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Automatic gain control method and device

A technology of automatic gain control and time-domain signals, applied in electrical components, power management, multi-frequency code systems, etc., can solve problems affecting system demodulation performance and receiver performance, and achieve the effect of avoiding impact and reducing precision loss

Active Publication Date: 2012-07-04
DATANG MOBILE COMM EQUIP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In view of this, the present invention provides an automatic gain control method and device to overcome the problem that the demodulation performance of the system and the performance of the receiver in the system will be affected when the traditional method and device are used for gain control

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  • Automatic gain control method and device

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Embodiment Construction

[0057] For reference and clarity, descriptions, abbreviations or abbreviations of technical terms used in the following text are summarized as follows:

[0058] OFDM: Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing;

[0059] AGC: Automatic Gain Control, automatic gain control;

[0060] CP: Cyclic Prefix, cyclic prefix;

[0061] FFT: fast Fourier transform;

[0062] RE: Resource Element, resource unit;

[0063] RS: Reference Signal, reference signal.

[0064] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection...

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Abstract

The invention discloses an automatic gain control method and device. The method comprises the following steps: receiving an OFDM (orthogonal frequency division multiplexing) time domain signal, converting the OFDM time domain signal to a base band to be processed, and converting the base band into a frequency domain to obtain a corresponding OFDM frequency domain signal; extracting an effective subcarrier of the OFDM frequency domain signal; computing a power ratio of received power on a virtual subcarrier part of the OFDM frequency domain signal to received power on the effective subcarrier part; when the power ratio is greater than a preset threshold value, data on the effective subcarrier is shifted left; and otherwise, data on the effective subcarrier is not shifted left. Through the method and the device, automatic gain control under the condition of smaller interference on the virtual subcarrier part can be realized, and data on the effective subcarrier part can be amplified under the condition of larger interference on the virtual subcarrier part, so that precision loss of subsequent processing is reduced conveniently, influences a on subsequent demodulation performance and the overall performance of a receiver are avoided, and better automatic gain control effect is achieved.

Description

technical field [0001] The present invention relates to the technical field of wireless mobile communication, and more specifically relates to an automatic gain control method and device suitable for OFDM (Orthogonal Frequency Division Multiplexing) systems. Background technique [0002] In the current field of wireless mobile communication technology, OFDM is a multi-carrier modulation technology, which mainly converts high-speed data signals into parallel low-speed sub-data streams, and then modulates them on each orthogonal sub-carrier for transmission. Ideally, the signals on the orthogonal subcarriers do not interfere with each other, and the signal bandwidth on each subcarrier is smaller than the relevant bandwidth of the channel, so the bandwidth on each subcarrier is only a small part of the original channel bandwidth, and channel equalization becomes relatively easy. Because of its high spectral efficiency and the ability to deal with intersymbol interference cause...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04W52/52
Inventor 徐兵
Owner DATANG MOBILE COMM EQUIP CO LTD
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