Automatic frequency control method of double-mode terminal and double-mode terminal

A technology of automatic frequency control and dual-mode terminals, applied in the field of communication, can solve problems such as waste of resources and achieve the effect of improving work performance

Active Publication Date: 2011-01-26
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

That is to say, for dual-mode terminals, only two sets of AFC systems will be used in the dual-sta

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  • Automatic frequency control method of double-mode terminal and double-mode terminal
  • Automatic frequency control method of double-mode terminal and double-mode terminal
  • Automatic frequency control method of double-mode terminal and double-mode terminal

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Embodiment Construction

[0023] In the following description, many technical details are proposed in order to enable readers to better understand the application. However, those skilled in the art can understand that without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in each claim of the present application can be realized.

[0024] In order to make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the implementation of the present invention in detail in conjunction with the accompanying drawings.

[0025] The first embodiment of the present invention relates to an automatic frequency control method for a dual-mode terminal. In this embodiment, the dual-mode terminal includes a set of AFC system, and the supported first network system and second network system are GSM system and TD system respectively. A Cordic (coordinate rotation digital c...

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Abstract

The invention relates to the communication field, specifically disclosing an automatic frequency control method of a double-mode terminal and the double-mode terminal. The method utilizes a set of AFC regulating system to decide which network system to control the regulation of the AFC according to working states of two network systems supported by the double-mode terminal when the double-mode terminal is in a double-standby state. If the first network system (such as a GSM system) controls the regulation of the AFC, the double-mode terminal performs frequency deviation correction to receiveddata signals before demodulating the received data signal when the double-mode terminal transceives the data signal from the second network system (such as a TD-SCDMA system); and the double-mode terminal performs frequency deviation correction to data signals to be transmitted before transmitting the data signals to be transmitted. Because one AFC system finishes the frequency synchronization and compensation of the whole system, the cost is reduced and the working ability of a double-mode double-standby system is improved.

Description

technical field [0001] The invention relates to the communication field, in particular to an automatic frequency control technology in the communication field. Background technique [0002] In a mobile communication system, it is necessary to ensure frequency synchronization between the sending end and the receiving end. Since the frequency deviation of the transceiver and the movement of the terminal may cause the frequency deviation of the transceiver, automatic frequency control (Automatic Frequency Control, "AFC") has become an important component of the coherent communication system. For related technologies of AFC-based wireless devices, reference may be made to US Patent No. "5634205". [0003] In the existing TD-SCDMA / GSM dual-mode terminal, a commonly used method is that there is only one AFC system in the dual-mode terminal, which is provided to Time Division Synchronous Code Division Multiple Access (TSCDMA) after frequency conversion. "TD-SCDMA" for short) and ...

Claims

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Application Information

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IPC IPC(8): H04W56/00H04W88/06H04B7/26
Inventor 刘文明刘利平董霄剑沈旭强
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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