Digital Signal Processing - IP and Algorithms

[falconbombay]

Hi,

I want to implement Gmsk modulator using FM modulator. I have attached the block diagram of Gmsk modulator using FM modulator. In that i have implemented the Gaussian FIlter and the FM modulator using DDS.But I am unable to implement   the portion in block diagram marked as red. In that the output of the Gaussian filter is multiplied by constant 2*pi*h, where  "h" is the modulation index and for Gmsk it is 0.5. Please help me regarding this.

[vlavruhin]

Hi,

What difficulties do you experience with implementation of this block?

As you stated it's just multiplication by constant value 2*pi*h | h=0.5 = pi.

It can be implemented as additional multiplier after Gaussian filter.

Or you can scale the coefficients of Gaussian filter.