FULL RESPONSE NON-COHERENT CPM SYSTEMS
Rashmi Pandey, H. Leib, S. Pasupathy · 1989
This paper considers Continuous Phase Modulation (CPM) with non-coherent detection over one-symbol interval. In order to obtain good performance with this simple demodulation strategy, the phase function of the modulation scheme has to be designed properly. An approach to shaping the phase function to achieve non-coherent orthogonal performance for various values of modulation index (h) is presented. Using the Gram-Schmidt orthogonality procedure, an entire family of orthogonal phase functions for hr0.68 is derived. All'CPM schemes with these phase functions produce the same performance as non-coherent orthogonal signaling. For h=l the phase function reduces to that of the FSK phase function. It is shown that there are CPM schemes that give the same SNR performance as noncoherent orthogonal FSK but have some spectral advantages over the FSK modulation format.