Abstract:

Very minimum chirp keying (VMCK) is a novel highefficiency modulation technology with ultranarrow band. The transmitted signals use a sinelike linear frequency modulation scheme, in which the chirp up or chirp down represents different signals. The generated waveform has continuous phase and a concentrated power spectrum. In order to get an orthogonal signal set of VMCK, we derive a mathematical correlation integral expression and find the solution to give an analytic formula with the Fresnel function. A detailed analysis on some special situations is given. 

Key words:  minimum chirp keying (VMCK); chirp; orthogonality