Physical layer chip in eoc network and its realization method

Abstract

The invention discloses a physical layer chip in an EOC network, wherein a power spectrum module receives a useful signal after gain adjustment output by a frame detection and automatic gain control module, and calculates the power spectrum of the signal; a frequency scanning module receives a down-converted signal and the baseband signal of one symbol rate output by the interpolation module, the frequency scanning module up-converts and the interpolation module outputs the center frequency and symbol rate, and the down-conversion and interpolation module outputs the center frequency and symbol rate; the equalization and noise suppression module receives the next The frequency conversion conversion and interpolation module outputs a baseband signal of one symbol rate, and suppresses the echo and narrowband noise in the signal, and then outputs the equalized signal to the demodulator. The invention also discloses a realization method of the chip. The invention has the function of measuring network noise in real time and can effectively suppress intrusion noise.

Description

technical field [0001] The invention relates to a physical layer chip in an EOC (Ethernet Over Coax, Ethernet over coaxial cable) network and a realization method thereof. Background technique [0002] In the EOC network, a central office device is connected to multiple user end devices through a coaxial cable, and the central office device and the user end devices have the same physical layer chip. The physical layer chip works in a half-duplex state, with a sending state and a receiving state, and the working state is controlled by the MAC chip (the MAC layer is the upper layer of the physical layer). [0003] see figure 1 , the physical layer chips in the existing EOC network include: analog front end module (analogfront end), modulator (Modultor), up conversion and interpolation module (Up Conversion & Interpolator), frame detection and automatic gain control module (Frame Detected & automatic gaincontrol), down conversion and interpolation module (Down Conversion & In...

AI Technical Summary

Problems solved by technology

Since the existing equalizer and noise suppression modules do not calculate the initial value of the filter coefficients, they are only trained through training data or blindly trained, so the filter coefficients converge slowly and are difficult to use in practice, so the intrusion noise cannot be controlled. Effective processing, making the communication quality of EOC network easily affected by intrusion noise

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