Title :
Soft-decision algorithm and readable erasure correction for a BFSK demodulator
Author_Institution :
Dept. of Electr. Eng., New Brunswick Univ., Fredericton, NB, Canada
Abstract :
A soft decision algorithm is described for a tangent lock loop based BFSK (binary frequency shift keying) modem. The performance of DSP (digital signal processing)-based modems can be improved by making use of the "quality" of individual bits in a demodulated bitstream, where a confidence level can be assigned to bits by recording the parameter(s) used by a soft decision algorithm. Sample test results for demodulation and erasure correction using the CHU time signal are presented
Keywords :
demodulators; digital phase locked loops; error correction; frequency shift keying; modems; BFSK demodulator; CHU time signal; binary frequency shift keying; confidence level; digital signal processing; modems; performance; readable erasure correction; soft decision algorithm; Baseband; Demodulation; Error correction; Frequency shift keying; Maximum likelihood decoding; Maximum likelihood detection; Modems; Q factor; Signal processing; Testing;
Conference_Titel :
Communications, Computers and Signal Processing, 1993., IEEE Pacific Rim Conference on
Conference_Location :
Victoria, BC
Print_ISBN :
0-7803-0971-5
DOI :
10.1109/PACRIM.1993.407332
