摘要
分集技术可有效提高无线通信系统抗衰落性能,通过将Nakagami衰落下的分集系统等效为单输入单输出系统,推导获得了选择合并(Selection combining,SC)、等增益合并(Equal gain combining,EGC)和最大比合并(Maximal ratio combining,MRC)3种方式下系统的输出信噪比和中断概率等性能表达式,并提出一种基于改进的Nakagami分集信道舍弃法模型用于数值仿真与验证。仿真结果表明,理论表达式结果与仿真值非常吻合,可用于辅助瑞利、莱斯和Nakagami等多种信道衰落下分集系统的参数选择、算法设计和性能评估。
Diversity combining is an effective technique to combat signal fading and improve the perform- ance of wireless communication system significantly. The diversity system over Nakagami fading chan- nels is equivalent as a single input and single output (SISO) system. Then, the expressions of system parameter such as signal-to-noise ratio (SNR) distribution and outage probability are derived for selec- tion combining (SC), equal gain combining (EGC) and maximal ratio combining (MRC) schemes under Nakagami fading channels. A modified Nakagami fading model based on rejection method is also presen- ted to numerical simulation and validation. Numerical simulation results show that the theoretical re- sults match the simulation results very well, which is helpful for parameter selection, algorithm design and performance evaluation of diversity system over various fading such as Rayleigh, Rice and Nakaga- mi.
出处
《南京航空航天大学学报》
EI
CAS
CSCD
北大核心
2013年第3期424-428,共5页
Journal of Nanjing University of Aeronautics & Astronautics
基金
航空科学基金(20120152001)资助项目
中央高校基本科研业务费专项资金(NS2012075
NZ2012012)资助项目
研究生学位论文创新与创优基金(DZS201103)资助项目
江苏高校优势学科建设工程资助项目