Impulse and/or burst noise signal to noise ratio (SNR) aware concatenated forward error correction (FEC)
View Patent ↗Impulse and/or burst noise signal to noise ratio (SNR) aware concatenated forward error correction (FEC). Adaptive processing is performed on a signal based on one or more effects which may deleteriously modify a signal. For example, based on a modification of a signal to noise ratio (SNR) associated with one or more impulse or burst noise events, which may be estimated, different respective processing may be performed selectively to differently affected bits associated with the signal. For example, two respective SNRs may be employed: a first SNR for one or more first bits, and a second SNR for one or more second bits. For example, as an impulse or burst noise event may affect different respective bits of a codeword differently, and adaptive processing may be made such that different respective bits of the codeword may be handled differently.
1. A communication device comprising:
a processor configured to:
receive a signal from another communication device via a communication channel;
process the signal to generate a plurality of bits;
process the bits to identity at least one bit of the plurality of bits that is affected by at least one of an impulse noise event or a burst noise event and at least one other bit of the plurality of bits that is unaffected by the at least one of the impulse noise event or the burst noise event; and
decode the signal to generate an estimate of an information bit encoded therein including to:
decode the at least one bit of the plurality of bits based on a first signal to noise ratio (SNR), wherein the first SNR is associated with the at least one of the impulse noise event or the burst noise event; and
decode the at least one other bit of the plurality of bits based on a second SNR that is different than the first SNR.
2. The communication device of claim 1 , wherein the processor is further configured to:
process the signal to generate the plurality of bits including to extract a first bit that is inner coded and a second bit that is not inner coded; and
decode the signal to generate the estimate of the information bit encoded therein including to:
inner code decode the first bit to generate a decoded first bit that is combined with the second bit to generate an inner decoded signal; and
outer code decode the inner decoded signal to generate a hard decision associated with at least one of the first bit or the second bit.
3. The communication device of claim 1 , wherein the processor is further configured to:
process the signal to generate the plurality of bits including to extract a first bit that is inner coded and a second bit that is not inner coded; and
decode the signal to generate the estimate of the information bit encoded therein including to:
inner code decode the first bit to generate a decoded first bit that is combined with the second bit to generate an inner decoded signal;
de-interleave the inner decoded signal to generate a de-interleaved inner decoded signal; and
outer code decode the de-interleaved inner decoded signal to generate a hard decision associated with at least one of the first bit or the second bit.
4. The communication device of claim 1 , wherein the processor is further configured to:
decode the signal to generate the estimate of the information bit encoded therein including to:
calculate a first log-likelihood ratio (LLR) associated with the at least one bit of the plurality of bits based on the first SNR; and
calculate a second LLR associated with the at least one other bit of the plurality of bits based on the second SNR that is different than the first SNR.
5. The communication device of claim 1 , wherein the signal is based on at least one of orthogonal frequency division multiplexing (OFDM), code division multiple access (CDMA), or synchronous code division multiple access (S-CDMA) signaling.
6. The communication device of claim 1 , wherein the processor is further configured to:
decode the signal to generate the estimate of the information bit encoded therein using at least one of low density parity check (LDPC) coding, turbo coding, BCH (Bose and Ray-Chaudhuri, and Hocquenghem) coding, Reed-Solomon (RS) coding, convolutional coding, or turbo trellis coded modulation (TTCM) coding.
7. The communication device of claim 1 further comprising:
a cable modem, wherein the another communication device is a cable headend transmitter or a cable modem termination system (CMTS).
8. The communication device of claim 1 , wherein the processor is further configured to:
support communications within at least one of a satellite communication system, a wireless communication system, a wired communication system, a fiber-optic communication system, or a mobile communication system.
9. A communication device comprising:
a processor configured to:
receive a signal from another communication device via a communication channel;
process the signal to generate a plurality of bits;
process the bits to identity at least one bit of the plurality of bits that is affected by at least one of an impulse noise event or a burst noise event and at least one other bit of the plurality of bits that is unaffected by the at least one of the impulse noise event or the burst noise event; and
decode the signal to generate an estimate of an information bit encoded therein including to:
calculate a first log-likelihood ratio (LLR) associated with the at least one bit of the plurality of bits based on a first signal to noise ratio (SNR);
decode the at least one bit of the plurality of bits using the first LLR;
calculate a second LLR associated with the at least one other bit of the plurality of bits based on a second SNR that is different than the first SNR; and
decode the at least one other bit of the plurality of bits using the second LLR.
10. The communication device of claim 9 , wherein the processor is further configured to:
process the signal to generate the plurality of bits including to extract a first bit that is inner coded and a second bit that is not inner coded; and
decode the signal to generate the estimate of the information bit encoded therein including to:
inner code decode the first bit to generate a decoded first bit that is combined with the second bit to generate an inner decoded signal; and
outer code decode the inner decoded signal to generate a hard decision associated with at least one of the first bit or the second bit.
11. The communication device of claim 9 , wherein the processor is further configured to:
decode the signal to generate the estimate of the information bit encoded therein using at least one of low density parity check (LDPC) coding, turbo coding, BCH (Bose and Ray-Chaudhuri, and Hocquenghem) coding, Reed-Solomon (RS) coding, convolutional coding, or turbo trellis coded modulation (TTCM) coding.
12. The communication device of claim 9 further comprising:
a cable modem, wherein the another communication device is a cable headend transmitter or a cable modem termination system (CMTS).
13. The communication device of claim 9 , wherein the processor is further configured to:
support communications within at least one of a satellite communication system, a wireless communication system, a wired communication system, a fiber-optic communication system, or a mobile communication system.
14. A method for execution by a communication device, the method comprising:
receiving, via a communication interface of the communication device, a signal from another communication device via a communication channel;
processing the signal to generate a plurality of bits;
processing the bits to identity at least one bit of the plurality of bits that is affected by at least one of an impulse noise event or a burst noise event and at least one other bit of the plurality of bits that is unaffected by the at least one of the impulse noise event or the burst noise event; and
decoding the signal to generate an estimate of an information bit encoded therein including:
decoding the at least one bit of the plurality of bits based on a first signal to noise ratio (SNR), wherein the first SNR is associated with the at least one of the impulse noise event or the burst noise event; and
decoding the at least one other bit of the plurality of bits based on a second SNR that is different than the first SNR.
15. The method of claim 14 further comprising:
processing the signal to generate the plurality of bits including to extract a first bit that is inner coded and a second bit that is not inner coded; and
decoding the signal to generate the estimate of the information bit encoded therein including:
inner code decoding the first bit to generate a decoded first bit that is combined with the second bit to generate an inner decoded signal; and
outer code decoding the inner decoded signal to generate a hard decision associated with at least one of the first bit or the second bit.
16. The method of claim 14 further comprising:
decoding the signal to generate the estimate of the information bit encoded therein including:
calculating a first log-likelihood ratio (LLR) associated with the at least one bit of the plurality of bits based on the first SNR; and
calculating a second LLR associated with the at least one other bit of the plurality of bits based on the second SNR that is different than the first SNR.
17. The method of claim 14 , wherein the signal is based on at least one of orthogonal frequency division multiplexing (OFDM), code division multiple access (CDMA), or synchronous code division multiple access (S-CDMA) signaling.
18. The method of claim 14 further comprising:
decoding the signal to generate the estimate of the information bit encoded therein using at least one of low density parity check (LDPC) coding, turbo coding, BCH (Bose and Ray-Chaudhuri, and Hocquenghem) coding, Reed-Solomon (RS) coding, convolutional coding, or turbo trellis coded modulation (TTCM) coding.
19. The method of claim 14 , wherein the communication device is a cable modem, and the another communication device is a cable headend transmitter or a cable modem termination system (CMTS).
20. The method of claim 14 further comprising:
operating the communication interface of the communication device to support communications within at least one of a satellite communication system, a wireless communication system, a wired communication system, a fiber-optic communication system, or a mobile communication system.