摘要
在多天线高斯信道最佳容量的基础上,推导出在Nakagami和Weibull衰落下,采用分集技术的最佳信道容量的数学表达式。数值模拟表明信道容量与衰落程度和分集的性能有关。对于相同的平均信噪比,两种衰落信道容量随衰落程度的增大而增大,衰落程度对Weibull衰落信道容量的影响较大。对于相同的衰落程度,在平均信噪比相同的情况下,采用选择性分集比未采用选择性分集得到信道的最佳容量大。并得到了采用切换合并分集技术Weibull衰落信道下的最佳切换门限。
The optimum channel capacity for using diversity technique in the Nakagami fading or Weibull fading channels has been derived based on the optimum capacity of multi-antenna Gaussian channel model. The numerical simulation results show that channel capacity will be affected by fading severity and diversity performance. For the same SNR, two kinds of fading channel capacity increase as the fading severity increases. Moreover, the fading severity affects the channel capacity more on the Weibull fading channel capacity than on Nakagami fading channel. For the same fading severity and the same SNR, the optimum capacity of the channel with selective diversity is higher than that without selective diversity. Optimized switch threshold is obtained in the Weibull fading channel by using switch stay combining technology.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
2008年第1期11-13,共3页
Journal of University of Electronic Science and Technology of China
基金
国家863计划项目(2002AA123032)
关键词
信道容量
分集技术
衰落程度
高斯信道
channel capacity
diversity technique
fading severity
Gauss channel
