摘要
为通过高阶调制信号增加卫星信道的容量,在给出幅度相移键控(APSK)信号特征的基础上,根据最小欧氏距离最大化和平均互信息最大的原则对APSK星座进行优化。给出了APSK最小欧氏距离和不同星座普遍适用的信道容量计算方法。仿真结果表明,最小欧氏距离和信道容量仅与相对半径有关而与相对相位无关。信噪比相同时不同APSK星座的信道容量差别很小,卫星信道中星座的优化可考虑功率利用率为主。
To increase the capacity of satellite channel by high order modulation signal, the optimal design method for amplitude phase shift keying （APSK） constellation was put forward according to the rules of maximum minimum Euclidean distance and maximum average mutual information based on the characteristics given of APSK signal in this paper. The calculation equations for maximum minimum Euclidean distance of APSK and channel capacity that was suitable for various constellations were presented, The simulation results showed that the minimum Euclidean distance and channel capacity were dependent on relative radii and were independent of relative phase. The channel capacities of various APSK constellations with the same signal-to-noise ratio were very similar. The majority of the constellation optimization would be focused on their power efficiency.
出处
《上海航天》
北大核心
2006年第5期33-37,共5页
Aerospace Shanghai
关键词
卫星信道
幅度相移键控
星座
最小欧氏距离
平均互信息
信道容量
相对半径
相对相位
Satellite channel
Amplitude phase shift keying
Constellation
Minimum Euclidean distance
Average mutual information
Channel capacity
Relative radii
Relative phase
