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A method and device for automatic gain control and frame detection

A technology of automatic gain control and frame detection, which is applied to the shaping network and baseband system components in the transmitter/receiver. achieve the effect of avoiding false synchronization

Active Publication Date: 2017-12-26
BEIJING UNIV OF POSTS & TELECOMM
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] 1. The threshold of the AGC module is determined in advance based on empirical values ​​or hardware conditions, and cannot well adapt to the complexity and variability of actual channels.
[0008] 2. The traditional sliding window delay correlation algorithm will fail in some noise environments, resulting in missynchronization

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  • A method and device for automatic gain control and frame detection
  • A method and device for automatic gain control and frame detection
  • A method and device for automatic gain control and frame detection

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Embodiment Construction

[0039] In order to make the purpose, technical means and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0040] see figure 2 , is the receiver front-end closed-loop feedback system constructed in the present invention.

[0041] The present invention is aimed at the receiver in the WLAN wireless local area network. In order to improve its reliability and effectiveness, a closed-loop feedback system is constructed at the front end, and the intermediate information generated by the automatic gain control AGC is used to assist the frame detection, and the frame detection statistical information will be fed back at the same time. AGC adaptive adjustment threshold. In this way, the combined self-optimization process of AGC and frame detection not only reduces the loss of hardware resources, reduces the probability of false synchronization caused by noise, but also impr...

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Abstract

This application discloses a method for automatic gain control and frame detection in a wireless local area network, including two aspects of automatic gain control assisted frame detection and frame detection statistical information feedback automatic gain control: frame detection uses signal energy information generated by automatic gain control first Perform energy coarse synchronization, and then use training sequence correlation to perform fine synchronization; automatic gain control uses the effective data amplitude value information of frame detection statistics to adaptively adjust the threshold according to the current channel environment. The advantage of the present invention is that the false synchronization caused by noise is reduced in the frame detection part, and the accuracy of the automatic gain control threshold is improved at the same time; Greatly improve.

Description

technical field [0001] The invention relates to wireless local area network technology, in particular to a method and device for automatic gain control (AGC) and frame detection. Background technique [0002] WLAN (Wireless Local Area Networks) is popular in today's multimedia communication because of its superior mobility and scalability, and it is one of the most promising technologies in the field of wireless communication in the new century. It is a data transmission system based on the IEEE 802.11 standard. It uses radio frequency (RF) technology to replace the local area network formed by the old twisted-pair copper wires (Coaxial). It uses wireless technology to transmit data, voice and video in the air. Signal enables WLAN to use a simple access architecture, allowing users to enjoy high-speed wireless access and move freely within the network without the shackles of network cables. [0003] In a WLAN communication system, the signal strength received by the receive...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L25/03
Inventor 梁栋王振东陈东涌靳浩王文博
Owner BEIJING UNIV OF POSTS & TELECOMM