Interference canceller and interference cancellation method

Abstract

An interference canceller and an interference cancellation method can generate a cancellation signal for reducing cross-port heterogeneous near-end crosstalk (XPAN) of a received signal of a receiver of a network device. The interference canceller includes: an oversampling circuit oversampling an XPAN transmit signal originating from a transmitter of the network device to generate an oversampled signal, the oversampled signal having a frequency higher than a receive frequency of the receiver; a frequency difference calculation circuit for calculating a frequency difference between the transmission frequency and the reception frequency of the transmitter; a sampling rate converter which is used for processing the oversampling signal according to the frequency difference so as to generate a conversion signal, wherein the frequency of the conversion signal is lower than that of the oversampling signal and is equal to that of the receiving frequency; and an XPAN canceller generating the cancellation signal according to the conversion signal and determining a coefficient of the XPAN canceller according to an error signal dependent on a difference between the XPAN of the received signal and the cancellation signal.

Description

technical field [0001] The present invention relates to an interference canceller and an interference canceling method, in particular to an interference canceller and an interference canceling method for a network device. Background technique [0002] The transmission signal of the transmitter of the network device will cause interference to the received signal of the receiver of the network device. In order to solve this problem, the applicant has proposed the invention of US Patent US9252994B2; : A circuit using Least Mean Square (LMS) technology) to track and compensate the phase shift (phase shift) between the elimination signal and the interference signal and the aliasing of the interference signal within a certain period of time, so the The elimination signal generation circuit may have poor performance when the timing difference between the transmitter and the receiver is large; in addition, when the network device enters the low-power consumption of the Energy-Effici...

AI Technical Summary

Problems solved by technology

[0002] The transmission signal of the transmitter of the network device will cause interference to the received signal of the receiver of the network device. In order to solve this problem, the applicant has proposed the invention of US Patent US9252994B2; : A circuit using Least Mean Square (LMS) technology) to track and compensate the phase shift (phase shift) between the elimination signal and the interference signal and the aliasing of the interference signal within a certain period of time, so the The elimination signal generation circuit may have poor performance when the timing difference between the transmitter and the receiver is large; in addition, when the network device enters the low-power consumption of the Energy-Efficient Ethernet (EEE) idle During the quiet state (Quiet State) of the (Low Power Idle) mode, the cancellation signal generation circuit may not be able to track the change of the phase offset, which makes the cancellation signal generation circuit unable to generate proper cancellation when leaving the quiet state. signal, and causes the receiver's signal-to-noise ratio to degrade

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