Upstream Burst Noise Detection
AssigneeBroadcom Corporation
InventorsYitshak OHANA, Avi KLIGER, Anatoli SHINDLER, Bazhong SHEN
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Abstract
The present disclosure is directed to a system and method for detecting burst noise. The system and method are described in the exemplary context of a cable modem system and can be used in such a system to specifically detect upstream burst noise. Once detected, the system and method can adjust the upstream receiver that receives data corrupted by the upstream burst noise to reduce the potentially deleterious effects that the burst noise can have on, for example, the packet error rate and/or data rate of the upstream receiver.
Claims20
An upstream receiver, comprising:
- a down-converter configured to down-convert a plurality of sub-carriers to provide a plurality of baseband signals;
- a plurality of soft-output demappers configured to demap symbols received over the plurality of baseband signals into a plurality of log-likelihood ratios (LLRs);
- a plurality of low-density parity-check (LDPC) decoders configured to decode a plurality of codewords based on the plurality of LLRs;
- and
- a burst noise detector configured to process ones of the plurality of baseband signals corresponding to nulled ones of the plurality of sub-carriers to detect burst noise and adjust one or more of the plurality of LLRs based on the burst noise.
An upstream receiver, comprising:
- a down-converter configured to down-convert a plurality of sub-carriers to provide a plurality of baseband signals;
- and
- a burst noise detector configured to process ones of the plurality of baseband signals corresponding to nulled ones of the plurality of sub-carriers to detect burst noise and adjust the upstream receiver based on the burst noise,
- wherein the burst noise detector is configured to control an upstream scheduler to prevent data from being transmitted upstream over the nulled ones of the plurality of sub-carriers.
A method, comprising:
- down-converting a plurality of sub-carriers received by an upstream receiver to provide a plurality of baseband signals;
- determining nulled ones of the plurality of sub-carriers;
- processing ones of the plurality of baseband signals corresponding to the nulled ones of the plurality of sub-carriers to detect a burst noise;
- and
- adjusting the upstream receiver based on the burst noise.
Dependencies are inferred from the claim text.