协作通信技术在恶劣信道条件下的应用研究

为了在信道状况较差时仍能采用编码协作技术,提出了一种有效混合编码协作方法.以两用户为例,在两次发送时隙都采用QPSK调制,并采用LDPC码的混合自动重传(HARQ)方法,当第一时隙传输数据不能被正确译码时,源节点将重新传送数据,中继节点将接收到的数据联合上一次接收的数据进行联合译码.当数据重传后仍不能被正确译码时,中继节点将采用放大转发方式传输第二时隙的数据,此时转为放大转发模式进行协同通信,通过性能分析和仿真结果表明,当协作用户间信道状况较差时,与非协作和普通编码协作方式相比,所提的协作方法仍能获得一定的分集增益.

Application Research of Cooperation Communication in Inclement Channel Conditions

An efficient hybrid cooperation communication method which can be used in inclement channel conditions is proposed. For two users, the source node transmits the data using QPSK modulation over two frames. Based on HARQ, the source node will redeliver data to the relay node when the transmitted information is not decoded correctly. The information is combined decoded together with the last transmitted information by the relay node. The relay node switches to amplification forwarding mode when the retransmitted data is still not be decoded correctly. Analysis and simulation results show that the proposed cooperation method outperforms the no cooperation method and the conventional coded cooperation method in inclement channel conditions.