基于COFDM系统的自适应混合自动重传请求  

An adaptive HARQ scheme for COFDM system

作　　者：李鸿林[1] 王广佳[1] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001

出　　处：《应用科技》2010年第11期18-21,共4页Applied Science and Technology

摘　　要：针对比较恶劣的无线信道环境下低密度奇偶校验码与正交频分复用相结合的通信系统不能得到比较理想的误码率的问题,该文基于编码正交频分复用(COFDM)系统设计了一种自适应混合自动重传请求(HARQ)方案,它充分利用发送端获得的信道估计信息对每次重传的数据序列进行自适应交织来降低信道对同一比特的影响,从而降低接收端的误码率.仿真结果表明,自适应混合自动重传请求与编码正交频分复用相结合,无论是在高斯信道或是莱斯信道下都能很好地降低误码率.The system which is made up of LDPC （low density parity check） codes and OFDM （orthogonal frequency division multiplexing） cannot get an ideal BER （bit error ratio） when confronted with bad communication channel. So an adaptive HARQ （hybrid automatic repeat request） scheme was proposed based on the COFDM （coding orthogonal frequency division multiplexing） system. It can make full use of the channel state information, which is obtained by the transmitter, to adaptively interweave the repeatedly transmitted symbols to bring down the channel influence on the same bit, and thereby to bring down the BER of the receiver. Simulation results show that the proposed scheme can get an ideal BER through either Rician channel or Gaussian channel.

关 键 词：混合自动重传请求 正交频分复用 低密度奇偶校验码 自适应交织 

分 类 号：TN929.5[电子电信—通信与信息系统]