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Sociedade Brasileira de Telecomunicações

Estrategias de encurtamento em codigos LDPC

Four strategies for LDPC code shortening has been investigated in this work. A shortening strategy is characterized basically by the choice of positions in the information-word to place the known shortening bits. Our simulation results have shown that the right choice of the shortening strategy is an important issue. Of the examined strategies the one which place the known information bits in the beginning of the informationword yields the best performance. It is intuitive that placing the known information bits on those positions belonging to a short cycle yields a code with better performance — yet logical, the results obtained have not corroborated the intuitive conjecture

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