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Timing synchronization method of OFDM (Orthogonal Frequency Division Multiplexing) power line carrier communication system

A power line carrier and communication system technology, applied in the field of data transmission, can solve problems such as strong interference and lower system performance, and achieve the effects of improving accuracy, improving system performance, and improving timing synchronization performance

Inactive Publication Date: 2013-02-13
INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0007] The present invention aims at the strong interference and strong attenuation brought by the power line channel environment to the timing synchronization of the OFDM power line carrier communication system, thereby reducing the system performance, and provides a timing synchronization method for the OFDM power line carrier communication system

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  • Timing synchronization method of OFDM (Orthogonal Frequency Division Multiplexing) power line carrier communication system
  • Timing synchronization method of OFDM (Orthogonal Frequency Division Multiplexing) power line carrier communication system
  • Timing synchronization method of OFDM (Orthogonal Frequency Division Multiplexing) power line carrier communication system

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Embodiment Construction

[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0030] Such as figure 1 as shown, figure 1 It is a flowchart of a timing synchronization method for an OFDM power line carrier communication system according to an embodiment of the present invention, the method includes the following steps:

[0031] Step 101: Calculate the cross-correlation value corr between the preamble sequence of the signal at the receiving end of the power line carrier communication system and the signal sent from the sending end to the receiving end;

[0032] In the step 101, the calculation of the cross-correlation value corr between the preamble sequence of the signal at the receiving end of the power line carrier communication system and the signal sent from the transmitting end to the receivin...

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Abstract

The invention discloses a timing synchronization method of an OFDM (Orthogonal Frequency Division Multiplexing) power line carrier communication system in a power line channel. The method comprises the following steps: calculating a cross-correlation value corr of a preamble sequence of a receiving end signal of the power line carrier communication system and a signal transmitted from a receiving end to the receiving end; successively searching the cross-correlation value corr of each receiving end signal on the receiving end of the power line carrier communication system, and determining the positions of the two foremost preamble sequences; on the basis of finding the positions of the two foremost preamble sequences, calculating time delay correlation values xdelay(1) and xdelay(2) of the positions corresponding to the two preamble sequences, determining whether the following condition is met: if the condition is met, the timing synchronization is correct, determining windowing position of timing synchronization, otherwise the synchronization is determined to be false synchronization; and continuing to search synchronous state. By adopting the timing synchronization method provided by the invention, the capability of the power line carrier communication system resisting strong interference and strong attenuation of the power line channel can be effectively improved, and in turn the system performance is improved.

Description

technical field [0001] The present invention relates to the technical field of data transmission, in particular to a timing synchronization method for an Orthogonal Frequency Division Multiplexing (OFDM) power line carrier communication system under a power line channel. Background technique [0002] Synchronization technology is a practical problem that any communication system needs to solve, and its performance is directly related to the performance of the entire communication system. Without accurate synchronization, reliable data transmission is impossible. Specifically, synchronization can be divided into timing synchronization, sampling synchronization and carrier synchronization. Among them, the purpose of timing synchronization is to determine the start and end moments of each symbol, and then achieve fast synchronization; sampling synchronization is to eliminate the deviation caused by sampling at the sending end and receiving end; carrier synchronization is to en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B3/54
Inventor 黑勇李春阳乔树山
Owner INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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