PSK-based Asymmetric Physical Layer Network Coding

In asymmetric two-way relay transmission with network coding,the traditional bit-level XOR-based scheme couldn't achieve the best performance.The inefficiency of traditional zero-padding XOR is caused by the lack of design freedom,and this could be proved with a simple example.A PSK-based network coding scheme,in combination with a decode-before-demodulate scheme,could achieve good performance.Moreover,this scheme could greatly simplify the design of asymmetric physical layer network coding,and be applied to channel coded systems in limited expense.