Method and apparatus for the demodulation of digit

专利名称：Method and apparatus for the

demodulation of digital signals which aremodulated in a continuous manner in phaseand/or frequency with the help of a constantamplitude envelope carrier

发明人：TANGUY, YANNICK,ROBINEAU, JOSE申请号：EP401611.2申请日：190609公开号：EP0353109B1公开日：19931020

摘要：The invention relates to the demodulation of digital signals composed ofsequences of symbols of duration T transmitted by means of phase and/or frequencyjumps. The method consists in sampling (1) the phase of the detected modulated signalwithin each symbol duration T, by means of a sampling pulse comb obtained from Ntiming pulses regularly spaced by a time interval equal to T/N; in calculating (1) thedifferential phase angle d phi between symbols, for each phase sample of the detectedcurrent symbol; in coding (4) each differential phase angle d phi by attributing thereto acoding cost; in calculating (4) the sums of the coding costs for the samples of equalsymbol rank belonging to a specified number L of consecutive symbols; in identifying (4),from among the N sums obtained, the one which gives the largest result; in taking (4) assymbol-synchronisation timing signals, the timing signal which, in the pulse comb,possesses the same rank as the rank of the samples which resulted in the largest sum,and in decoding (5) the differential phase angle which possesses the same rank as the

stored sample. …Application: digital radio signal transmissions. ……

申请人：THOMSON-CSF,THOMSON CSF,THOMSON-CSF

地址：51, ESPLANADE DU GENERAL DE GAULLE; F-92800 PUTEAUX,FR,51, ESPLANADEDU GENERAL DE GAULLE; F-92800 PUTEAUX

国籍：FR

代理机构：Lincot, Georges

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