System for impulse noise and radio frequency interference detection
AssigneeLantiq Deutschland GmbH
InventorsRaj Kumar Jain, Ravindra Singh, Hak Keong Sim
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Abstract
A system for processing a data signal (such as an ADSL or VDSL signal) includes a first decoder unit, such as a convolutional decoder or a QAM decoder, for receiving the data signal, decoding the second level of encoding and outputting a decoded signal and a first error indication signal indicative of errors in the decoded signal. A redundancy decoder employs the decoded signal and the first error indication signal (or transformed versions thereof) to perform redundancy decoding.
Claims38
A decoder that processes a data signal formed by encoding a first data string by redundancy encoding to form a first encoded signal, interleaving the first encoded signal to form an interleaved data string, performing a second level of encoding on the interleaved data string to form a second encoded signal, modulating a wave using the second encoded signal, and then transmitting the modulated wave over a data communication path, the decoder comprising:
- a demodulation unit operative to receive the modulated wave transmitted over the data communication path and to demodulate the modulated wave to form demodulated data;
- a first decoder unit operative to receive the demodulated data, to decode the second level of encoding and output a decoded signal and a first error indication signal indicative of a presence of errors in the decoded signal;
- a de-interleaver unit that operates on the decoded signal to form a de-interleaved signal;
- an identifier unit that receives the first error indication signal, and from the first error indication signal, produces a second error indication signal indicative of a presence of errors in the de-interleaved signal;
- a redundancy decoder operative to perform redundancy decoding using data derived from the first decoder unit, said redundancy decoder being arranged to operate on the de-interleaved signal and the second error indication signal.
A method of processing a data signal formed by encoding a first data string by redundancy encoding to form a first encoded signal, interleaving the first encoded signal to form an interleaved data string, performing a second level of encoding on the interleaved data string to form an encoded signal, modulating a wave using the encoded signal, and then transmitting the modulated wave over a data communication path, the method comprising:
- receiving the transmitted signal and demodulating it to form demodulated data;
- decoding the second level of encoding to form a decoded signal and a first error indication signal indicative of a presence of errors in the decoded signal;
- processing the decoded signal to form a de-interleaved signal, and producing from the first error indication signal a second error indication signal indicative of a presence of errors in the de-interleaved signal;
- and
- performing redundancy decoding on the de-interleaved signal and the second error indication signal, the redundancy decoding being performed according to the decoded signal and the first error indication signal.
An apparatus for processing a data signal formed by encoding a first data string by redundancy encoding to form a first encoded signal, interleaving the first encoded signal to form an interleaved data string, performing a second level of encoding on the interleaved data string to form an encoded signal, modulating a wave using the encoded signal, and then transmitting the modulated wave over a data communication path, the apparatus comprising:
- means for receiving the transmitted signal and demodulating it to form demodulated data;
- means for decoding the second level of encoding to form a decoded signal and wherein the means for decoding is configured to form a first error indication signal indicative of a presence of errors in the decoded signal;
- means for processing the decoded signal to form a de-interleaved signal;
- and
- means for performing redundancy decoding according to the decoded signal and the first error indication signal, said means for performing redundancy decoding configured to process the de-interleaved signal and the second error indication signal,
- wherein the means for decoding the second level of encoding is further configured to form a second error indication signal indicative of a presence of errors in the de-interleaved signal.
A decoder that processes a data signal including DMT symbols, the data signal formed by encoding a first data string by redundancy encoding to form a first encoded signal, performing a second level of encoding to form a second encoded signal, modulating a wave using the second encoded signal, and then transmitting the modulated wave over a data communication path, the decoder comprising:
- a demodulation unit operative to receive the modulated wave transmitted over the data communication path and to demodulate the modulated wave to form demodulated data;
- a first decoder unit operative to receive the demodulated data, to decode the second level of encoding and output a decoded signal and a first error indication signal indicative of a presence of errors in the decoded signal, the first decoder unit including a counter configured to measure a sum over multiple tones within a DMT symbol of a measure of a likelihood of corruption, and a comparator operative to determine when the counter is above a threshold;
- and
- a redundancy decoder operative to perform redundancy decoding using data derived from the first decoder unit.
A decoder that processes a data signal including DMT symbols, the data signal formed by encoding a first data string by redundancy encoding to form a first encoded signal, performing a second level of encoding to form a second encoded signal, modulating a wave using the second encoded signal, and then transmitting the modulated wave over a data communication path, the decoder comprising:
- a demodulation unit operative to receive the modulated wave transmitted over the data communication path and to demodulate the modulated wave to form demodulated data;
- a first decoder unit operative to receive the demodulated data, to decode the second level of encoding and output a decoded signal and a first error indication signal indicative of a presence of errors in the decoded signal, the first decoder unit including a counter configured to measure a sum over multiple symbols of a measure of a likelihood of corruption on a given tone, and a comparator operative to determine when the counter is above a threshold;
- and
- a redundancy decoder operative to perform redundancy decoding using data derived from the first decoder unit.
Dependencies are inferred from the claim text.