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Control method of dual-standby terminal and AFC (automatic frequency control) loop of dual-standby terminal

A technology of automatic frequency control and control method, which is applied in the field of communication, can solve the problems of optimal automatic frequency correction performance, being in a call or standby state, waste of terminal implementation costs, etc., and achieves reduction of implementation costs, simple design, and easy implementation Effect

Active Publication Date: 2011-05-04
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, using two crystal oscillators to control the two AFC loops respectively, and then control the frequency adjustment of the two numbers, causes unnecessary waste of the implementation cost of the terminal
[0011] 2. The working conditions of the two numbers of dual standby may be different, one may be in a call state and the other is in a standby state, or both are in a call or standby state
Therefore, according to the existing implementation method of using an independent AFC to control each standby number, the performance of automatic frequency correction cannot be optimized.

Method used

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  • Control method of dual-standby terminal and AFC (automatic frequency control) loop of dual-standby terminal
  • Control method of dual-standby terminal and AFC (automatic frequency control) loop of dual-standby terminal
  • Control method of dual-standby terminal and AFC (automatic frequency control) loop of dual-standby terminal

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Embodiment Construction

[0032] 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.

[0033] 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.

[0034] The first embodiment of the present invention relates to a dual-standby terminal, such as Figure 5 shown. The dual standby terminal includes two radio frequency modules (namely Figure 5 RF Transceiver 1, RF Transceiver 2), two automatic frequency control AFC loops (i.e. Figure 5 The loop composed of mixer, ADC, frequency offset estima...

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Abstract

The invention relates to the field of communication, and discloses a control method of a dual-standby terminal and AFC (automatic frequency control) loops of the dual-standby terminal. In the invention, two AFC loops share a crystal oscillator, frequency deviation estimation obtained by two AFC loops respectively is processed through a selection control module, a final AFC control word for controlling the shared crystal oscillator is obtained, and the dual-standby terminal for controlling two AFC loops by a single crystal oscillator is realized. Because in the practical use, a corresponding link circuit by two numbers used by the dual-standby terminal, an endured temperature, a channel environment and the movement speed of the terminal are nearly identical, Through sharing one crystal oscillator, not only can be the implementation cost of the dual-standby terminal reduced effectively, but also the automatic frequency correction performance of the AFC loop is hardly not influenced.

Description

technical field [0001] The invention relates to the communication field, in particular to a dual-standby terminal in the communication field. Background technique [0002] Driven by technology, market and wireless mobile application business, the wireless mobile communication industry has developed rapidly, and mobile communication products have become a necessity for people's daily work and life. With the increasing influence of mobile communication on people's life, it is more and more that one person needs two terminals. For example, some people who need to work frequently in two places usually have a local Subscriber Identity Module (Subscriber Identity Module, "SIM") card in each of the two places in order to avoid expensive roaming charges, and use different SIM cards in different cities. SIM card. However, frequent replacement of SIM cards or carrying two terminals is very troublesome, and a dual-card dual-standby terminal with two numbers in one device came into be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/40H03L1/02H04W88/06H04B1/403
Inventor 张严师延山康一顾祥新许佰魁
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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