QPSK Modulator and Demodulator

[Fauza Khair]

Dear All,

Please your advice and recommendation about QPSK Modulation and Demodulation. Now, I use the OptiSys 12, but I can’t find QPSK Modulator and Demodulator.

Please Sharing about that.

What different between OQPSK and QPSK modulator ?

Thank All

Regard,

Fauza

[Damian Marek]

Hi,

There are many ways to implement the QPSK modulator, which depend on the level of detail you want. If you want a black box type component use the Optical QPSK Transmitter, which can be found in the “Default/Transmitters Library/Optical Transmitters” folder.

Also be sure to check out the examples we have in the “OptiSystem 12 Samples/Advanced modulation systems/PSK systems” folder.

Offset QPSK is a modulation scheme very similar to regular QPSK, where the in-phase and quadrature signals are not changed at the same time, so that the total signal never has sharp changes in phase. Wikipedia has a great article on the differences:

http://en.wikipedia.org/wiki/Phase-shift_keying

Regards

+2

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