非对称协作分集通信中网络编码的应用  

The Application of Network Coding in Asymmetric Cooperative Diversity Communication

作　　者：池新生[1,2] 郑宝玉[1] 姚刚[1] 陈建白[1] 

机构地区：[1]南京邮电大学信号处理与传输研究院,南京210003 [2]宽带无线通信与传感网技术教育部重点实验室,南京210003

出　　处：《电子与信息学报》2012年第10期2314-2319,共6页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(60972039);江苏省自然科学基金重点项目(BK201007)资助课题

摘　　要：该文提出了网络编码在非对称三点协作传输系统中的应用。通过协作分集技术和网络编码技术的联合运用,不但可得到无线通信传输系统的分集增益,也可得到系统的编码增益。该文设计的方案,充分考虑无线通信环境的差异性,利用非对称调制方式,在保证较差通信环境中取得通信可靠性的同时,在较优链路采取较高速率进行传输,利用较优链路传输更多的信息,实现系统资源的充分利用。在方案的具体实现中,通过在中继链路的中继节点加入已知信息实现网络编码,使得系统的译码性能得到增加。仿真结果表明,将网络编码技术应用于非对称协作分集通信中,相对比非协作传输方案可增加分集增益,降低系统的误比特率。跟传统对称传输系统相比,可充分利用系统资源,提升了系统传输容量。This paper proposes a scheme of network coding for asymmetric data transmission in three-point cooperative communication system. Since the joint using both cooperative diversity and network coding, the diversity gain and coding gain are achieved in wireless communications transmission system. In this paper, the differences of wireless communication environment are fully considered. The scheme with asymmetric modulation ensures the reliability of communication in the poor environment. Meanwhile, it transmits more data in better links to make full use of system resource. The main idea to realize network coding of asymmetric data transmission is to add prior known information in the relay. The prior known information can enhance the coding performance of the system. Simulations show that the proposed transmission scheme can achieve the diversity gain and reduce the BER compared to non-cooperative transmission system. In addition, it can improve the transmission capacity of the communication system.

关 键 词：无线通信 网络编码 协作分集 非对称速率 信道差异 

分 类 号：TN925[电子电信—通信与信息系统]