基于虚拟调制指数集的多指数CPM减相位状态检测

Reduced phase-state detection based on virtual modulation indexes for Multi-h CPM

针对多指数连续相位调制(Multi-h CPM),提出了基于虚拟调制指数集简化相位状态的低复杂度检测方法。在接收端构造与发送端不同的调制指数集,并采用逐幸存路径处理的方法解决收发调制指数不一致所带来的失配问题。当虚拟调制指数的分母远小于实际发送信号的调制指数分母时,相干序列检测的相位状态可被有效简化,从而降低Multi-h CPM相干检测的复杂度。与简化相关状态的频率脉冲截断(FPT)算法联合使用,可进一步降低接收端的网格状态数。仿真结果表明,针对先进靶场遥测(ARTM)CPM信号可设计多组基于虚拟调制指数集的简化接收方案,其中,当虚拟调制指数集设为[3/4.2/4]时,网格状态数可由最优检测的512降低为64,性能损失小于0.05 dB。进一步联合FPT算法后,网格状态数可降为16,性能仅损失0.75 dB。

Simplified detection with reduced phase-state based on virtual modulation indexes was designed for Multi-h CPM.Multiple sets of modulation indexes different from the transmitter were constructed in the receiver,and the per-survivor processing was used to solve the mismatch caused by the inconsistency of the modulation indexes between the receiver and the transmitter.When the denominator of virtual modulation index was much smaller than the original denominator of actual transmitted signal,the phase states of coherent sequence detection could be effectively simplified,thus the complexity of coherent detection for Multi-h CPM could be reduced.The trellis could be simplified further via combining with the frequency pulse truncation(FPT)used for simplifying correlation states.The simulation results show that for advanced range telemetry(ARTM)CPM signal,various simplified receiving schemes based on virtual modulation indexes can be designed.When the virtual modulation indexes are set to [3/4.2/4],the number of trellis states can bereduced from 512(in optimal detection)to 64,but the performance loss is less than 0.05 dB.Further combined with FPTalgorithm,the number of trellis states can be reduced to 16,while the performance loss is only 0.75 dB.