M-ary continuous phase frequency shift keying with modulation index 1/M
Abstract
Two techniques for detecting M-ary CPFSK signals with modulation index equal to 1/M are presented. The first method does not require a coherent carrier and is identical to the differential detection of DPSK. The second method requires a coherent carrier and is identical to the coherent detection and differential decoding of differentially encoded PSK. In this case, the error rate is equal to the error rate in coherent-detection/differential-decoding of PSK. Autocorrelation functions and power spectral density functions are derived for M-ary CPFSK. It is demonstrated that M-ary CPFSK have similar autocorrelation functions and similar power spectral density functions regardless of the number levels, when M is greater than or equal to four. Finally, the fractional out-of-band power is compared between M-ary CPFSK and PSK.
- Publication:
-
IEE Proceedings F: Communications Radar and Signal Processing
- Pub Date:
- April 1984
- Bibcode:
- 1984IPCRS.131..173E
- Keywords:
-
- Fm/Pm (Modulation);
- Frequency Shift Keying;
- Phase Shift Keying;
- Signal Detection;
- Autocorrelation;
- Bit Error Rate;
- Fourier Transformation;
- Power Spectra;
- Communications and Radar