频率多普勒分复用通信感知一体化波形OA

The 6G mobile communication system aims to achieve full spectrum access,sharing the frequency bands used by radar systems to conserve spectral resources and minimize inter-system interference.The deep integration of communication and sensing is crucial,with integrated communication-sensing waveforms emerging as a key technology.OFDM and OTFS are considered prime candidates for such integration.However,OFDM's inadequate performance in handling time-selective fading limits its applicability in future high-mobility scenarios,whereas OTFS,despite its excellent performance in this regard,is hampered by high complexity.This paper introduces a FDDM integrated communication-sensing waveform,employing frequency-Doppler domain symbols for modulation at the transmitter,and utilizing Doppler maximum ratio combining for demodulation at the communication receiver.For sensing,the paper combines periodogram analysis and channel estimation techniques for independent estimation of target distance and velocity.Thanks to the Doppler diversity gain,FDDM achieves similar communication performance to OTFS in high-speed mobile scenarios,and the complexity is lower than OTFS.In terms of sensing performance,FDDM is similar to OTFS and slightly better than OFDM.