Method and system for decoding low density parity check (LDPC) codes
AssigneeDTVG Licensing, Inc.
InventorsMustafa Eroz, Feng-Wen Sun, Lin-Nan Lee
Life of this patent
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Abstract
An approach is provided for transmitting messages using low density parity check (LDPC) codes. Input messages are encoded according to a structured parity check matrix that imposes restrictions on a sub-matrix of the parity check matrix to generate LDPC codes. The LDPC codes are transmitted over a radio communication system (e.g., satellite network), wherein a receiver communicating over the radio communication system is configured to iteratively decode the received LDPC codes according to a signal constellation associated with the LDPC codes. The receiver is configured to iteratively regenerating signal constellation bit metrics after one or more decoding iterations.
Claims17
A method comprising:
- encoding information bits according to a low density parity check (LDPC) code;
- modulating the encoded information bits using a Gray-coded modulation scheme wherein more vulnerable bits of a signal constellation of the modulation scheme are assigned at least as many parity checks for the LDPC code as less vulnerable bits of the signal constellation such that the modulated encoded information are configured to be iteratively decoded by iteratively regenerating signal constellation bit metrics after one or more decoding iterations.
An apparatus comprising:
- logic configured to encode information bits according to a low density parity check (LDPC) code;
- a modulator configured to modulate the encoded information bits using a Gray-coded modulation scheme wherein more vulnerable bits of a signal constellation of the modulation scheme are assigned at least as many parity checks for the LDPC code as less vulnerable bits of the signal constellation such that the modulated encoded information are configured to be iteratively decoded by iteratively regenerating signal constellation bit metrics after one or more decoding iterations.
A transmitting system comprising:
- an encoder configured to encode information bits according to a low density parity check (LDPC) code;
- and
- a transceiver configured to modulate the encoded information bits using a Gray-coded modulation scheme wherein more vulnerable bits of a signal constellation of the modulation scheme are assigned at least as many parity checks for the LDPC code as less vulnerable bits of the signal constellation such that the modulated encoded information are configured to be to be iteratively decoded by iteratively regenerating signal constellation bit metrics after one or more decoding iterations.
Dependencies are inferred from the claim text.