Performance of Multilevel Narrow-Band FM Digital Communication Systems

The performance of multilevel narrow-band FM using conventional modulators and demodulators is evaluated. The parameters of the system are optimized, and it is shown that it is possible to achieve the same probability of error as with ideal n-ary phase modulation and comparison detection with only fractions of a dB of more average signal power at the detector. The system appears attractive in that it might be very simply instrumented.