Power calibration control method and device

Abstract

The invention provides a power calibration control method and device. The method comprises the following steps: adjusting a digital domain gain to realize power balance among digital domain baseband carriers, and enabling the baseband combined wave power to achieve a designated value; computing the variation to be adjusted, which is needed by the analog domain gain, when the antenna port total power achieves a preset value; controlling the digital domain gain to wholly lower the variation; controlling the analog domain gain to increase the variation; and gradually increasing the digital domain gain until the antenna port total power achieves the preset value. Since the digital domain is not in a digital predistortion (DPD) loop, the adjustment of the digital domain gain can not influence the DPD loop gain or has no adverse effect on the operation of DPD; and thus, by using the invention, the system can be free from interference in the whole period from starting to shut-down.

Description

technical field [0001] The present invention relates to the field of communication technologies, in particular to a power calibration control method and device. Background technique [0002] In the modern wireless communication system, due to the very limited spectrum resources, how to suppress the power leakage of the transmitted signal to the adjacent channel caused by the nonlinear distortion of the base station transmitter, so as to avoid adjacent channel interference and improve the spectrum utilization, is the current base station communication system. one of the key technologies. In the code division multiple access (CDMA) communication system, CDMA is a wideband modulated signal that not only has very tight spectral components, but also has a high peak signal (called crest factor), which comes from nonlinear distortion due to The intermodulation products of the signal's own spectrum components tend to fall around the CDMA spectrum, thereby falling into the signal ba...

AI Technical Summary

Problems solved by technology

However, due to the impact of the transmit link gain adjustment on the closed-loop pre-distortion system during the power calibration process, the power calibration process of the existing system is often placed before the pre-distortion function is turned on, then after the power calibration process is completed and the pre-distortion function is fully operational Previously, when the transmitted signal of the base station transmitter was not pre-distorted or the pre-distortion function was activated, very serious intermodulation products would be generated, which would cause serious interference to adjacent channel signals

Although this kind of interference will be eliminated after the pre-distortion function is turned on, for communication frequency bands involving national security such as military and civil aviation, or when radio control is relatively strict, this short-term burst of serious interference is not allowed of

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