Comparison of IEEE802.16e and IEEE802.11n in QPSK with LDPC Minimum Sum Algorithm

摘要

In accordance with the approximate lower triangular parity check matrix standard of low-density parity-check codes in IEEE Standard 802.16e, this study used LabVIEW to write a variety of adjustable encoding patterns generated at the transmitter end within a single-program structure, including six groups of parity check matrices that were created using the four coding rates in 802.16e, and 114 codewords that were formed by developing 19 types of subblock sizes. A decoder with a minimum sum algorithm was employed to examine the structures of nodes and variable nodes based on changes in the selected standards and complete decoding. This paper describes an encoder-decoder mechanism for combining low-density parity-check codes and minimum sum algorithms, and a quadrature phase-shift keying-channel that was developed and applied to the encoder-decoder mechanism to analyze the resulting bit error rate (BER) curves. The BER curve analyses in 802.16e and 802.11n have revealed that the effect of subblock size on the BER was insignificant, and the two standards exhibited the most similar BERs at the code rates of 5/6 and 2/3; however, the error correction achieved by 802.11n at the code rate of 1/2 was the most effective.