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OFDM symbol timing deviation estimation method

A symbol timing deviation and symbol timing technology, applied in digital transmission systems, electrical components, modulated carrier systems, etc., can solve problems such as low accuracy and system performance degradation, and achieve high accuracy and improve synchronization performance.

Inactive Publication Date: 2019-09-06
ZHEJIANG WELLSUN INTELLIGENT TECH CO LTD
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AI Technical Summary

Problems solved by technology

In the low-voltage power line transmission network, due to the influence of multipath effects, when the H.minn algorithm is used to estimate the symbol timing deviation, the accuracy is low, resulting in system performance degradation

Method used

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  • OFDM symbol timing deviation estimation method
  • OFDM symbol timing deviation estimation method
  • OFDM symbol timing deviation estimation method

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Embodiment Construction

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention.

[0038] In order to better understand the embodiments of the present invention, the related probabilities involved are explained as follows:

[0039] A physical channel refers to a channel for transmitting information based on physical media, such as telephone lines, optical fibers, coaxial, and microwaves. The sliding window algorithm is similar to the window jumping algorithm. The sliding window algorithm also controls the traffic by limiting the maximum number of cells that can be received in each time window. The difference is that in the sliding window algorithm, the time window does not jump forward, but slides forward every time a cell passes, and the sliding length is the time of one cell. Phase is where a wave is at a particular moment in its cycle: a m...

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Abstract

The invention discloses an OFDM symbol timing deviation estimation method. The OFDM symbol timing deviation estimation method comprises: receiving a transmitting signal sent by a transmitting end, thetransmitting signal comprising an IEEE1901.1 protocol preamble sequence signal, and transmitting the transmitting signal to a receiving end through a low-voltage power line physical channel; processing the received transmitting signal by using a sliding window to obtain a symbol timing metric function of the received transmitting signal; and obtaining the symbol timing deviation of the OFDM system according to the symbol timing metric function. The purposes that the algorithm has higher accuracy in a low-voltage power line transmission environment and the overall performance of the system isimproved are achieved.

Description

technical field [0001] The invention relates to the technical field of power communication, in particular to a method for estimating OFDM symbol timing deviation. Background technique [0002] The rapid development of the smart grid has made the high-speed power line carrier communication (HPLC) technology a research hotspot. The power line network has a wide coverage, convenient engineering implementation and fast construction speed. The use of power line network communication does not require wiring, which greatly reduces costs. With the improvement of people's requirements and the increase of business volume, the narrow-band power line communication technology can no longer meet the requirements due to its low transmission rate, and the development of high-speed power line communication technology is imperative. As a technical method of broadband access, HPLC can already realize high-speed data transmission. [0003] Orthogonal Frequency Division Multiplexing (OFDM) tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2665H04L27/2675
Inventor 丁剑飞邬永强李兆刚章为昆孙德春陈德才
Owner ZHEJIANG WELLSUN INTELLIGENT TECH CO LTD
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