摘要
针对功率约束为P的高斯信道,等概率均匀分布的输入信号可达到的传输速率始终与信道容量极限存在差距的问题。基于Box-Muller变换,提出一种利用等概率均匀分布信号构造振幅频移相键控(APSK)星座的方法(BM-APSK),并证明该方法在星座点数趋于无穷时达到高斯信道容量。通过高斯信道模拟卫星通信环境,采用无速率码编译码技术结合BM-APSK调制方法实验。实验结果表明:实际译码启动长度与由信道容量计算的启动译码时理论码字长度条件基本保持一致,研究信道容量对实际通信系统译码时初始启动码率有很好的估计效果。
Aiming at Gaussian channel with power constraint P. A gap exists between the channel capacity and the highest achievable rate of equiprobable uniformly spaced signal. Based on the Box-Muller transform,a method of constructing APSK constellation with equiprobable signaling( BM-APSK) that achieve the Gaussian capacity as the number of constellation points goes to infinity is proposed. The Gaussian channel is used to simulate the satellite communication environment,and the rate-free code coding and decoding technology is combined with the BM-APSK modulation. The experimental results show that the actual decoding start length is the same as the theoretical length condition when the decoding is calculated by the channel capacity,which indicates that the channel capacity have a good estimation of the initial starting code rate when the actual communication system is decoded.
作者
丁莹
肖本贤
DING Ying;XIAO Benxian(School of Electric Engineering and Automation,Hefei University of Technology,Hefei 230009,China)
出处
《传感器与微系统》
CSCD
2020年第4期114-117,共4页
Transducer and Microsystem Technologies
基金
国家自然科学基金资助项目(51577046)
国家自然科学基金重点资助项目(51637004)
国家重点研发计划“重大科学仪器设备开发”资助项目(2016YFF0102200)。
