针对非合作条件下Mult-i h连续相位调制(CPM)信号符号速率的盲估计问题,提出了一种新颖的预滤波二次谱算法,通过对接收信号滤波然后搜索其二次谱的峰值实现Mult-i h CPM信号符号速率的估计,并利用CPM信号的PAM展开表达式解释了算法的原...针对非合作条件下Mult-i h连续相位调制(CPM)信号符号速率的盲估计问题,提出了一种新颖的预滤波二次谱算法,通过对接收信号滤波然后搜索其二次谱的峰值实现Mult-i h CPM信号符号速率的估计,并利用CPM信号的PAM展开表达式解释了算法的原理。仿真实验结果表明,该算法是无偏的,与基于循环谱分析的算法相比具有运算量小的优点,并且适用于各种类型的Mult-i h CPM信号,同时不需要载波频率和调制指数的先验信息,具有很强的鲁棒性。展开更多
The minimum squared Euclidean distance(MSED) of binary multi-h phase codes is presented. The signal segregation degree(SSD) has been put forward to determine MSED of multi-h phase codes. In order to maximize MSED, SSD...The minimum squared Euclidean distance(MSED) of binary multi-h phase codes is presented. The signal segregation degree(SSD) has been put forward to determine MSED of multi-h phase codes. In order to maximize MSED, SSD should be as large as possible. The necessary and sufficient conditions of maximizing SSD are derived. Finally, SSD and the exact formulae for MSED of binary 2-h phase codes are also presented.展开更多
In order to solve the problem of high computational complexity in demodulation for multi-h continuous phase modulation(CPM) signal, a maximum cumulative measure combing with the Laurent decomposition(MCM-LD) scheme is...In order to solve the problem of high computational complexity in demodulation for multi-h continuous phase modulation(CPM) signal, a maximum cumulative measure combing with the Laurent decomposition(MCM-LD) scheme is proposed to reduce the number of the grid states and the required number of matched filters, which degrades the demodulation complexity at the receiver.The advanced range telemetry(ARTM) Tier Ⅱ CPM signal is adopted to evaluate the performance in simulation. The results show that, compared with the traditional maximum likelihood sequence detection(MLSD), MCM-LD can respectively reduce the numbers of grid states and matched filters from 256 to 32 and 128 to 48 with negligible performance loss, which effectively degrades the computational complexity for multi-h CPM signal.展开更多
针对多指数连续相位调制信号提出基于序列检测的早迟环定时同步,利用维特比算法的幸存度量构造定时误差估计器。根据误差估计的S曲线和方差,优化定时误差捕获范围和估计精度、消除环路假锁点,同时利用多指数连续相位调制的脉冲幅度调制...针对多指数连续相位调制信号提出基于序列检测的早迟环定时同步,利用维特比算法的幸存度量构造定时误差估计器。根据误差估计的S曲线和方差,优化定时误差捕获范围和估计精度、消除环路假锁点,同时利用多指数连续相位调制的脉冲幅度调制分解对定时误差估计器进行简化。仿真结果表明,优化后的早迟环定时误差捕获范围最大可达±0.5个符号周期,估计精度在中低信噪比下能够接近修正的克拉美罗界,在高信噪比下也有较好的估计性能;当早迟环定时支路的分支度量简化至最大似然序列检测的1/8时,对多进制、部分响应的多指数连续相位调制信号,造成的解调性能损失小于0.5 d B。展开更多
文摘针对非合作条件下Mult-i h连续相位调制(CPM)信号符号速率的盲估计问题,提出了一种新颖的预滤波二次谱算法,通过对接收信号滤波然后搜索其二次谱的峰值实现Mult-i h CPM信号符号速率的估计,并利用CPM信号的PAM展开表达式解释了算法的原理。仿真实验结果表明,该算法是无偏的,与基于循环谱分析的算法相比具有运算量小的优点,并且适用于各种类型的Mult-i h CPM信号,同时不需要载波频率和调制指数的先验信息,具有很强的鲁棒性。
文摘The minimum squared Euclidean distance(MSED) of binary multi-h phase codes is presented. The signal segregation degree(SSD) has been put forward to determine MSED of multi-h phase codes. In order to maximize MSED, SSD should be as large as possible. The necessary and sufficient conditions of maximizing SSD are derived. Finally, SSD and the exact formulae for MSED of binary 2-h phase codes are also presented.
文摘In order to solve the problem of high computational complexity in demodulation for multi-h continuous phase modulation(CPM) signal, a maximum cumulative measure combing with the Laurent decomposition(MCM-LD) scheme is proposed to reduce the number of the grid states and the required number of matched filters, which degrades the demodulation complexity at the receiver.The advanced range telemetry(ARTM) Tier Ⅱ CPM signal is adopted to evaluate the performance in simulation. The results show that, compared with the traditional maximum likelihood sequence detection(MLSD), MCM-LD can respectively reduce the numbers of grid states and matched filters from 256 to 32 and 128 to 48 with negligible performance loss, which effectively degrades the computational complexity for multi-h CPM signal.
文摘针对多指数连续相位调制信号提出基于序列检测的早迟环定时同步,利用维特比算法的幸存度量构造定时误差估计器。根据误差估计的S曲线和方差,优化定时误差捕获范围和估计精度、消除环路假锁点,同时利用多指数连续相位调制的脉冲幅度调制分解对定时误差估计器进行简化。仿真结果表明,优化后的早迟环定时误差捕获范围最大可达±0.5个符号周期,估计精度在中低信噪比下能够接近修正的克拉美罗界,在高信噪比下也有较好的估计性能;当早迟环定时支路的分支度量简化至最大似然序列检测的1/8时,对多进制、部分响应的多指数连续相位调制信号,造成的解调性能损失小于0.5 d B。
