Wi-Fi LDPC encoder with approximate lower triangular diverse implementation and verification

This study referenced the approximate lower triangular code check matrix in the low density parity check code of IEEE P802.11n™/D1.04 (Part 11: Wireless LAN Medium Access Control). The matrix was written in the LabVIEW programming language. Using a unified program architecture, yielded three subblock sizes (27, 54, and 81 bits) and four code rates (1/2, 2/3, 3/4, 5/6). Redundancy bits were calculated to generate 12 distinct codewords as stipulated by the 802.11n wireless standard. A mask matrix design was adopted to distinguish the “0” and spaces in the code check matrix. Finally the code check matrix was multiplied using transposed codewords to verify the accuracy of the codes.