Power calibration control method and device

A technology of power calibration and control method, applied in the field of communication, can solve the problems of adjacent channel signal interference and interference, etc.

Active Publication Date: 2011-04-13
ZTE CORP
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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 p

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Embodiment Construction

[0040] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] In the power calibration control method of the present invention, in the whole process of adjusting the total power, the intermodulation distortion is always suppressed to the extent of no interference to adjacent channels, thereby ensuring that the system has no interference during the whole period from start-up to stop operation.

[0042] The nonlinear distortion of the base station transmitter is mainly reflected in the nonlinear characteristics of the power amplifier in the transmitter. The nonlinearity can be described by the following polynomial, and only the 3rd order is listed here:

[0043] y=a 0 +a 1 x+a 2 x 2 +a 3 x 3 (1)

[0044] Among them, x is the input signal, y is the output signal, and a 0 、a 1 、a 2 and a 3 is the coefficient;

[0045] Suppose the input signal two-tone signal (ω1<ω2)...

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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...

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Application Information

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IPC IPC(8): H04W52/04
CPCH04B17/001H03G3/3042H04B17/13
Inventor 赵东亮
Owner ZTE CORP
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