Method and apparatus for demodulating digital data transmitted by frequency hopping on an ionospheric transmission channel

摘要

The method consists: in estimating the number of paths by their average delays in the spread band of the frequency-hopping signals - in performing a first filtering (12) of the samples of the porch received matched to the modulation and to the channel - performing a second filtering consisting : - in cancelling out (13) the interference due to the symbols already demodulated, - in cancelling out (14) the interference due to the symbols not yet demodulated and in determining (15) from the result of the second filtering the most probable symbol transmitted. Application: demodulator of frequency-hopping signals. IMAGE