| 摘要 |
<p>In one embodiment, the present patent application comprises a method and apparatus to generate low rate protographs from high rate protographs, comprising copying a base graph; permuting end points of edges of a same type in copies of the base graph to produce a permuted graph; and pruning systematic input nodes in the permuted graph and the edges connected to them. In another embodiment, the present patent application comprises a method and apparatus to generate high- rate codes from low- rate codes, comprising puncturing a subset of codeword bits, wherein the step of puncturing a subset of codeword bits comprises regular-irregular puncturing where the puncturing pattern will be as regular as possible with respect to the preceding code, random puncturing, or progressive node puncturing to obtain a desired code from a preceding code.</p> |
