Multi-path adjustment method for orthogonal frequency division multiplexing (OFDM) power line carrier communication system

A power line carrier and communication system technology, applied in the field of data transmission, can solve the problems of OFDM power line carrier communication system timing synchronization interference, system performance degradation, etc., to achieve the effects of reducing interference, improving system performance, and improving accuracy

Active Publication Date: 2013-02-13
锐立平芯微电子(广州)有限责任公司
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Problems solved by technology

[0006] Aiming at the problem that the multipath environment brings interference to the timing synchronization of the OFDM power line carrier communication system, thereby reducing system performance, the present invention provides a multipath adjustment method for the OFDM power line carrier communication system

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  • Multi-path adjustment method for orthogonal frequency division multiplexing (OFDM) power line carrier communication system
  • Multi-path adjustment method for orthogonal frequency division multiplexing (OFDM) power line carrier communication system
  • Multi-path adjustment method for orthogonal frequency division multiplexing (OFDM) power line carrier communication system

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[0024] 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.

[0025] like figure 1 as shown, figure 1 It is a flowchart of a multipath adjustment method for an OFDM power line carrier communication system according to an embodiment of the present invention, and the method includes the following steps:

[0026] Step 101: take the synchronously calculated fast Fourier transform (Fast Fourier Transform, FFT) window opening position as the zero point, and perform FFT calculations at 0-L sampling points forward in turn; L is the maximum possible multipath deviation, which is An experience value, generally you can choose L=20;

[0027] The FFT windowing position synchronously calculated in step 101 refers to the initial position of the frame structure calculated by the receiver synchron...

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Abstract

The invention discloses a multi-path adjustment method for an orthogonal frequency division multiplexing (OFDM) power line carrier communication system. The method comprises the following steps of: respectively performing fast Fourier transform (FFT) calculation on the first 0-L sampling points by taking a synchronously calculated FFT windowing position as a zero point; according to (L+1) FFT calculation results, respectively extracting phase information of a pilot part in each FFT result; calculating a standard difference of a corresponding pilot phase after each displacement; and taking the minimum standard difference after each displacement as a final FFT windowing position. By the method, the problem that the system performance is reduced because of wrong judgment of correlated peak values caused by multi-path information can be effectively solved.

Description

technical field [0001] The present invention relates to the technical field of data transmission, in particular to a multipath adjustment method for an Orthogonal Frequency Division Multiplexing (OFDM) power line carrier communication system. 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 ensure that the receiving end a...

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Application Information

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IPC IPC(8): H04L27/26H04B3/54
Inventor 黑勇李春阳乔树山
Owner 锐立平芯微电子(广州)有限责任公司
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