Frame timing synchronization method and device of power line carrier

Abstract

The invention discloses a frame timing synchronization method and device for a power line carrier. The method comprises the following steps of: acquiring received data, superposing two continuous OFDM (Orthogonal Frequency Division Multiplexing) symbol length data, and performing correlation calculation on the superposed data and a standard SYNCP section symbol sequence; judging whether the correlation value is greater than a threshold value or not, further determining whether the segment of data has a frame header or not, acquiring the position of a symbol boundary of a frame in the data, aligning the symbol boundary by adjusting the position of the received data, and performing cross-correlation with SYNCP by symbol length offset; and when the correlation value is smaller than a threshold value, enabling the position to be a sign symbol junction so as to realize frame timing synchronization. Two continuous OFDM symbol length signals in signals received by a receiving end are superposed and then subjected to correlation calculation with a preset standard SYNCP segment symbol sequence, and existence of a data frame header and the initial position of a data frame are judged according to a comparison result of a correlation value and a threshold value, so that a correlation peak at the junction of positive and negative signals disappears to realize accurate frame synchronization.

Description

technical field [0001] The present invention relates to the technical field of power line communication, in particular to a frame timing synchronization method and device of power line carrier. Background technique [0002] In the current HPLC (highspeed power line communication) communication standard, the timing synchronization between transceivers is achieved through simple autocorrelation schemes and cross-correlation schemes for frame timing synchronization. For common standards for low-voltage power lines, the frame synchronization header usually has a continuous The positive synchronization code and negative synchronization code. A common method is to use the directionality of the correlation value to determine the position of the synchronous frame at the junction of positive and negative. [0003] like figure 1 As shown, the above technical solution has the following disadvantages: due to the non-ideality of the synchronization code, small side peaks in different d...

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Problems solved by technology

[0003] such as As shown in Figure 1, the above technical solution has the following disadvantages: due to the non-ideality of the synchronization code, small side peaks in different directions will appear near the correlation peak. When there is a frequency offset in the transceiver, the noise in the power line and The nonlinear characteristics of the channel make the shape of the correlation peak deformed, that is, the main correlation peak is smaller than the side peak, so that the direction of the correlation peak is wrongly judged, which leads to the wrong identification of the synchronization position, which leads to an increase in the frame error rate

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