Abstract：The shortened LDPC codes based on the current IEEE802.16e Standard, has plenty of small girth. In order to resolve this problem, this paper presents a new scheme of designing the shortened LDPC codes. In the proposed scheme, the design has modified the sub-parity check matrix under the frame of the IEEE802.16e Standard. The proposed check matrix with the spreading factor (zf=48) is constructed with quasi-cyclic matrix method and finite geometry method. Moreover, parity check points was searched the node degree in the way of synchronous sequential, the proposed sub- parity check matrix has minor girth-6 and no girth-4. The results of simulation in the AWGN channels show that the improved short code with the code rate approaching to 0.5, can fast encode as excellent as the IEEE802.16e protocol contains，moreover, a good BER performance of the proposed code is 1.1dB more than the Shannon limit of this channel.
崔媛媛 徐荣青 潘欣艳 王玉杰 关丽 王斌斌. 基于IEEE802.16e协议的无短环的LDPC缩短码设计[J]. 计算机应用, 2011, 31(12): 3207-3209.
CUI Yuan-yuan XU Rong-qing PAN Xin-yan WANG Yu-jie GUAN Li WANG Bin-bin. Design of shortened LDPC codes based on IEEE802.16e protocol without short cycles. Journal of Computer Applications, 2011, 31(12): 3207-3209.
2011, Vol. 31 
