Turbo coding for upstream and downstream transmission in cable systems
AssigneeBroadcom Corporation
InventorsRavi Bhaskaran, Bruce J. Currivan, Thomas J. Kolze, Ba-Zhong Shen
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Abstract
A method of transmitting data in a cable modem system includes the steps of encoding the data using forward error correction. The data is then encoded with Turbo encoding. The data is then sent to a modulation scheme. The data is then transmitted over a cable channel. The data is then demodulated. The data is then decoded using a Turbo decoder. An inverse of the forward error correction is then applied to the data.
Claims33
A method of transmitting data in a cable modem system, comprising:
- encoding the data using an outer, forward error correction (FEC) scheme to generate a first portion of outer encoded data and a second portion of outer encoded data;
- encoding the first portion of outer encoded data using an inner encoding scheme to generate inner encoded data;
- mapping the second portion of outer encoded data and the inner encoded data to a modulation scheme to generate mapped data;
- and
- transmitting the mapped data over a cable channel.
A system for transmitting data in a cable modem system comprising:
- an outer, forward error correction (FEC) block configured to encode the data to generate a first portion of outer encoded data and a second portion of outer encoded data;
- an inner encoder configured to encode the first portion of outer encoded data to generate inner encoded data;
- a modulator that is configured to map the second portion of outer encoded data and the inner encoded data to a modulation scheme to generate mapped data;
- and
- a cable modem transmitter that is configured to transmit the mapped data over a cable channel.
A method of receiving data in a cable modem system, comprising:
- demodulating the received data to generate a first portion of demodulated data and a second portion of demodulated data;
- decoding the first portion of demodulated data, using an inner decoder, to generate inner decoded data;
- decoding the inner decoded data and the second portion of demodulated data using an outer, forward error correction (FEC) decoder.
A system for receiving data in a cable modem system comprising:
- a demodulator configured to demodulate the received data to generate a first portion of demodulated data and a second portion of demodulated data;
- an inner decoder configured to decode the first portion of demodulated data to generate inner decoded data;
- an outer, forward error correction (FEC) decoder configured to decode the inner decoded data and the second portion of demodulated data.
Dependencies are inferred from the claim text.