Low density parity check code transmission method and device
AssigneeChina Academy of Telecommunications Technology
InventorsXijin Mu, Jiaqing Wang, Baoming Bai, Shaohui Sun
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Abstract
A low density parity check code transmission method and device, for use in improving the anti-burst-error capability of a low density parity check code. The method provided by the present application comprises: an interleaver changes the sequence of bit streams of a low density parity check code according to a preset rule, and outputs to a modulator the low density parity check code the sequence of bit streams of which is changed; the modulator modulates the low density parity check code the sequence of bit streams of which is changed and then sends the modulated low density parity check code to a receive end by using a channel.
Claims16
A method for transmitting Low-Density Parity Check (LDPC) codes, the method comprising:
- changing, by an interleaver, a bit stream order of LDPC codes according to a preset rule, and outputting the LDPC codes in the changed bit stream order to a modulator;
- and
- modulating, by the modulator, the LDPC codes in the changed bit stream order, and then transmitting them to a receiver over a channel;
- wherein the changing, by the interleaver, the bit stream order of the LDPC codes according to the preset rule comprises:
- changing, by the interleaver, first bit positions of codewords of a first part of bits in the LDPC codes to preset bit positions, and changing second bit positions of codewords of a second part of the bits in the LDPC codes randomly, wherein the preset bit positions are bit positions agreed on in advance with the receiver;
- wherein the codewords of the first part of the bits comprise codewords of punched bits.
A method for transmitting Low-Density Parity Check (LDPC) codes, the method comprising:
- receiving, by a demodulator, LDPC codes over a channel, and demodulating the LDPC codes, wherein the LDPC codes are LDPC codes in a bit stream order changed by an interleaver according to a preset rule;
- and
- resuming, by a de-interleaver, the bit stream order of the demodulated LDPC codes according to the preset rule;
- wherein the resuming, by the de-interleaver, the bit stream order of the demodulated LDPC codes according to the preset rule comprises:
- resuming, by the de-interleaver, first bit positions of codewords of a first part of bits in the LDPC codes to preset bit positions, and resuming second bit positions of codewords of a second part of the bits in the LDPC codes randomly, wherein the preset bit positions are bit positions agreed on in advance with a receiver;
- wherein the codewords of the first part of the bits comprise codewords of punched bits.
An apparatus for transmitting Low-Density Parity Check (LDPC) codes, the apparatus comprising:
- an interleaver configured to change a bit stream order of LDPC codes according to a preset rule, and to output the LDPC codes in the changed bit stream order to a modulator;
- and
- the modulator configured to modulate the LDPC codes in the changed bit stream order, and then transmit them to a receiver over a channel;
- wherein the interleaver configured to change the bit stream order of the LDPC codes according to the preset rule is configured:
- to change first bit positions of codewords of a first part of bits in the LDPC codes to preset bit positions, and to change second bit positions of codewords of a second part of the bits in the LDPC codes randomly, wherein the preset bit positions are bit positions agreed on in advance with the receiver;
- wherein the codewords of the first part of the bits comprise codewords of punched bits.
An apparatus for transmitting Low-Density Parity Check (LDPC) codes, the apparatus comprising:
- a demodulator configured to receive the LDPC codes over a channel, and to demodulate the LDPC codes, wherein the LDPC codes are LDPC codes in a bit stream order changed by an interleaver according to a preset rule;
- and
- a de-interleaver configured to resume the bit stream order of the demodulated LDPC codes according to the preset rule;
- wherein the de-interleaver configured to resume the bit stream order of the demodulated LDPC codes according to the preset rule is configured:
- to resume first bit positions of codewords of a first part of bits in the LDPC codes to preset bit positions, and to resume second bit positions of codewords of a second part of the bits in the LDPC codes randomly, wherein the preset bit positions are bit positions agreed on in advance with a receiver;
- wherein the codewords of the first part of the bits comprise codewords of punched bits.
Dependencies are inferred from the claim text.