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WLAN system frame synchronization method based on OFDM technology

A system frame, frame synchronization technology, applied in the direction of advanced technology, synchronization device, multi-frequency code system, etc., can solve the problems of time loss and increase equipment burden.

Active Publication Date: 2014-07-23
XIAN STARPOINT INFORMATION TECH
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Problems solved by technology

[0006] The synchronization technology in the OFDM system mainly uses the method of correlation sequence for correlation synchronization, and this method is widely accepted, but for general WLAN equipment, non-stop correlation calculations will bring time loss and increase equipment burden

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  • WLAN system frame synchronization method based on OFDM technology
  • WLAN system frame synchronization method based on OFDM technology
  • WLAN system frame synchronization method based on OFDM technology

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Embodiment Construction

[0054] A kind of MIMO-OFDM system frame synchronization method based on WLAN of the present invention is described in detail below in conjunction with accompanying drawing:

[0055] The technical solution adopted by the present invention is to perform related processing on the received signal itself received by the receiver, thereby obtaining the synchronous position, which is divided into two parts, frame detection and frame head positioning.

[0056] The frame detection includes the following steps: storing Tμs received signal sampling data. Let the detection window length be w. Select the minimum frame interval t between two wireless frames under the current 802.11 protocol. Select the size of the noise detection window as w=t / 2. Calculate the sliding times of each detection window as L=floor(T / w), where floor(x) means taking the largest integer value less than or equal to x. The detection needs to be carried out within m consecutive Tμs. m can be selected according to t...

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Abstract

The invention provides a WLAN system frame synchronization method based on the OFDM technology. After a receiving antenna receives radio frequency signals, the radio frequency signals are converted into digital baseband signals, a detection threshold is determined through a frame detection algorithm with the noise power detected through a sliding window method, and frame detection is performed on the signals according to the hopping property of the signals. Through the algorithm, the frame header can be stably detected in continuously changing channel space. Two methods are adopted for the frame header positioning algorithm. According to the first method, operation is performed through the self characteristics of the received signals, and through the characteristic that the front half of data of a short training sequence is the conjugate of data obtained by multiplying the second half of the data by (-j), frame synchronization is performed with a circular moving correlation and addition method; according to the second method, correlation is performed through a local training sequence and the received signals. The beginning position of the signals can be found fast with both the methods, and thus a receiver can better recover received data conveniently. Through the WLAN system frame synchronization method based on the OFDM technology, spurious correlation peaks existing in a traditional method can be avoided, and the accuracy of synchronization can be improved.

Description

technical field [0001] The invention relates to a frame synchronization method of a WLAN system based on OFDM technology. Background technique [0002] With the rapid development of various multimedia technologies, people have put forward higher and higher requirements for wireless mobile communication systems in terms of transmission rate, transmission efficiency and service quality. The development of WLAN (Wireless Local Area Network, WLAN) has brought a major impact on people's daily life. People can obtain information anytime and anywhere, which improves work efficiency. favored and widely used. Various standards in the IEEE802.11 series adopt OFDM technology. [0003] The IEEE802.11 protocol group is a standard developed by the International Institute of Electrical and Electronic Engineering (IEEE) for wireless local area networks. There are many 802.11 protocol standards, and 802.11b / g / n is widely used, among which 802.11g adopts OFDM technology, and 802.11n and 80...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04W56/00
CPCY02D30/70
Inventor 范莉爽代琳迟帅姬翔康永强
Owner XIAN STARPOINT INFORMATION TECH