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ofdm symbol synchronization method

A symbol synchronization and data technology, applied in the field of OFDM symbol synchronization, can solve the problems of inaccurate OFDM symbol timing, multiple interference peaks, optimal peak point offset and jitter, etc., to achieve obvious correlation peaks, reduced jitter, and accurate determination Effect

Active Publication Date: 2016-12-28
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION +1
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Problems solved by technology

[0013] The problem solved by the present invention is that there will be more interference peaks in the existing OFDM symbol synchronization method, which will cause offset and jitter in the theoretical optimal peak point, resulting in inaccurate OFDM symbol timing

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Embodiment Construction

[0028] The inventors found that using the existing OFDM symbol synchronization method, there will be more interference peaks, resulting in offset and jitter in the theoretical optimal peak point, resulting in inaccurate OFDM symbol timing. For this reason, the technical solution provides an OFDM symbol synchronization method to solve the problems in the prior art.

[0029] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0030] First, describe the overall structure of the OFDM system. Please refer to image 3 Shown is a schematic structural diagram of the OFDM system. Among them, the upper part corresponds to the transmitter link, and the lower part corresponds to the receiver link. Since the operations of Fourier transform and inverse Fourier transform are similar, the transmitter and re...

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Abstract

A method for synchronizing OFDM symbols, comprising: generating local frequency domain data, the local frequency domain data includes a plurality of pilot data, and the positions of the selected plurality of pilot data in the frequency domain are non-equal intervals; Perform inverse Fourier transform on the local frequency domain data to obtain local time domain data; add a cyclic prefix to the local time domain data to form time domain reference data, wherein the length of the cyclic prefix is ​​the OFDM symbol generated by the sending end Determine the length of the cyclic prefix; intercept multiple data sequences from the received OFDM time domain data, and perform correlation operations with the time domain reference data respectively to obtain multiple correlation calculation values; based on multiple correlation calculation values The maximum value is used to determine the timing point of the OFDM symbol. The technical solution solves the problem that in the prior art, there are many interference peaks, which cause offset and jitter in the theoretical optimal peak point, resulting in inaccurate timing of OFDM symbols.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to an OFDM symbol synchronization method. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology is the basis of the HPA Alliance (HomePlug Powerline Alliance) industrial specification, and is a multi-carrier modulation technology. OFDM technology inserts the cyclic prefix of the symbol at the front of the OFDM symbol, so it can effectively resist inter-symbol interference and better resist multipath channels. Moreover, adding a time-domain cyclic prefix makes the symbol timing deviation in a small range transferred to the frequency domain, which is expressed as a phase angle multiplied by each subcarrier symbol, which makes channel equalization in the frequency domain very convenient. Furthermore, since the subcarriers of the OFDM system are orthogonally overlapped with each other, the spectrum utilization rate is also improved co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 葛建华王磊刘刚李德言金丽芹张文军管云峰何大治
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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