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Ingress cancellation is a method for removing narrowband noise from an electromagnetic signal using a digital filter. This type of filter is used on hybrid fiber-coaxial broadband networks.

If a carrier appears in the middle of the upstream data signal, ingress cancellation can remove the interfering carrier without causing packet loss.

Ingress cancellation also removes one or more carriers that are higher in amplitude than the data signal. Ingress cancellation eventually will break if the in-channel ingress gets too high.

References

1. Broadband Last Mile; Access Technologies for Multimedia Communications. CRC Press. 2018. pp. 290–299. ISBN 9781351836685.
2. Lusky, I.; Geri, N.; Reznic, Z.; Bitran, Y. (2002). "Adaptive algorithms for choosing transmission parameters in dynamic channel conditions" (PDF). 2002 14th International Conference on Digital Signal Processing Proceedings. 1. IEEE: 53–56.
3. Popper, A.; Buda, F.; Sari, H. (2002). "Ingress noise cancellation for the upstream channel in broadband cable access systems". 2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333). Vol. 3. IEEE. pp. 1808–1812. doi:10.1109/ICC.2002.997160. ISBN 0-7803-7400-2. S2CID 22576844.

See also

• Distortion
• Electromagnetic interference
• Ingress filtering
• Noise reduction

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