols a(n) of digital data to be transmitted, said data symbols being in the form of a symbol sequence; applying to said symbols a(n) a delay of a duration K (30) in order to obtain a delayed-symbol sequence; applying to the delayed-symbol sequence the step of combining (31) coefficients w(i), that provides at the output a converted sequence b(n) obtained by combining said delayed symbols between them; modulating the symbol sequence b(n) by a continuous-phase modulation method using a pulse response h(t) filter (32) and a frequency modulator (33) in order to obtain a modulated-symbol sequence; wherein said method is characterised in that said coefficients w(i) are obtained by a calculation step the function of which is to minimise the signal-to-noise ratio between said modulated symbols and the symbols constituting said theoretical constellation. |
