Digital phase lock loop for wireless communication and apparatus using same
AssigneeCanon Kabushiki Kaisha
InventorHideya Tabeta
Life of this patent
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Abstract
A wireless communication apparatus includes an ISDN interface, an RF unit, and a digital phase-lock loop. When synchronization with the digital line has been established, the digital phase-lock loop counts a clock from the RF unit on the basis of the clock of the ISDN, extracted by the ISDN interface and the output of the digital phase-lock loop, and outputs a clock, so that wireless communication is performed in synchronization with the output of the digital phase-lock loop. When synchronization with the digital line has not been established, the digital phase-lock loop frequency-divides the clock from the RF unit in order to generate a synchronization clock for wireless communication.
Claims4
A wireless communication apparatus comprising:
- first clock generation means for generating a first clock synchronized with a digital line;
- high-frequency processing means, having second clock generation means for generating a second clock, for processing a high-frequency signal;
- third clock generation means for generating a third clock for wireless communication on the basis of the first and second clocks;
- and
- wireless transmission frame processing means for performing a process for assembling and disassembling wireless transmission frames on the basis of the second and third clocks.
Dependencies are inferred from the claim text.