Hi experts, I started playing with a system level simulator called CppSim by following thru their tutorial on a GMSK transceiver. Here's the link to the tutorial. http://www.cppsim.com/Tutorials/gmsk_tutorial.pdf Since this is a free software there's really no support from them. I am only in the first section of this tutorial, and i noticed something on their setup that I would like to get the experts opinion on this. On Page 5 of the tutorial it shows the setup depicting a GMSK transmitter transmit a single channel to a GMSK receiver. I assumed the gain = 1/5 between the two block represents a 3dB loss over the air. On page 8 and 9 it shows the wave form of the I and Q components of the transmitter, and the I and Q components come out of the receiver. Here are my questions: 1) How is it is that they only use the I component of the transmitter to transmit to the receiver? Why is the Q component ignored? 2) At the receiver output, the Q component appear to be the inverting equivalent of the transmit Q component. But, how does the receiver know how the Q waveform is if only the I component is transmitted?