Hello , I despair on how to regain the initial information from the seperate I and Q bits after MSK modulation/demodulation. If d(t) is the data, a sum of delta pulses g(t) is the frequency response (MSK: REC) and c(t)=g(t)*d(t) (* convolution !) then phi(t) is the phase , which is calculated by cumsum(c(t)) (MSK:"linear ramps up and down according to the bit") and thus exp(j *phi(t)) represents the equivalent complex baseband signal s(t). This works very well. A plot of Real(s(t)) and Imag(s(t)) gives the typical sin and cosine forms of the I and Q channel. My question: After Demodulation , e.g. with matched filtering, I get two bit streams I and Q but how do I demultiplex them to recuperate the d(i) ? Thanks a lot Florian Toulouse Berlin / Germany

# Mapping MSK ? How to regain the information from I and Q ?

Started by ●March 13, 2006