Power line carrier communication signal processing method and device

Abstract

The invention provides a power line carrier communication signal processing method. The method comprises the following steps of S1, calculating a first judgment function and a second judgment function for a signal sequence in a cache window; S2, actuating S3 when the current first judgment function is judged to be greater than a first threshold value, and otherwise returning to S1; S3, actuating S5 if the current second judgment function satisfies a peak value condition, and otherwise searching a peak value point in the cached second judgment function; S4, returning to S1 if no peak value point is searched in the step S3 and the detection length is not reached, and otherwise, actuating S5; S5, updating a first count number, returning to S1 if the first count number does not reach a first preset value, and otherwise determining the signal is detected. The invention also provides a power line carrier communication signal processing device. By adopting the power line carrier communication signal processing method and device, the signal detection and synchronizing process is simplified, the detection and synchronizing time is shortened, and the detection and synchronizing precision is also improved.

Description

technical field [0001] The invention relates to power line carrier communication, in particular to signal detection and synchronization of narrowband power line carrier communication G3-PLC standard. Background technique [0002] Narrowband power line carrier communication G3-PLC standard uses OFDM multi-carrier communication, such as figure 1 As shown, its frame structure includes preamble part, frame control header part (FCH) and data part. The leading part is used for multiple functions such as signal detection, synchronization, automatic gain control and channel estimation, among which, correct and efficient signal detection and synchronization is the basis for realizing other functions. [0003] The leading part consists of 8 identical basic symbol units (SYNCP) and 1.5 inverse symbol units (SYNCM) which are opposite to the phase of SYNCP. Each symbol unit is composed of a random sequence with good cross-correlation properties, such as a Zad-offChu sequence, and its l...

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Problems solved by technology

[0028] The signal detection and synchronization methods in the prior art do not combine the connection between signal detection and cross-correlation peaks. The problem is that the detection time and synchronization time are relatively long. The first threshold is 0.5, and the delay window width L is 1 Take the length of the basic symbol unit as an example. Ideally, 1.5+Δ basic symbol unit lengths are required to complete signal detection, where Δ depends on the set time that lasts greater than the first threshold

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