  Integrated sensing and communication (ISAC) is a significant application
scenario in future wireless communication networks, and sensing capability of a
waveform is always evaluated by the ambiguity function. To enhance the sensing
performance of the orthogonal time frequency space (OTFS) waveform, we propose
a novel time-domain interleaved cyclic-shifted P4-coded OTFS (TICP4-OTFS) with
improved ambiguity function. TICP4-OTFS can achieve superior autocorrelation
features in both the time and frequency domains by exploiting the
multicarrier-like form of OTFS after interleaved and the favorable
autocorrelation attributes of the P4 code. Furthermore, we present the
vectorized formulation of TICP4-OTFS modulation as well as its signal structure
in each domain. Numerical simulations show that our proposed TICP4-OTFS
waveform outperforms OTFS with a narrower mainlobe as well as lower and more
distant sidelobes in terms of delay and Doppler-dimensional ambiguity
functions, and an instance of range estimation using pulse compression is
illustrated to exhibit the proposed waveform\u2019s greater resolution.
Besides, TICP4-OTFS achieves better performance of bit error rate for
communication in low signal-to-noise ratio (SNR) scenarios.
