Power line carrier communication automatic gain control method

Abstract

The invention discloses a power line carrier communication automatic gain control method, which comprises the following steps: calculating a characteristic function and a decision function; according to relation between the decision function and a detection threshold value and a pulse interference threshold value, calculating gain control amount; and during the process of calculating the gain control amount, according to the relation between the decision function and a preset threshold value and the pulse interference threshold value, stopping calculating the gain control amount and restarting the calculating process. According to the method, the received data can be used directly to carry out gain control judgment; the characteristic function is calculated through an iteration mode; difference between the current signal and the delay signal is calculated every time, and is subjected to add operation with the result obtained in the last calculation, thereby reducing calculation delay and complexity under the condition of ensuring gain calculation precision; and meanwhile, the pulse interference threshold value is set for resisting interference of noise to gain control. Therefore, the method is independent of frame synchronization or symbol synchronization information, can effectively prevent the interference of the noise on the gain control and simplifies gain control value computation complexity.

Description

technical field [0001] The invention belongs to the field of communication, and in particular relates to an automatic gain control method for power line carrier communication. Background technique [0002] At present, the domestic and foreign standard protocols adopted by the power line carrier communication system, such as PRIME, G3-PLC, Home PlugGreen PHY, etc., the frame structure can be summarized as follows: including preamble (Preamble), frame control header (FrameControl Head, FCH) and Data (Data) part. Its leading part is composed of a plurality of repeated basic symbol units (SYNCP) and the reverse phase symbol unit (SYNCM) of the opposite phase of the basic symbol unit, wherein the basic symbol unit is composed of a random sequence with predetermined characteristics; frame control header The part carries the parameters and configuration information of this transmission, and is composed of multiple symbols using a predetermined modulation mode; the data part carrie...

AI Technical Summary

Problems solved by technology

The disadvantages of the above method are: 1. Rely on the symbol boundary information provided by more accurate frame synchronization and symbol synchronization

2. One or more Fourier transforms / inverse transforms are involved in the calculation process, resulting in long calculation delay and high computational complexity

3. Fewer sample points are selected for calculation, the accuracy is low, and the resistance to noise is poor

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