04-20-2012 11:18 PM
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.
04-22-2012 10:46 PM
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.