To improve the detection accuracy of the balise uplink signal transmitted in a strong noise environment,we use chaotic oscillator to detect the balise uplink signal based on the characteristics of the chaotic system t...To improve the detection accuracy of the balise uplink signal transmitted in a strong noise environment,we use chaotic oscillator to detect the balise uplink signal based on the characteristics of the chaotic system that is sensitive to initial conditions and immune to noise.Combining with the principle of Duffing oscillator system used in weak signal detection and uplink signal feature,the methods and steps of using Duffing oscillator to detect the balise signal are presented.Furthermore,the Lyapunov exponent algorithm is used to calculate the critical threshold of the Duffing oscillator detection system.Thus,the output states of the system can be quantitatively judged to achieve demodulation of the balise signal.The simulation results show that the chaotic oscillator detection method for balise signal based on Lyapunov exponent algorithm not only improves the accuracy and efficiency of threshold setting,but also ensures the reliability of balise signal detection.展开更多
为解决第五代移动通信(5th generation mobile system,5G)场景下的极化码编码设计问题,通过对两种符合5G保准规定的控制上下行信道最大编码长度的极化码进行MATLAB仿真测试,通过对多种编码方式的平均编码时间进行比较,得到了最佳的极化...为解决第五代移动通信(5th generation mobile system,5G)场景下的极化码编码设计问题,通过对两种符合5G保准规定的控制上下行信道最大编码长度的极化码进行MATLAB仿真测试,通过对多种编码方式的平均编码时间进行比较,得到了最佳的极化码编码方式。结果表明:对于上下行信道来说,在码元长度一定的情况下,不实施比特反转的生成矩阵的编码方法的用时最短编码效率最高、用时最短。展开更多
基金National Natural Science Foundation of China(No.61763025)。
文摘To improve the detection accuracy of the balise uplink signal transmitted in a strong noise environment,we use chaotic oscillator to detect the balise uplink signal based on the characteristics of the chaotic system that is sensitive to initial conditions and immune to noise.Combining with the principle of Duffing oscillator system used in weak signal detection and uplink signal feature,the methods and steps of using Duffing oscillator to detect the balise signal are presented.Furthermore,the Lyapunov exponent algorithm is used to calculate the critical threshold of the Duffing oscillator detection system.Thus,the output states of the system can be quantitatively judged to achieve demodulation of the balise signal.The simulation results show that the chaotic oscillator detection method for balise signal based on Lyapunov exponent algorithm not only improves the accuracy and efficiency of threshold setting,but also ensures the reliability of balise signal detection.
文摘为解决第五代移动通信(5th generation mobile system,5G)场景下的极化码编码设计问题,通过对两种符合5G保准规定的控制上下行信道最大编码长度的极化码进行MATLAB仿真测试,通过对多种编码方式的平均编码时间进行比较,得到了最佳的极化码编码方式。结果表明:对于上下行信道来说,在码元长度一定的情况下,不实施比特反转的生成矩阵的编码方法的用时最短编码效率最高、用时最短。
