Frame preamble structure design method for power line communication and synchronous detection method and device

Abstract

The invention provides a frame preamble structure encoding design method for power line communication. According to the method, a plurality of encoding modes are introduced into the structural design of a preamble portion, and each encoding mode carries unique location information. The invention further provides a synchronous detection method and device based on the frame preamble structure encoding design method. A peak sequence structure code is obtained by signing and encoding a cross-correlation peak sequence of a predetermined length, and a frame synchronization location is determined according to unique synchronization location information corresponding to a valid structure code. The frame preamble structure encoding design method has the beneficial effects that the synchronization location can be determined without detecting the end of the preamble portion, and a comprehensive judgment can be made via multiple types of location information in order to increase the detection accuracy, thereby greatly enhancing the robustness and detection speed of synchronous detection.

Description

technical field [0001] The present invention relates to power line communication, in particular to frame structure and signal detection and synchronization of narrowband power line communication. Background technique [0002] The preamble is an important part of the frame structure, and it is designed to realize various functions such as signal detection, synchronization, automatic gain control, and channel estimation, and correct signal detection and synchronization are the basis for realizing other functions. The preamble of the OFDM system is usually designed with a series of repeated unit symbols, thereby providing correlation between data, so as to facilitate the identification of the receiver. The pattern of repeated unit symbols directly affects the design of signal detection and synchronization algorithms. [0003] The narrowband power line carrier communication G3-PLC standard uses the OFDM communication method, such as figure 1 As shown, its frame structure includ...

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Problems solved by technology

However, when the noise lasts for a long time, this frame structure is still difficult to ensure the success of frame synchronization at the receiving end

[0008] Analyzing the existing technology, an important reason for the loss or inaccuracy of synchronization is that the structural design of the leading part is simple, the information provided is limited, and it is susceptible to interference and is relatively vulnerable. Whether it is a reverse phase identification of the G3-PLC standard The point is also the two reverse identification points of the ITU-T G.hnem standard. Once these identification points are disturbed, it will be difficult to perform frame synchronization detection or cause frame synchronization detection to be inaccurate.

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