Title :
A 4-level, bandwidth-efficient CPM scheme
Author :
Kritzinger, S.E. ; Schoonees, J.A. ; Braun, R.M.
Author_Institution :
Dept. of Electr. Eng., Cape Town Univ., Rondebosch, South Africa
Abstract :
A multi-level CPM system can be broken down into a linear continuous-phase encoder and a memoryless modulator, which reduces the system to an easily analyzable form. In this paper, the work presented by Rimoldi is used to develop an encoder for 4-level CPFSK with modulation index 1/4 in order to satisfy the data throughput requirements of LEO satellite links. The waveforms produced by the modulator are illustrated and the power spectral density for the scheme is derived. A simplified demodulator is less expensive than a Viterbi decoder, and is therefore suitable for low cost applications
Keywords :
continuous phase modulation; encoding; modulators; satellite communication; spectral analysis; 4-level CPFSK; LEO satellite links; bandwidth efficiency; data throughput; demodulation; linear continuous-phase encoder; low cost applications; memoryless modulator; modulation index; multi-level CPM system; power spectral density; Decoding; Equations; Frequency response; Mathematical model; Modulation coding;
Conference_Titel :
Communications and Signal Processing, 1993., Proceedings of the 1993 IEEE South African Symposium on
Conference_Location :
Jan Smuts Airport
Print_ISBN :
0-7803-1292-9
DOI :
10.1109/COMSIG.1993.365859
