通信学报2026，Vol.47Issue(1)：174-183,10.DOI:10.11959/j.issn.1000−436x.2026006
面向时频双选信道的高鲁棒性多路频移Chirp调制
Highly robust multiple frequency shift Chirp modulation for time-frequency dual-selected channels
摘要
Abstract
Aiming at the problem of signal demodulation performance degradation caused by time delay and Doppler shift in ionospheric time-frequency dual-selected channels,a highly robust multiple frequency shift chirp modulation(RO-M-FSCM)method based on linear frequency modulation was proposed.Through address code design,identical time-frequency resources were mapped into multiple parallel transmission channels exhibiting fractional orthogonality.Real-time correction of the information-branch demodulation window alignment with the main path was achieved by the synchronization branch.An equivalent offset was introduced to reveal the coupling effect of delay and Doppler shift on the signal's spectral peak in the fractional domain.Consequently,the asymptotic closed-form expression for the symbol error rate of RO-M-FSCM signals was derived,and the length of robust code was optimized.The received SNR for non-coherent demodulation of RO-M-FSCM signals was enhanced based on a robust-domain multipath energy aggregation method.Simulation results demonstrate that under the typical ionospheric broadband channel environment,the RO-M-FSCM scheme achieves co-optimization of transmission reliability and transmission rate,which provides an effective so-lution for ultra-long-distance communication in complex time-frequency dual-selected channels.关键词
线性频率调制/电离层通信/多路复用/同步机制/远距离无线电Key words
linear frequency modulation/ionospheric communication/multiplexing/synchronization mechanism/LoRa分类
信息技术与安全科学引用本文复制引用
张成文,谢靖宇,史军,钟美琴,管政涵,韩帅..面向时频双选信道的高鲁棒性多路频移Chirp调制[J].通信学报,2026,47(1):174-183,10.基金项目
国家自然科学基金资助项目(No.62271169) （No.62271169）
中国无锡物联网创新促进中心开放研究基金资助项目(No.2022SP-T09-C)The National Natural Science Foundation of China(No.62271169),The Open Research Fund of Wuxi IoT Inno-vation Promotion Center of China(No.2022SP-T09-C) （No.2022SP-T09-C）
