LDPC DECODER FOR MOBILE WIMAX

摘要

PURPOSE: An LDPC(Low Density Parity Check) decoder for a mobile WI-MAX(Worldwide Interoperability for Microwave Access) is provided to reduce the number of clocks which decodes a single layer by eliminating an inserted stall. CONSTITUTION: An LDPC decoder(10) for a mobile Wi-Max includes a first memory(12) which stores a determination variable value and a second memory(11) which stores a check node value. The LDPC decoder includes a parity check matrix storage(131) which stores information about a basic parity check matrix supporting a code rate defined by IEEE(Institute of Electrical and Electronics Engineers) 802.16e standard. The LDPC decoder includes a cycle shift value generation unit(14) which generates a cycle shift value of a parity check matrix about a plurality of action modes according to a block length and a code rate. The LDPC decoder includes a substitution unit(15) which cyclically shifts data decoded according to the parity check matrix about a plurality of action modes. The LDPC decoder includes a decoding function unit(16) which performs decoding calculation.