RADIO EQUIPMENT, BASE RADIO STATION EQUIPPED THEREWITH, PORTABLE INFORMATION TERMINAL AND RADIO COMMUNICATION SYSTEM INCORPOLATING THEM

PROBLEM TO BE SOLVED: To realize dual-mode radio equipment, portable information terminal, base radio station, and radio communication system in simpler constitutions under a communication system the working frequency band of which is widened by providing a TDD mode frequency band additionally to an...

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Bibliographic Details
Main Authors AKAOKA YASUNOBU, WATANABE HIDEKI, TAKADA JUNICHI, KOJIMA NORIHARU
Format Patent
LanguageEnglish
Published 14.06.2002
Edition7
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
MULTIPLEX COMMUNICATION
TRANSMISSION
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Summary:PROBLEM TO BE SOLVED: To realize dual-mode radio equipment, portable information terminal, base radio station, and radio communication system in simpler constitutions under a communication system the working frequency band of which is widened by providing a TDD mode frequency band additionally to an FDD mode fre quency band. SOLUTION: The radio equipment is constituted to selectively use first and second power amplifiers 105 and 106 and first and second low-noise amplifiers 113 and 114, which are made to adapt to narrower frequency bands and have different working frequency bands by means of high-frequency switches SW4, SW5, SW7, and SW8 for selecting frequency bands, by dividing the power amplifiers of a transmitting system and low-noise amplifiers of a receiving system in the frequency band used by the radio equipment. A transmitting circuit 131 and a receiving circuit 133 are commonly used in both an FDD mode and a TDD mode by switching high-frequency switches SW1-SW3 and SW6.
Bibliography:Application Number: JP20000365465