Low‐complexity, high‐speed multi‐size cyclic‐shifter for quasi‐cyclic LDPC decoder
H.‐J. Kang, Byung‐Do Yang · Electronics Letters · 2018
Quasi‐cyclic low‐density parity check (QC‐LDPC) codes are being widely used in communication standards, and the decoder of QC‐LDPC codes requires a unique type of rotator. The unique rotator, called a multi‐size cyclic‐shifter (MSCS), should be able to rotate data with various sizes, and many structures have been proposed for the operation. A low‐complexity, high‐speed MSCS structure is proposed, in which a part of the previous smallest structure is replaced with a structure with less delay and comparable area. The synthesis results present that the proposed structure achieves not only the highest speed but also the lowest complexity after synthesis.