Design and optimization of ISAC signal for urban railway T2T based on OTFS
In the context of the shortage of B5G/6G commercial spectrum resources,we reformed existing urban railway train operation control facilities to realize train information transmission based on train-to-train(T2T)communication.We proposed an Integrated Sensing and Communication(ISAC)signal based on Orthogonal Time Frequency Space(OTFS)modulation.First,we proposed time domain signal fuzzy function models for both single symbol and multi-symbol OTFS,simulated and compared their distance fuzziness and velocity fuzziness to verify the superiority of the original multi-symbol OTFS signal perception performance.Then,we proposed the combination of Ant Colony Optimization(ACO)algorithm and classical selection mapping(SLM)algorithm,named ACO-SLM algorithm,and designed an OTFS system transmitter structure by using the ACO-SLM algorithm to suppress the peak-average power ratio of the original OTFS signal.The suppression effect was compared horizontally and vertically through simulation experiments.Finally,the OTFS time domain signal fuzziness and transmission bit error rate were simulated after processing by the ACO-SLM algorithm.The research results show that by changing the parameters of the ACO-SLM algorithm for horizontal comparison,with 16QAM constellation modulation as the input sequence,the ACO-SLM algorithm with a phase factor group number of 16 was used to process the OTFS signal,achieving the lowest peak-to-average power ratio of 6.03.Longitudinal comparison shows that the ACO-SLM algorithm has a better inhibition effect on the peak-to-average power ratio than other traditional algorithms.Fuzzy simulation analysis of the multi-symbol OTFS time domain signal processed by the ACO-SLM algorithm shows that its ranging and velocity measurement performance are improved,and the transmission bit error rate is almost not affected compared with the OTFS signal processed by traditional algorithms.The research results provide a theoretical basis for the perception integration of urban rail T2T communication for B5G/6G and train operation control based on T2T communication.
integrated sensing and communicationorthogonal time frequency spaceant colony optimizationselected mappingpeak-to-average power ratio
万方数据
维普
