TIME DIFFUSION DEMODULATION SYSTEM

摘要

PURPOSE:To restore an original digital information signal from the time diffusion modulation signal of a phasing transmission line where an envelope level fluctuates by executing weighing in accordance with a reception envelope level and obtaining the candidate of a most probable transmission digital information system from the time diffusion modulation signal accompanied by envelope fluctuation. CONSTITUTION:Respective orthogonal code system conversion parts 2 and a synthesis part 3 are provided for a time diffusion modulation part 7 and distance detection parts 5 and a minimum value judgement part 6 for a time diffusion demodulation part 8. A most liklihood method which is to obtain a distance between a reception signal system and respective time diffusion systems in the process of inverse diffusion at the time of demodulation time diffusion and to judge the time diffusion signal system with the smallest distance to be the system having high possibility to have been transmitted is taken in. At the time of obtaining the distance between respective reception points and time diffusion signal points, a coefficient proportional to the envelope level is multiplied by respective distances so as to execute calculation. Thus, inverse diffusion can effectively be executed when an envelope fluctuates.