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Calibration method of time division-synchronization code division multiple access (TD-SCDMA) terminal

A technology of TD-SCDMA and calibration method, which is applied in the field of fast AFC, APC calibration, and AGC. It can solve the problems of difficult control of individual differences in mobile phones, low precision, and impact on calibration speed, etc., so as to reduce the number of loop iterations, improve calibration speed and Accuracy, the effect of improving the speed of calibration

Inactive Publication Date: 2011-06-08
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the number of points is too small, the accuracy is not high, and it may not be able to meet the requirements of the 3GPP agreement. It is difficult to control the individual differences of mobile phones in mass production.
If there are too many points, although the calibration accuracy is improved, the calibration speed is greatly affected

Method used

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  • Calibration method of time division-synchronization code division multiple access (TD-SCDMA) terminal
  • Calibration method of time division-synchronization code division multiple access (TD-SCDMA) terminal
  • Calibration method of time division-synchronization code division multiple access (TD-SCDMA) terminal

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] figure 1 It shows the flow of a preferred embodiment of the TD-SCDMA terminal calibration method of the present invention. See figure 1 , the calibration of the TD-SCDMA terminal includes AFC calibration (step S10), AGC calibration (step S20) and APC calibration (step S30), these three aspects of calibration do not exist in the order of execution.

[0031] The calibration of these three aspects is described below.

[0032] For AFC calibration, the formula based on the calibration is: y=kx+b, where x is the AFC control word, y is the frequency value generated by the frequency control word, and k is the frequency step caused by the frequency control word step Into, b is the initial value when the frequency value is 0. By changing x twice and getting y twice, k and b can be calculated to complete AFC calibration.

[0033] The steps of AFC calib...

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Abstract

The invention discloses a calibration method of a time division-synchronization code division multiple access (TD-SCDMA) terminal, which increases terminal calibration speed and enhances terminal calibration accuracy. The technical scheme comprises three aspects, namely automatic frequency control calibration, automatic gain control calibration and automatic power control calibration, wherein the automatic frequency control calibration comprises the following steps of: under the fixed input signal power of a signal source, changing a control word; demodulating to acquire data of a plurality of frames; calculating frequency information; and performing linear variation to acquire a step change value and an automatic frequency control initial value; the automatic gain control calibration comprise the following steps of: under the fixed input signal power of the signal source, changing the control word to acquire a plurality of groups of receiving signal intensity values, a gain value of a fixed gain module and a gain slope of a variable gain module; calculating input signal power and a gain value and combining automatic gain calibration tables; and the automatic power control calibration comprises the following steps of: transmitting a power list by gradually increasing or decreasing control words at a fixed periodic interval by using the terminal; acquiring data by using a frequency spectrograph; and selecting a power value and a control word.

Description

technical field [0001] The present invention relates to a calibration method for terminal mobile phones, in particular to a fast AFC (Automatic Frequency Control), AGC (Automatic Gain Control), and APC (Automatic Power Control) applied to TD-SCDMA (Time Division Synchronous Code Division Multiple Access) Calibration method. Background technique [0002] At present, the AFC calibration of mobile phones mostly adopts Tx technology, that is, the UE transmits a modulated signal to the spectrum analyzer or comprehensive tester, the instrument demodulates the frequency information, the mobile terminal (UE) changes the AFC control word, and the cycle is repeated. The obtained frequency information is used to calculate the frequency step and the initial value of the frequency to complete the calibration. [0003] At present, each manufacturer has its own design for the AGC calibration of mobile phones and the measurement of received signal strength (RSSI). Under the signal, the si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00H04W88/02H04M1/24
Inventor 孙忠平高泽庆陶锋施武林
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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