Abstract：Cyclic shift permutation structure is an important part of partial parallel decoder for quasi-cyclic LDPC codes. When the information is exchanged, a connecting law of basic switch units in Reverse Banyan network is researched and proved. Then a nonblocking permutation structure based on presetting routing algorithm for cyclic shift is designed. Compared with Benes exchange structure and Reverse Banyan exchange structure, the novel structure increases the exchange speed for information cyclic shift and occupies less hardware resource and area. Finally, an output converting unit is designed, which is adaptable for all kinds of switch structures.
2009, Vol. 31 
