说明：  　深入研究了基于 IEEE 802. 16e 标准的 LDPC 编码的OFDM 无线通信系统. 分析了标准 中LDPC 码校验矩阵构造和相应的快速编码方法, 建立了 LDPC -COFDM 无线通信系统
(The OFDM wireless communication system based on LDPC coding of IEEE 802.16e standard is studied. The construction of LDPC code check matrix and the corresponding fast coding method are analyzed. The LDPC-COFDM wireless communication system is established)