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Communication apparatus and frequency control method for communication apparatus

A technology for communication equipment and frequency control, which is applied in the direction of electrical characteristic frequency control, automatic frequency control components, multiplexing communication, etc., and can solve the problems of demodulation characteristics degradation and accuracy degradation of demodulation device 407

Inactive Publication Date: 2004-01-14
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Decrease in accuracy of TCXO due to initial deviation, temperature characteristics and aging characteristics
That is, the demodulation characteristic of the demodulation device 407 is degraded by the reception frequency offset caused by the intrinsic initial deviation, temperature characteristic, and aging characteristic of the TCXO

Method used

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  • Communication apparatus and frequency control method for communication apparatus
  • Communication apparatus and frequency control method for communication apparatus
  • Communication apparatus and frequency control method for communication apparatus

Examples

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no. 1 example

[0029] Fig. 1 is a block diagram of a communication device of a first embodiment of the present invention. In Fig. 1, the communication device according to this embodiment includes: antennas 101 and 111; mixers 102 and 112; local oscillators 103 and 113, voltage controlled oscillator 104; A / D converter 105; converters 106 and 115; demodulation means 107; reception frequency offset estimation means 108; modulation means 117; transmission frequency offset control means 118 and central processing unit (CPU) 121.

[0030] According to the communication device of this embodiment, the reception signal received by the antenna 101 using the local oscillator 103 is converted into an intermediate frequency signal after being passed through the mixer 102, and the generated signal is converted into a digital signal through the A / D converter 105, and passed through The receive frequency offset estimation means 108 determines a frequency offset estimate FOS. By using the CPU 121, the contr...

no. 2 example

[0040] Next, a communication device and a frequency control method of the communication device according to a second embodiment of the present invention will be described.

[0041] The configuration of the communication device according to this embodiment is shown in FIG. 1, and is the same as that of the first embodiment. The communication device according to the second embodiment differs from the first embodiment in that a new channel is assigned just after the handover command, uses a different frequency offset correction control, and the second embodiment Applicable only to a communication device for a mobile station such as a mobile phone for performing TDMA (Time Division Multiple Access) communication.

[0042] image 3 is a concept explanatory diagram of frequency offset correction in the communication device according to this embodiment. exist image 3 In , the two-dot dash line represents the time trajectory of the received reference frequency fRS. The single dot...

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Abstract

A communications apparatus and a frequency control method thereof, in that control of a reference frequency (local oscillator frequency) is made by feeding back a frequency offset estimate FOS to the voltage-controlled oscillator 103, and the frequency offset between sending and receiving frequencies is corrected by feeding back a frequency offset control value FOC which is based on a sending reference frequency command on downstream control data DCD to sending frequency offset control means 118, to control a sending reference frequency by using both a voltage-controlled oscillator 108 (a frequency control step) and sending frequency offset control means 118 (a sending frequency offset control step).

Description

technical field [0001] The present invention relates to a communication device for mobile communication (such as a mobile phone) and a frequency control method for the communication device, and particularly to such a communication device and a frequency control method for the communication device such that even with a voltage-controlled oscillator or Non-linearity, temperature characteristics, and aging characteristics of the reference oscillator cause a drop in accuracy, and high-precision frequency offset correction is also possible without a drop in accuracy and demodulation characteristics of the transmission or transmission / reception reference frequency. Background technique [0002] Figure 4 is a block diagram of a related communication device provided with a frequency offset correction characteristic (hereinafter referred to as a first related art). [0003] exist Figure 4 Among them, the communication device according to the first related art includes: antennas 401...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/50H03J7/04H04B1/04H04B1/26H04B1/3822H04B7/01
CPCH04B1/40H03J7/04
Inventor 山本直行宫下新一郎
Owner PANASONIC CORP