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Apparatus for regulating automatic gain control voltage in diversity reception switch

A technology of automatic gain control and diversity reception, applied in the direction of space transmit diversity, diversity/multi-antenna system, etc., can solve the problems of fast fading without improvement

Inactive Publication Date: 2009-02-18
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if the received signal is switched or synthesized between two or more antennas with zero correlation and pointing in different directions to achieve the purpose of improving the signal strength, the direction diversity antenna has no effect on the wave generated by the high-speed movement of the receiving end. Fast fading of 1 / 4 wavelength between peaks does not improve

Method used

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  • Apparatus for regulating automatic gain control voltage in diversity reception switch
  • Apparatus for regulating automatic gain control voltage in diversity reception switch
  • Apparatus for regulating automatic gain control voltage in diversity reception switch

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Embodiment Construction

[0022] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings, and unnecessary details and functions for the present invention will be omitted during the description to prevent confusion in the understanding of the present invention.

[0023] Preferred embodiments of the present invention are described with reference to the accompanying drawings. Here, a diversity vehicle-mounted television receiver is adopted as a specific embodiment. It should be noted that the receiver of the present invention is not limited thereto, but can be applied to a wider range of applications.

[0024] Such as figure 1 As shown, the diversity receiver according to this embodiment is mainly composed of three parts, including diversity receiving antennas 37, 38, tuner 21, and received signal quality control part 22. Diversity reception antennas 37, 38 are used to receive signals. The tuner 21 includes tuning units 31 and 32 respectively ...

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Abstract

A diversity reception apparatus comprises a first tune unit for down-conversion of a received communication signal to an if signal and amplification of the if signal; a second tune unit for down-conversion of a received communication signal to an if signal and amplification of the if signal; a diversity reception control part for switching between a single reception mode and the diversity reception mode according to the received signal quality; and an automatic grain control part for controlling the control voltage supplied for if amplifiers in the first tune unit and the second tune unit.

Description

technical field [0001] The present invention relates to a signal receiving device, in particular to an automatic gain control (AGC) that automatically changes the gain control voltage of a receiving signal processing branch that has not been working before when switching between a single-set receiving mode and a diversity receiving mode. AGC) circuit, Background technique [0002] In the mobile communication system, the reflection of electromagnetic waves between the tall buildings in the city makes the electromagnetic wave environment in the communication complex, and will cause multipath fading to the transmitted signal. In addition, with the high-speed movement of vehicles (such as cars and trains), the Doppler effect and fast fading will occur on the transmission signal. These phenomena all have a negative impact on the receiving effect of the mobile device in the communication state. [0003] In order to overcome multipath fading, Doppler effect and fast fading, the d...

Claims

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Application Information

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IPC IPC(8): H04B7/08
Inventor 安安刘健
Owner PANASONIC CORP
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