Calibration method, calibration device and calibration system of frequency synthesizer in communication terminal
A frequency synthesizer and communication terminal technology, applied in the field of communication, can solve problems such as difficulty in adapting to frequency synthesizer frequency calibration and increasing frequency calibration costs, and achieve the effects of saving signaling overhead, improving calibration efficiency, and improving accuracy
Active Publication Date: 2017-12-26
SPREADTRUM COMM (SHANGHAI) CO LTD
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[0006] However, with the continuous development of communication technology and the gradual evolution of mobile communication technology along 2G, 3G, and 4G, the communication terminal adopting the new generation of mobile communication technology due to the change of its communication mode, all original research and development and calibration production lines It will be difficult to adapt to the frequency calibration of the frequency synthesizer in the communication terminal under the new communication mode
For example, if the equipment originally used for frequency calibration of the frequency synthesizer in the TD-SCDMA or WCDMA communication terminal is to be used for the calibration of the frequency synthesizer in the LTE communication terminal, it needs to be developed and calibrated Re-upgrade the production line or purchase equipment and software with LTE digital modem modules, which will inevitably increase the cost of frequency calibration
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[0034]As described in the background technology, the disadvantage of the prior art is: for the equipment that supports the frequency calibration of the frequency synthesizer in the communication terminal working in the original one or more communication modes, if it is to be supported in the new communication mode When the frequency synthesizer in the communication terminal working under the same conditions is used for frequency calibration, it is necessary to re-upgrade or purchase an instrument and authorized software with a digital modem module supporting the new communication mode, because the cost is expensive, resulting in an increase in the cost of frequency calibration.
[0035] Because in the prior art, when the communication terminal transmits and receives signals, the signals are usually modulated in a certain way before being transmitted, so the received signal is a modulated signal, and different signal modulation methods are used in different communication modes, w...
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A calibration method, calibration device, and calibration system for a frequency synthesizer in a communication terminal, the calibration method for a frequency synthesizer in a communication terminal includes: controlling the communication terminal to measure a continuous wave signal of a designated channel to obtain the The frequency offset measurement value of the frequency synthesizer in the communication terminal; calculate the center oscillation frequency point and the corresponding frequency adjustment step of the reference crystal oscillator of the communication terminal based on the frequency offset measurement value; the center of the reference crystal oscillator The oscillation frequency points and their corresponding frequency adjustment steps are stored in the communication terminal. The technical scheme of the invention can save the cost of calibrating the frequency synthesizer in the communication terminal, and greatly optimize the frequency calibration time.
Description
technical field [0001] The invention relates to the field of communication technology, in particular to a calibration method, a calibration device and a calibration system for a frequency synthesizer in a communication terminal. Background technique [0002] The Long Term Evolution (LTE, Long Term Evolution) technology is the evolution of the third generation mobile communication technology (3G), which started at the 3GPP Toronto conference in 2004. LTE is not the fourth-generation mobile communication technology (4G) that is commonly misunderstood by people, but a transition between 3G and 4G technology. It is the global standard of 3.9G. Frequency division multiplexing technology (OFDM, Orthogonal Frequency Division Multiplexing) and multiple-input multiple-output technology (MIMO, Multiple-Input Multiple-Output) are the only standards for the evolution of its wireless network, which can provide downlink 326Mbit / s and The uplink peak rate of 86Mbit / s improves the performa...
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IPC IPC(8): H04B17/21
Inventor 许殿车永侠沈旭强
Owner SPREADTRUM COMM (SHANGHAI) CO LTD