摘要
幅相键控(APSK)调制作为一种QAM与PSK调制的结合方法,既减小了对放大器非线性的敏感性,又提高频谱利用率,已经在宽带卫星通信中得到广泛关注。介绍APSK调制的信号特性,重点分析16APSK的星座图优化问题,并提出一种新的搜索最小欧氏距离的方法。针对卫星信道中的非线性问题,进行了预失真矫正。仿真结果充分表明,经过预失真补偿后的APSK调制在卫星信道中具有优越性。
As a combination of QAM and PSK,the Amplitude Phase Shift Keying(APSK)modulation reduces the sensitivity to non-linear element while enhances the bandwidth efficiency.In this paper,the signal characteristic of APSK modulation is analyzed,especially the optimal design of APSK signal constellation.Then a new method to search the minimum Euclidean distance is proposed.In the satellite channel,we make a pre-distortion.The simulation results show that the APSK modulation has a superior performance in the satellite communication.
出处
《遥测遥控》
2009年第6期10-14,共5页
Journal of Telemetry,Tracking and Command
关键词
APSK调制
星座图
最小欧氏距离
预失真补偿
卫星通信
APSK modulation
Constellation
Minimum Euclidean distance
Pre-distortion
Satellite communication
