| 摘要 |
A method and an apparatus for encoding low density parity check codes in a communication system are provided to prevent a short-length cycle from occurring on a Tanner graph of a punctured LDPC(Low Density Parity Check) by designing an interleaver while considering a puncturing scheme. An encoder of an RA(Repeat Accumulate) coder includes a repeater(611), an interleaver(613), and an accumulator(615). Information bits of a length L is inputted to the repeater. The repeater repeats the information bits of the length L q times and outputs the result to the interleaver. The interleaver receives the output from the repeater, interleaves the received signal, and outputs the result to the accumulator. The accumulator accumulates the output signals from the interleaver to generate an RA code, and outputs the RA code.
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