Abstract:

According to the problem of whether the information transmission capacity of communications following the Shannon formula limit, the information transmission capacity of signals is studied. The symbol is defined as the key contacting signals and information, and the symboltransmission rate of signals is defined as the importance index describing the information transmission capacity of signals, and maximal symboltransmission rate of signals of electronic communication systems is worked out. The results are the information transmission capacity of communications essentially lies on information carrier and information transmission mode,and on nowadays communication modes the information carries only by use of the space degree of freedom of signals and the information transmits only by use of the undulatory property of signals. The Shannon formula shows the information transmission capacity of signals. And finally, the information transmission capacity of high speed signals, microcosmic signals and mesoscopic signals are likely to break through the Shannon formula limit.

Key words: information transmission, ultra narrow band, undulatory property, corpuscular property.