identity modulation : add new modulation formats.

[ggalimba56]

The identity modulation is covering almost all modulation formats.
My proposal is to complete the list adding:

• DPSK (Differential Phase Shift Keying)
• QAM32
• DP-QAM32
• QAM64
• DP-QAM64
• HYBRID modulation format (see also Hybrid Modulation format #47)
• probabilistic shaping modulation format

Further description will be provided to the above list.

[egriseri]

@ggalimba56 for sure we can't fully cover all the modulation formats. I also noticed that we included dual carrier format, and this opens to additional complexity (let's imagine a 4 carrier format, and so on)
Anyway, for the probabilistic shaping we can specify the "base" format as 8QAM, 16QAM, 32QAM, 64QAM but I really doubt we should specify the entropy value. What do you think?

[sergiobelotti]

Call on 05/24/22:
The proposal from Gabriel is to add the first 4 modulation formats listed above and leave a part the last two for the moment.
AP @ggalimba56 Gabriele: to introduce description on the 4 modulation format above and a standard reference (if exists)

[ggalimba56]

Here a possible proposal:

identity DPSK {
base modulation;
description
“DPSK (Differential Phase Shift Keying) modulation";
}

identity QAM32 {
base modulation;
description
"QAM32 (32 symbols Quadrature Amplitude Modulation)";
}

identity DP-QAM32 {
base modulation;
description
"DP-QAM32 (32 symbols Dual Polarization Quadrature Amplitude
Modulation)";
}

identity QAM64 {
base modulation;
description
"QAM64 (64 symbols Quadrature Amplitude Modulation)";
}

identity DP-QAM64 {
base modulation;
description
"DP-QAM64 (64 symbols Dual Polarization Quadrature Amplitude
Modulation)";
}

[sergiobelotti]

@ggalimba56 @egriseri : do you know if a standard reference exists to be added in the description?