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中文摘要：
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。
英文摘要：
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.
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