Chumak O. Quality coefficient increase of the coherent processing device of multi-position signals in multi-channel modems

The accomplishing technical-scientific tasks and logical design of optimum multi-position signal reception by multi-channel modems is the object of researches, and the subject of researches is the increasing quality index of information transmission in digital form using different types of communication channels. It is specified that usage of multi-channel modems with orthogonal signals provides invariance to casual excitation. There are analyzed; multi-position signal systems, on the basis of which data transfer speed close to channel capacity can be reached. The situations that can create circumstances responding to optimum non-coherent and auto-coherent methods of multi-positional signal reception procession are analyzed and noise-immunity of demodulators that realize these reception methods is determined. The universal algorithm of optimum coherent reception of multi-positional amplitude-phase modulation and amplitude-phase differential modulation signals by multi-channel modems with orthogonal signals is offered, and specific algorithms of coherent procession of effective systems of multi-positional signals are developed. The algorithm of optimum multi-positional signals reception on the noise background with the help of rank method in the conditions of non-parametric prior uncertainty is developed. The received results allow conducting with the greater probability digital transmission of the information with the usage of multi-channel modems that effectively increase communication channels quality coefficient in heterogeneous telecommunication networks. The area of implementations is the telecommunication systems.