A method and device for hybrid automatic gain control of a multimode system

Abstract

The invention relates to a hybrid automatic gain control device for a multimode system, which comprises a multimode system control module, a power calculation module, a DATT(digital attenuator) control module, a delay module, a digital down converter module and a gain compensation module, wherein the multimode system control module is used for initializing a mode control signal and a gain compensation control signal; the power calculation module is used for calculating a power of A / D (Analog to Digital) converter data according to the mode control signal; the DATT control module is used for calculating according to the input power to obtain a DATT control signal and regulating an attenuation stepping value of a DATT; the delay module is used for carrying out delay processing on the attenuation stepping value; the digital down converter module is used for processing the A / D converter data to obtain a plurality of single-mode digital signals; and the gain compensation module is used for respectively carrying out gain compensation processing on the single-mode digital signals by using the attenuation stepping value subjected to delay processing according to the gain compensation control signal. The invention also provides a hybrid automatic gain control method. By the hybrid automatic gain control method and the hybrid automatic gain control device, the sensitivity can be prevented from being influenced by the saturation of an ADC (Analog to Digital Converter) or an excessively low power caused by the rapid variation of an uplink signal power, and higher average signal to noise ratio performance is obtained.

Description

technical field [0001] The invention belongs to the field of mobile communication systems, in particular to a hybrid automatic gain control method and device for a multi-mode system. Background technique [0002] Automatic Gain Control (AGC, Automatic Gain Control) technology is an automatic control method that automatically adjusts the gain of the amplifying circuit with the signal strength, which can prevent the analog-to-digital converter (ADC, Analog-to-Digital Converter) from working in a saturated state or non In the linear region, a larger dynamic range of the receiver is obtained. AGC technology needs to monitor the signal power after the ADC in real time, and adjust the DATT (Digital Attenuator) of the uplink intermediate frequency and radio frequency according to a certain control strategy to obtain the dynamic variable gain of the analog circuit part, but in order to reduce For the deterioration of the performance index of the received signal, the control of DATT...

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Problems solved by technology

[0009] The purpose of the present invention is to provide a hybrid automatic gain control method and device for a multi-mode system, which can prevent the ADC from being saturated or the sensitivity is affected by too small power due to rapid changes in the uplink signal power, and solve the problem caused by the inconsistency of the automatic gain control parameters in the multi-mode system. The SNR deterioration problem of ADC obtains larger average SNR performance, so that the present invention can be applied to multimode systems such as GSM, CDMA, UMTS and LTE

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