无线网络中物理层网络编码策略研究

Study on Physical-layer Network Coding Strategy in Wireless Network

无线网络通信中的电磁波在传输过程中会互相干扰,物理层网络编码通过一种恰当的调制解调技术来降低节点间通信的相互影响。但常见的物理层调制技术相移键控PSK因存在"倒π现象"及连"0"连"1"问题,会导致接收差错。为此,提出一种基于差分相移键控调制技术的物理层网络编码(PNC-DPSK)方案,并将其推广至多进制的差分相移键控(MDPSK),该方案解决了PSK存在的问题,并在中继节点节省约50%的能量。

The electromagnetic wave will interfere with each other in the process of transmission in wireless network communications. Physical-layer Network Coding（PNC） reduces the communication interaction between nodes through a proper modulation-and-demodulation technique. PSK is a common physical layer modulation technique, but PSK has phase ambiguity and continuous ＂0＂ continuous ＂l＂ problem, and cause receive error. A scheme differential phase-shift keying based on PNC-DPSK is proposed, and it is also extended to M-ary differential phase-shift keying. The novel scheme is a solution method to PSK＇s phase ambiguity and continuous ＂0＂ continuous ＂1＂ problem, and it also can reduce about 50% energy consumption in the relay node.