BPSK DEMODULATOR

PROBLEM TO BE SOLVED: To provide a small-sized information terminal by simplifying hardware for applying BPSK processing to a reader/writer for a contactless IC card and a radio tag. SOLUTION: A preamplifier amplifies a received signal that is received from an antenna and BPSK-modulated, the amplifi...

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Bibliographic Details
Main Authors HATADA NAOKI, SUZUKI SHIRO, KOBAYASHI OSAMU, WATANABE KOSUKE
Format Patent
LanguageEnglish
Published 30.11.2000
Edition7
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Summary:PROBLEM TO BE SOLVED: To provide a small-sized information terminal by simplifying hardware for applying BPSK processing to a reader/writer for a contactless IC card and a radio tag. SOLUTION: A preamplifier amplifies a received signal that is received from an antenna and BPSK-modulated, the amplified signal passes through a filter that eliminates the carrier from the signal to extract only a required signal, a comparator measures a time from the rise of a threshold processed waveform until a succeeding rise to detect the wavelength and a parts of a change in the wavelength are detected as phase change points shown in Figure 5 to conduct BPSK demodulation. Thus, a BPSK demodulation circuit having been executed by hardware conventionally is eliminated and software covers the BPSK demodulation circuit, then a small-sized information terminal requiring BPSK demodulation can be provided.
Bibliography:Application Number: JP19990142842