Comparison of Demodulation Techniques for MSK

For MSK, three demodulators are compared. The rst demodulation algorithm, partially coherent demodulation, is based on a classical matched lter approach combined with feedforward phase synchronization, whereas the second algorithm, block demodulation, is based on minimizing a distance measure based on the symbol vector trial and the observed di erential phase vector. The third algorithm is based on the same distance measure, however the minimization is carried out using the viterbi algorithm. We provide a derivation of the second algorithm. It is shown that the rst approach is superior both in performance and computational complexity. The rst algorithm also exhibits the best robustness properties in the case of signal impairments.