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在非对称的双向中继传输中,传统的基于比特异或的网络编码方案并不能取得最好的性能。一个简单的例子就可以说明传统的补零异或方案的缺陷,而导致这种缺陷的原因是设计自由度的缺乏。一种基于PSK的网络编码方案,配合解调前解码的方案,能够取得良好的性能,并且大大的简化非对称物理层网络编码方案的设计。而且这种方案能够方便的被用于有信道编码的系统,仅仅给系统带来少量的额外负担。
In asymmetric two-way relay transmission, the traditional XOR-based network coding scheme does not achieve the best performance. A simple example can illustrate the shortcomings of the traditional zero-substitution XOR solution, and the reason for this defect is the lack of freedom of design. A PSK-based network coding scheme, with the scheme of pre-demodulation decoding, can achieve good performance and greatly simplify the design of the asymmetric physical layer network coding scheme. And this kind of scheme can be conveniently used in the system having the channel code, only bring a little additional load to the system.