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中文摘要：
本文提出了基于非对称速率的双向中继信道的物理层网络编码方案。本文所提方案联系实际无线通信信道的差异性,不但考虑了较差链路的最大传输性能以保证其传输的可靠性,而且在较优链路采取较高速率进行传输,从而充分利用较优链路来传输更多信息,增加通信系统的信道容量。为实现不对称速率传输,其基本思想是在较差链路中加入已知信息,通过已知信息可减小中继节点接收到的叠加信号的星座图,使得通信系统的译码性能得到提升。在中继节点,根据叠加信号的星座图对叠加信号进行联合解调,在节省了系统工作时隙的同时也减小了系统的复杂度。仿真结果表明了采用非对称速率传输不但可保证信息传输的可靠性,还可提高通信系统的信道容量,充分利用系统资源。
英文摘要：
In this paper we proposed a scheme for asymmetric data transmission in Two-way Relaying Systems with physical layer network coding（PLNC）.As we all known,the wireless links are discrepant.The sources nodes transmit message with asymmetric rates according to their individual link qualities by employing network coding at the relay.The scheme with asymmetric data transmission not only make full use of the better link to transmit more data,but also considerate the reliability in the worse link.The main idea to realize asymmetric data transmission is to add prior known information so as to diminish the constellation of the superimposed signal received in the relay and to get better performance of system in demodulation and decoding.The relay node joint demodulate the superimposed signal according to the constellation.Therefore,it can reduce the complexity of the communication system.Simulations show that the proposed transmission scheme can guarantee the reliability.In addition,it can improve the channel capacity of the system and take full advantage of the system resources.
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