2026· IEEE Open Journal of the Communications Society· Vol 7, pp. 9209-9229· 0 citations· 56 references
Abstract
This paper considers a hybrid frequency- and phase-shift keying (FPK) waveform for integrated sensing and communications (ISAC). Compared to FSK-based ISAC waveforms in the literature, the proposed waveform shows similar local radar estimation accuracy and superior performance both in terms of data rates and radar global accuracy. The ambiguity function (AF) is used as a tool to evaluate the radar performance of the FPK waveform. We show that incorporating phase modulation into the FSK waveform generally has an insignificant effect on the sharpness of the AF main lobe while reducing the values of the peak sidelobe levels (SLs) in the AF. We also derive the Cramer-Rao lower bounds of the delay and Doppler shift estimates for the FPK waveform. Additionally, since the AF SLs vary depending on the data embedded in the waveform, we analyze and provide approximations for the distribution of the AF SLs. Finally, we analyze the error performance of both the optimal and suboptimal communication receivers, and derive the nearest-neighbors approximation for the symbol error probability using the optimal receiver. Numerical examples illustrate the accuracy of our approximations and show the performance improvements of the FPK waveform compared to FSK.
This paper analyses frequency shift keying (FSK)-based waveforms for joint communications and radar (JCR) in terms of radar estimation local accuracy. More specifically, the Cramer-Rao lower bounds for delay and Doppler shift estimation are characterised using the root mean square (RMS) time duration and RMS bandwidth...
Tian Han, Peter J. Smith, R. Senanayake et al.· IEEE Transactions on Wireles...· 0 citations
This paper characterizes two discrete AF formulations for different Doppler regimes, namely the discrete periodic AF (DP-AF) and fast-slow-time AF (FST-AF), and derives closed-form expressions for their expected squared values and proves that attaining the lower bound at non-zero Doppler requires a periodic pilot patte...
Jia-Lin Wu, Fan Liu, Ying Zhang et al.· 0 citations
Orthogonal time-frequency space (OTFS) modulation is a promising waveform for integrated sensing and communication (ISAC) in high-mobility environments, where both large Doppler shifts and target delays must be accurately handled. Existing CP-OTFS radar analyses often assume CP-preserving target delays, for which the r...
Sirine Hamrouni, J. Baudais, S. Méric et al.· Telecom· 0 citations
High-mobility dual-functional radar–communication systems require a common waveform that combines delay–Doppler information organization, sensing resolution, and power-efficient transmission. We present a cyclically closed constant-envelope orthogonal time frequency space–continuous phase modulation–linear frequency mo...
Wen-Hui Xue, Peng Chen, Chun-Guo Li et al.· Italian National Conference...· 0 citations
Avionics systems often operate in dense electromagnetic environments, requiring both wideband signal interception and accurate radar frequency measurement. However, achieving high resolution typically demands expensive hardware and introduces long processing delays. To address this challenge, we present a complete rada...
Kai-Xuan Dai· International Conference on...· 0 citations
This work addresses the synthesis of constant-modulus (CM) radar waveforms whose range-Doppler behavior approximates a prescribed profile in the presence of multiple interference sources. Since the interference power at the matched-filter output amounts to an average of the slow-time ambiguity function (STAF) of the tr...
