Clock skew calculation and compensation system and method for PLC module

Abstract

The invention discloses a clock skew calculation and compensation system and method for a PLC module, the system comprises a clock correction module and the PLC module, the clock correction module is used for sending a first characteristic signal to the PLC module at an interval of delta T hours, and the first characteristic signal is used for calculating the clock skew of the clock correction module and the PLC module; and the PLC module is used for transmitting and / or receiving carrier data, receiving the first characteristic signal sent by the clock correction module, calculating a clock deviation value of the clock correction module and the PLC module according to the first characteristic signal, and performing clock compensation on the carrier data to be transmitted or received according to the clock deviation value. The system and the method can eliminate reception performance reduction caused by clock skew between the PLC modules, can obviously improve communication efficiency and success rate of the PLC modules, and can save installation time and reduce maintenance resources in field use.

Description

technical field [0001] The invention belongs to the field of carrier communication, and in particular relates to a clock deviation calculation and compensation system and method of a PLC module. Background technique [0002] At the physical layer of a communication system, receiver performance is degraded by various time and frequency impairments. In the PLC (Powerline Communication, power carrier communication) module communication system, due to the mismatch between the local crystal oscillator of the transmitter and the local crystal oscillator of the receiver, inter-subcarrier interference (ICI, Inter-Channel Interference) and symbol Inter-Symbol Interference (ISI, Inter-Symbol Interference), which leads to the decline of receiver performance, the increase of bit error rate, and the decrease of communication rate. In more serious cases, normal communication will be completely interrupted. [0003] For equipment used in the field, the crystal oscillator clock will gradua...

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Problems solved by technology

[0004] In the prior art, 1. The calculation of the clock deviation is pre-calibrated at the factory, so that during the use of the equipment, due to aging, the correction value of the clock deviation will become worse and worse

2. Calibrate by carrier signal data. When this method is used in the live network, when the channel is not ideal, due to the existence of noise and various interferences, the accuracy of the calibration will be relatively poor, and the calibration is not ideal. The clock deviation is inconsistent, there are positive and negative deviations, and occasionally there are modules with large deviations, which will form a chaotic situation

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