航空航天通信技术一般采用模拟通信的频率调制和数字通信的移相键控调制方法。这有利于充分应用信道带宽和能源。频率调制是在一定程度上改变载波或副载波的频率来传输信息的调制方法。移相键控调制是利用载波或副载波的相位跳变来传输信息的调制方法。移相键控又分二相移相键控、四相移相键控和多相移相键控，其中以四相移相键控和八相移相键控调制方法的效率较高-Aerospace communications technology commonly used analog communication of frequen

A Source-Destination Network Coded Cooperation for Wireless Ad-hoc Networks Kaibin Zhang 1 , Liuguo Yin2, Jianhua Lu1,2 IDepartment of Electronic Engineering 2School of Aerospace Tsinghua University Beijing 100084, P.R.China E-mail: zhang