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Automatic gain control calibration method and device for communication terminal

A technology of automatic gain control and communication terminal, applied in the field of communication, can solve the problems of saturated reading and inaccurate calibration results, and achieve the effect of fast speed and increase the accuracy of calibration

Active Publication Date: 2018-01-26
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The problem to be solved by the present invention is that the existing AGC calibration method may cause the RSSI reading value of the communication terminal to exceed the digital register range of the ADC and saturate the reading, resulting in inaccurate calibration results

Method used

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  • Automatic gain control calibration method and device for communication terminal

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Embodiment Construction

[0028] Downlink AGC calibration, that is, to calibrate the downlink radio frequency link gain of the communication terminal, so that it can automatically control the receiving gain. The output signal power (Cell power) used in the AGC calibration process and the AGC gain control word (AGC gain index) in the communication terminal adapt to each other, so that the reading value of the ADC in the baseband of the communication terminal is within the range with the best linearity.

[0029] Since the digital register of the ADC in the baseband of the communication terminal can cover a fixed power range, such as 50dB, and the AGC channel gain (AGC gain) needs to cover a power range of about 90dB, in order to improve the calibration efficiency, the existing technology Usually two fixed Cell powers are used to cover the entire range of AGC gain.

[0030] However, because the existing AGC calibration uses a fixed Cell power value, the coverage of the ADC reading is fixed, and the tolera...

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Abstract

An automatic gain control calibration method and device for a communication terminal, the automatic gain control calibration method for the communication terminal includes: configuring individual corresponding output signal powers for all gain control words within the power range involved in the gain of the entire AGC channel; Under each configured output signal power, the corresponding gain control word is calibrated. The technical scheme of the invention can increase the tolerance range of AGC calibration to the fluctuation of the hardware parameters of the communication terminal, and increase the accuracy of calibration.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to an automatic gain control calibration method and calibration device for a communication terminal. Background technique [0002] The absolute accuracy of components used in communication terminals, such as mobile phones, is often insufficient to meet the performance goals of the device's frequency, power level, and other parameters. After the production line is assembled, the electrical performance of each communication terminal is different due to the errors in the components and process itself, which may have a greater impact on its communication quality. Calibration can reduce the requirements for components of wireless transmitting and receiving equipment, reduce material costs, and ultimately reduce the cost of the entire wireless transmitting and receiving equipment to achieve the best communication quality. Calibration is to control the communication terminal to ente...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/13H04B17/21
Inventor 赵毅许殿刘鸿亮
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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