The two dimensional quantum dipole springs in background uniform electric and magnetic fields are first studied in the conventional commutative coordinate space, leading to rigorous results. Then, the model is studied...The two dimensional quantum dipole springs in background uniform electric and magnetic fields are first studied in the conventional commutative coordinate space, leading to rigorous results. Then, the model is studied in the framework of the noncommutative (NC) phase space. The NC Hamiltonian and angular momentum do not commute any more in this space. By the means of the su(1,1) symmetry and the similarity transformation, exact solutions are obtained for both the NC angular momentum and the NC Hamiltonian.展开更多
针对以感知波形为基础的信号在通感一体化(Integrated sensing and communication,ISAC)系统中面临通信速率低、易被截获等问题,本文设计了一种基于正交相移键控(Quadrature phase shift keying,QPSK)与线性调频信号(Linear frequency m...针对以感知波形为基础的信号在通感一体化(Integrated sensing and communication,ISAC)系统中面临通信速率低、易被截获等问题,本文设计了一种基于正交相移键控(Quadrature phase shift keying,QPSK)与线性调频信号(Linear frequency modulation,LFM)的多路跳频传输架构。该架构利用多个LFM信号同时在重叠的频谱区间传输以提高符号速率,并通过LFM子载波的跳频特性实现加密通信。此外,通过结合动态前导码与数据的时分复用机制,该方案有效地提升了多路LFM信号的路径索引和参数估计精度。针对符号解调,本文提出两种基于非相干离散啁啾傅里叶变换(Noncoherent discrete chirp Fourier transform,NC⁃DCFT)的多峰值检测算法。仿真结果表明,在相同符号速率约束下,本文所提出的多路并行架构在误码率方面优于传统单路方案,当信噪比为0 dB时,4路并行架构的误码率相较于单路方案降低了一个数量级。同时,动态前导码方案满足不同场景下的路径索引识别需求,在信噪比为0 dB时,归一化均方差均低于10-2。此外,面向功率均衡、功率差异显著及载波参数保护间隔较小3种复杂场景设计的符号检测算法,在其适配场景下均可实现误码率低于10-2。最后,跳频机制显著增强了系统的抗截获能力,即使50%参数泄露,第3方对信号的恢复概率(Probability of accurate recovery,PAR)仍被压制在7%以下,验证了该方案的鲁棒性与应用价值。展开更多
文摘The two dimensional quantum dipole springs in background uniform electric and magnetic fields are first studied in the conventional commutative coordinate space, leading to rigorous results. Then, the model is studied in the framework of the noncommutative (NC) phase space. The NC Hamiltonian and angular momentum do not commute any more in this space. By the means of the su(1,1) symmetry and the similarity transformation, exact solutions are obtained for both the NC angular momentum and the NC Hamiltonian.
文摘针对以感知波形为基础的信号在通感一体化(Integrated sensing and communication,ISAC)系统中面临通信速率低、易被截获等问题,本文设计了一种基于正交相移键控(Quadrature phase shift keying,QPSK)与线性调频信号(Linear frequency modulation,LFM)的多路跳频传输架构。该架构利用多个LFM信号同时在重叠的频谱区间传输以提高符号速率,并通过LFM子载波的跳频特性实现加密通信。此外,通过结合动态前导码与数据的时分复用机制,该方案有效地提升了多路LFM信号的路径索引和参数估计精度。针对符号解调,本文提出两种基于非相干离散啁啾傅里叶变换(Noncoherent discrete chirp Fourier transform,NC⁃DCFT)的多峰值检测算法。仿真结果表明,在相同符号速率约束下,本文所提出的多路并行架构在误码率方面优于传统单路方案,当信噪比为0 dB时,4路并行架构的误码率相较于单路方案降低了一个数量级。同时,动态前导码方案满足不同场景下的路径索引识别需求,在信噪比为0 dB时,归一化均方差均低于10-2。此外,面向功率均衡、功率差异显著及载波参数保护间隔较小3种复杂场景设计的符号检测算法,在其适配场景下均可实现误码率低于10-2。最后,跳频机制显著增强了系统的抗截获能力,即使50%参数泄露,第3方对信号的恢复概率(Probability of accurate recovery,PAR)仍被压制在7%以下,验证了该方案的鲁棒性与应用价值。
