Synchronizing method of high-speed mobile OFDM (orthogonal frequency division multiplexing) system

A high-speed mobile and coarse synchronization technology, which is applied to the synchronization field of high-speed mobile OFDM systems, and can solve the problems of increased bit error rate, easy misjudgment, and OFDM symbol timing interference in OFDM systems.

Inactive Publication Date: 2013-03-20
NANTONG UNIVERSITY
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Problems solved by technology

Depend on Figure 2A and Figure 2B It can be seen that the curve of the metric function M(d) has a platform, and the existence of the platform makes it easy to misjudgment when deter

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  • Synchronizing method of high-speed mobile OFDM (orthogonal frequency division multiplexing) system
  • Synchronizing method of high-speed mobile OFDM (orthogonal frequency division multiplexing) system
  • Synchronizing method of high-speed mobile OFDM (orthogonal frequency division multiplexing) system

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Embodiment Construction

[0046] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0047] image 3 It is a flowchart of an embodiment of the synchronization method of the OFDM system of the present invention, such as image 3 As shown, the synchronization method in this embodiment includes:

[0048] Step 101, using 10 repeated short training sequences to determine the position of coarse synchronization.

[0049]This step utilizes the first 10 symbols in the frame structure of IEEE802.11p to carry out rough synchronization. The 10 repeated short training sequences are 10 identical short preambles. In specific implementation, the Schmidl&Cox method based on short preamble autocorrelation can be used, namely Determined according to the measurement function M(d) defined by the aforementioned formula (1), in practical applications, the first point of the measurement function M(d) greater than the threshold can be set. After the coarse...

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Abstract

The invention discloses a synchronizing method of a high-speed mobile OFDM system. The method comprises the following steps: utilizing the first 10 identical short lead codes in a frame structure of a wireless LAN (local area network) protocol to determine the coarse synchronizing location; according to the coarse synchronizing location, extracting 2 identical long lead codes in a receiving signal and combining with a sliding window to perform fine synchronization; converting the transmitted known long lead codes into a time domain; calculating the mutual correlation value of the extracted long lead codes and the transmitted known long lead codes; determining the maximum of absolute value of the mutual correlation value and the location index corresponding to the maximum; setting the initial value of the preset sliding window; determining the sliding direction of the preset sliding window according to the location index corresponding to the maximum and the set threshold value index, performing fine synchronization, and determining the initial position of the long lead codes. The synchronizing method is applicable to accurately determining the synchronized position of the received information symbol for the OFDM system under the high-speed mobile vehicle-mounted IEEE 802.11p protocol.

Description

technical field [0001] The invention relates to communication technology, in particular to a synchronization method of a high-speed mobile OFDM system. Background technique [0002] One of the core technologies of the intelligent transportation system is the short-range communication system (also known as dedicated short-range communication, Dedicated Short Range Communications, DSRC) suitable for the transportation field. At present, all countries are paying great attention to the research of traffic-specific short-range communication systems, and constantly put forward new methods, new theories and new products. In recent years, with the development of DSRC technology and theory, how to reasonably solve the vehicle-to-vehicle communication problem has become a new research hotspot. Among various traffic-specific short-range communication systems, the IEEE802.11pTM / D5.0, November 2008 (hereinafter referred to as IEEE802.11p) standard has been valued for its superior perfor...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 金婕宋昆仑景为平夏峻彭飞
Owner NANTONG UNIVERSITY
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