Title :
Orthogonal phase functions for full response noncoherent CPM systems
Author :
Pandey, R. ; Leib, H. ; Pasupathy, S.
Author_Institution :
Dept. of Electr. Eng., Toronto Univ., Ont., Canada
Abstract :
Continuous phase modulation (CPM) with noncoherent detection over a one-symbol interval is discussed. 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 purchase function to achieve noncoherent orthogonal performance for various values of the modulation index (h) is presented. Using the Gram-Schmidt orthogonality procedure, an entire family of orthogonal phase functions for h>or=0.68 is derived. All CPM schemes with these phase functions produce the same performance as noncoherent orthogonal signaling. For h=1 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.<>
Keywords :
phase modulation; FSK; Gram-Schmidt orthogonality procedure; SNR performance; continuous phase modulation; demodulation strategy; full response CPM systems; noncoherent detection; noncoherent orthogonal performance; orthogonal phase functions; Continuous phase modulation; Demodulation; Detectors; Digital modulation; Error probability; Frequency shift keying; Phase detection; Phase modulation; Signal detection;
Conference_Titel :
Communications, Computers and Signal Processing, 1989. Conference Proceeding., IEEE Pacific Rim Conference on
Conference_Location :
Victoria, BC, Canada
DOI :
10.1109/PACRIM.1989.48367