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Mobile communication apparatus

A technology of mobile communication equipment and signals, applied in the direction of electrical components, multi-carrier systems, transmission systems, etc., can solve difficult problems

Inactive Publication Date: 2005-08-24
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With configurations that simultaneously create local oscillator signals corresponding to transmit and receive frequencies, it is difficult to keep the transmit frequency constant while changing the receive frequency

Method used

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  • Mobile communication apparatus
  • Mobile communication apparatus
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Examples

Experimental program
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Embodiment Construction

[0024] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0025] figure 1 is a block diagram showing the configuration of the main part of the mobile communication device associated with the first embodiment of the present invention

[0026] In this embodiment, the configuration of a frequency synthesizer section of a mobile phone used in a mobile station terminal of a mobile communication system is shown as an example of a mobile communication device associated with the present invention. The mobile communication device of this embodiment corresponds to a TDMA (Time Division Multiple Access) type voice telephone conversation, packet communication, etc., and is designed to be capable of transmitting and receiving synchronous operations in the case of packet communication, etc.

[0027] Such as figure 1 As shown, the mobile communication device of this embodiment has: a first VCO 11 corresponding to the first oscillator, fo...

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Abstract

It is an object of the present invention to accomplish a frequency synthesizer portion capable of simultaneous operations for transmission and reception with a simple configuration. A mobile communication device associated with the present invention has a frequency-switchable first VCO ( 11 ) for creating local oscillator signals for transmission and reception, respectively, and a second VCO ( 12 ) for creating a local oscillator signal for transmission in a case of simultaneous operations for transmission and reception. Furthermore, there is provided a switch ( 16 ) for connecting the first VCO ( 11 ) with a transmitter mixer ( 31 ) and a receiver mixer ( 21 ) when transmission or reception is performed and for connecting the second VCO ( 12 ) and first VCO ( 11 ) with the transmitter mixer ( 31 ) and receiver mixer ( 21 ), respectively, when transmission and reception are performed simultaneously. In addition, the oscillation frequency of the second VCO ( 12 ) is set to twice the oscillation frequency of the first VCO ( 11 ) used during transmission. A 1 / 2 frequency divider ( 18 ) and a switch ( 17 ) are provided to frequency-divide the output from the second VCO ( 12 ) by a factor of 2 during operation of the second VCO ( 12 ).

Description

technical field [0001] The present invention relates to a mobile communication device capable of performing transmission and reception synchronous operations, and more particularly to a structure of a frequency synthesizer section for supplying a local oscillator signal to a transmission section and a reception section. Background technique [0002] In a mobile communication system using a mobile phone or the like as a mobile station terminal, in addition to voice telephone conversations, data communication using packet communication is also possible. In recent years, packet communication using wireless technology in which simultaneous transmission and reception can be used has been started to improve the data transmission rate. For example asymmetric packet communication has been proposed. Specifically, when packet communication is performed by TDMA (Time Division Multiple Access) technology, during one subframe as a unit of time division multiplexing execution time, a plu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/38H04B1/3822H04B1/40
CPCH04B1/403
Inventor 冈田真一大河贞夫四官正人望月诚
Owner PANASONIC CORP