Data communication system and radio IC card system

Details Data communication system and radio IC card system Data communication system and radio IC card system

1997-09-12

1999-09-07

Chin, Wellington

Pulse or digital communications

Pulse transmission via radiated baseband

375340, 329345, 329346, H04L 2700

Patent

active

059498234

ABSTRACT:
An arrangement to realize the functions of a radio card system in which power is transmitted to perform data communication. According to such arrangement, a delay line and a clock regenerating circuit such as PLL circuit which are previously necessary for demodulation by PSK are not necessary, and thus functions of data communication are realized by minimum hardware construction, size, cost and power consumption. Further, in a data communication system in which electric power transmission using a signal of a frequency fp and digital data communication using a carrier wave of a frequency fs are performed by radio, fs and fp are in the relationship of fs=fp/N (where N is an integer) and a phase shift P when the phase of the carrier wave is modulated by PSK is (M.times.360.degree.)/N (where M, N are integers and P is preferably not equal to 180.degree.).

REFERENCES:
patent: 5418353 (1995-05-01), Katayama et al.
patent: 5455408 (1995-10-01), Urata et al.
patent: 5671254 (1997-09-01), Nagata et al.
patent: 5698838 (1997-12-01), Yamaguchi

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