Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1987-09-22
1989-01-17
Pellinen, A. D.
Pulse or digital communications
Spread spectrum
Direct sequence
375118, H04L 706
Patent
active
047992417
ABSTRACT:
The symbol synchronization method for the symbol demodulation of a digital signal uses E sequences of samples taken from the demodulated signal, each sequence being offset with respect to the following one by a fraction of the symbol period Ts/E. On the basis of each one of E sequences of samples (Si1,Si2, . . . SiN) ranging from from i=0 to E-1, a value F(i) of a pre-defined function F, optimized according to the type of modulation made at emission, is calculated. This function, which can be identified with a sine model, A+B COS(i-io)2.pi./E, can be used to determine io characteristic of the synchronization time-shift and, if necessary, A, characteristic of the d.c. offset, and B, characteristic of the variation in levels due to reception conditions. These values are used to correct the synchronization signal and, if necessary, the d.c. and the decision thresholds of the decision circuit during the symbol demodulation.
REFERENCES:
patent: 4306308 (1981-10-01), Nossen
patent: 4577334 (1986-03-01), Boer et al.
Patent Abstracts of Japan, vol. 9, No. 110 (E-314) [1833], May 15, 1985; & JP-A-60 135 (Toshiba K.K.) 05-01-1985.
"Thomson-CSF"
Jennings Derek S.
Pellinen A. D.
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