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Automatic gain control method based on encoding orthogonal frequency division multiplexing

A technology of automatic gain control and orthogonal frequency division, which is applied in the field of data processing and can solve problems such as not being widely used

Inactive Publication Date: 2013-09-04
HUADONG PHOTOELECTRIC TECHN INST OF ANHUI PROVINCE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Hybrid AGC can overcome the shortcomings of both feedforward AGC and feedback AGC, especially suitable for fast fading channels, but due to the impact of cost, volume, power consumption and complexity, etc., it is not widely used in practice, and feedback Type AGC, stable system performance

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  • Automatic gain control method based on encoding orthogonal frequency division multiplexing
  • Automatic gain control method based on encoding orthogonal frequency division multiplexing
  • Automatic gain control method based on encoding orthogonal frequency division multiplexing

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0024] There are three types of AGC circuit implementations: feedforward, feedback, and hybrid loops. The convergence speed of feedforward AGC is faster than that of feedback AGC, but it is generally not very stable. Hybrid AGC can overcome the shortcomings of both feedforward AGC and feedback AGC, especially suitable for fast fading channels, but due to the impact of cost, volume, power consumption and complexity, it is not widely used in practice. Therefore, the feedback AGC is used in this system, such as figure 1 As shown, the automatic gain control method based on COFDM of the present inventi...

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Abstract

The invention discloses an automatic gain control method based on encoding orthogonal frequency division multiplexing. The automatic gain control method comprises the following steps: the average power Pin of mimic input signals of a VGA interface is set to meet a formula requirement, the average power Pout of mimic output signals of the VGA interface meets the formula requirement, wherein N is the sample accumulation number, and the relational expression of the average power Pin of the mimic input signals and the average power Pout of the mimic output signals is that the average power Pout of the mimic output signals is adjusted by adjusting the gain g of the VGA interface. The adjustment comprises the steps of conducting analog-digital conversion on the average power Pout of the mimic output signals to gain digital signal, comparing the digital signals with ideal digital signals, calculating the adjustment value of the gain g of the VGA interface, conducting digital-to-analogue conversion on the adjustment value to obtain analog signals, and changing the gain g of the VGA interface according to the analog signals.

Description

technical field [0001] The invention belongs to the field of data processing, and in particular relates to an automatic gain control method based on coded orthogonal frequency division multiplexing. Background technique [0002] Code Orthogonal Frequency Division Multiplexing (COFDM) is a new type of data processing technology. With its high spectrum utilization, high transmission rate and strong anti-multipath interference ability, it is widely used in wireless image transmission. field has attracted widespread attention. [0003] In the high-definition video wireless transmission system, it is necessary to quickly and efficiently transmit high-quality, high-reliability image, sound, text and other data information to the receiver. However, various disadvantages such as stray electromagnetic interference and poor space channel often occur during the actual transmission process. factors, the signal power received by the receiving end is extremely low, which will greatly inc...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04W52/52
Inventor 吴华夏丁冬平徐劲松邴志光张铭权
Owner HUADONG PHOTOELECTRIC TECHN INST OF ANHUI PROVINCE