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A Multi-frame Synchronization Method Based on Orthogonal Frequency Division Multiplexing Technology Based on IEEE802.11 Protocol

A technology of orthogonal frequency division and multiplexing technology, which is applied in the field of frame synchronization of mobile communication technology, and can solve the problems of increasing equipment burden and time loss.

Active Publication Date: 2019-07-19
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

For general WLAN equipment, non-stop correlation calculation will bring time loss and increase equipment burden

Method used

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  • A Multi-frame Synchronization Method Based on Orthogonal Frequency Division Multiplexing Technology Based on IEEE802.11 Protocol
  • A Multi-frame Synchronization Method Based on Orthogonal Frequency Division Multiplexing Technology Based on IEEE802.11 Protocol
  • A Multi-frame Synchronization Method Based on Orthogonal Frequency Division Multiplexing Technology Based on IEEE802.11 Protocol

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Embodiment Construction

[0029] The technical solutions in the embodiments of the present invention will be described clearly and in detail below with reference to the drawings in the embodiments of the present invention. The described embodiments are only some of the embodiments of the invention.

[0030] The technical scheme that the present invention solves the above-mentioned technical problem is, design a kind of OFDM technique multi-frame synchronization method based on IEEE802.11a, this method comprises the following processing steps:

[0031] 1. Use the silent period before the arrival of the burst frame to complete the rough synchronization frame header estimation, and determine the parameters mainly including the sliding window W coarse , threshold T coarse And the received signal is r(d), d represents the current window position; starting from d=1, calculate W coarse The total power of the signal in the window and the interval W coarse The power ratio in the next window, the ratio and T ...

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Abstract

The present invention provides an OFDM (Orthogonal Frequency Division Multiplexing) technology multi-frame synchronization method based on IEEE802.11 protocol, relates to the communication technology, and realizes the identification of the frame header and the frame tail of a baseband signal multiple burst frame of a receiving terminal. The method comprises: employing the baseband signal silent period of a receiver to complete rough synchronization frame header estimation; capturing the minimum frame length after the rough synchronization, and obtaining the fine synchronization frame header estimation according to the short training sequence sliding autocorrelation in the minimum frame length; obtaining the frame tail estimation according to the power mutability according to the silent period of the frame tail symbol prior to the next frame; and capturing the data repeat detection after the frame is end until all the burst frames included in the receiving signals are detected. The orthogonal frequency division multiplexing technology multi-frame synchronization method based on the IEEE802.11 protocol employs the features of the receiving signals themselves to complete the multiple burst frame synchronization of the receiver terminal to reduce the realization difficulty and the algorithm complexity and provide a simple and efficient solution scheme for the frame synchronization of the baseband signal multiple burst frames.

Description

technical field [0001] The invention relates to the field of frame synchronization of mobile communication technology, in particular to a multi-frame synchronization method of OFDM technology based on IEEE802.11a. Background technique [0002] In communication, due to the multipath and time-varying nature of the actual wireless channel, the synchronization position of the OFDM system needs to have high accuracy to ensure the performance of the system. The block diagram of the receiver system of a general communication system is as follows: figure 1 As shown, the modules involved in the present invention are figure 1 in the "Frame Synchronization" section. [0003] The baseband signal conforming to IEEE802.11a standard protocol consists of short training sequence, long training sequence, signal and data symbols, such as figure 2 shown. [0004] In the IEEE802.11a system, frame synchronization often uses four repeated short training sequences to complete timing synchroniz...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/2656H04L27/2663
Inventor 张祖凡周建萍何维
Owner CHONGQING UNIV OF POSTS & TELECOMM
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