Automatic grain control method and device for diversity receiving

Abstract

The invention discloses an automatic grain control method and an automatic grain control device for diversity receiving. The automatic gain control device is positioned in a mobile terminal having a diversity receiving module and comprises more than one automatic gain control sub-devices and a power signal processing module, wherein each automatic gain control sub-device is connected with a terminal antenna and all automatic gain control sub-devices are connected with the diversity receiving module; each automatic gain control sub-device comprises a power estimation module and an error calculation module; the input end of the power signal processing module is connected with all power estimation modules and the output end of the power signal processing module is connected with all error calculation modules; and the power signal processing module is used for determining a middle power signal, of which the amplitude is between the maximum amplitude and minimum amplitude of power signals, as the output signal of each power estimation modules according to the power signals output by the power estimation modules, and outputting the middle power signals to corresponding error calculation modules. The invention can improve the performance of a single-antenna receiving module and a double-antenna receiving module.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to an automatic gain control method and device for diversity reception. Background technique [0002] In the mobile communication system, when the signal reaches the receiving antenna through the wireless channel, the power of the signal usually has a large dynamic fluctuation range due to the influence of various fading and interference; in order to make the terminal receiver adapt to the larger signal To improve the dynamic range, and more effectively use the analog-to-digital conversion module for data processing, an automatic gain control (Automatic Gain Control, AGC for short) device is usually installed in the terminal receiver. Generally, the AGC device of the terminal mainly includes an analog variable gain amplifier (Variable Gain Amplifier, referred to as VGA), a low noise amplifier, an analog-to-digital converter (Analog-to-Digital Converter, referr...

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Problems solved by technology

For example, always select the power of the stronger signal of the two signals for gain control calculation to ensure that the two signals have roughly the same noise amplitude and keep the amplitude of the strong signal moderate; The signal will change in strength and weakness

In some cases, the receiving end needs to support both a single-antenna processing module and a dual-antenna processing module. The single-antenna module is not convenient to switch between the two signals, and usually only receives a fixed signal. Variations can result in degraded performance for single-antenna modules

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