Experimental Investigation of Phase Coded FMCW for Sensing and Communications

Kumbul, Utku; Petrov, Nikita; Zwan, Fred van der; Vaucher, C.S.; Yarovoy, Alexander

doi:10.23919/eucap51087.2021.9411464

Cited by 15 publications

(18 citation statements)

References 14 publications

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“…However, the modulation signal m(t − τ 0 ) should be removed from the dechirped signal before extracting the range information via FFT. For a short-range radar application m(t − τ 0 ) ≈ m(t), then the dechirped signal can be demodulated by multiplying (4) with m * (t) directly [14]. However, the applicability of this processing is limited to the short range applications with R max ≤ c/(2B m ), where B m is the bandwidth of modulation signal m(t).…”

Section: B Group Delay Filter Receivermentioning

confidence: 99%

Receiver Structures for Phase Modulated FMCW Radars

Kumbul

Petrov

Vaucher

et al. 2022

2022 16th European Conference on Antennas and Propagation (EuCAP)

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Two receiver structures of phase modulated FMCW signals with low ADC sampling requirement are investigated, namely the matched filter of the dechirped signal and the group delay filter approach. The sensing performance of the investigated receiver strategies are analyzed in application to BPSK modulated chirp. Numerical simulations demonstrate that both techniques provide comparable performance for low to moderate bandwidth of the modulation signal. Matched filter outperforms the group delay receiver for the modulation waveform with large bandwidth, hence with the price of larger computational complexity.

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Section: B Group Delay Filter Receivermentioning

confidence: 99%

Receiver Structures for Phase Modulated FMCW Radars

Kumbul

Petrov

Vaucher

et al. 2022

2022 16th European Conference on Antennas and Propagation (EuCAP)

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“…For a short-range radar application e.g. indoor monitoring, the delay can be neglected s(t − τ 0 ) ≈ s(t), and the mixer output can be decoded by multiplying (7) with s * (t) directly [24]. However, this assumption does not hold for the applications with R ≥ c/(2B c ), where B c is the bandwidth of phase-coded signal s(t).…”

Section: Signal Model and Transceiver Structurementioning

confidence: 99%

“…Applying coding to FMCW improves the waveform diversity and ensures the discrimination of self-transmitted signals from the waveforms transmitted by other radars [21]. Furthermore, the phase-coded FMCW enables joint sensing and communication [22]- [24]. In [18], matched filtering is used as a receiver strategy to process the PC-FMCW.…”

Section: Introductionmentioning

confidence: 99%

“…The BPSK coding causes abrupt phase changes that lead to large leakage of the BPSK spectrum outside of the 3-dB bandwidth. As a consequence, the BPSK only with a small bandwidth compared to the sampling frequency (a few chips per chirps) can be used for sensing [24]. In the case of the BPSK code bandwidth being comparable to the sampling frequency of the analog-to-digital converter (ADC), the sidelobe level significantly increases.…”

Section: Introductionmentioning

confidence: 99%

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Smoothed Phase-Coded FMCW: Waveform Properties and Transceiver Architecture

Kumbul¹,

Petrov²,

Vaucher³

et al. 2022

Preprint

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Smoothed phase-coded frequency modulated continuous waveform (SPC-FMCW), which is aimed to improve the coexistence of multiple radars operating within the same frequency bandwidth, is studied and the receiving strategy with a low ADC sampling requirement is investigated. The Gaussian filter is applied to obtain smooth phase transition, and the phase lag compensation is performed on transmitted phase code to enhance decoding. The proposed waveform is examined in different domains, and its waveform properties are analysed theoretically and demonstrated experimentally. Both the simulation and experimental results show that the introduced waveform with the investigated processing steps helps to combine all advantages of the FMCW waveform including hardware simplicity and small operational bandwidth of the receiver with advantages of the phase coding.

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“…Recently, there has been growing interest in the phase-coded frequency-modulated continuous waveform (PC-FMCW) radar [21][22][23]. The idea of using phase coding for FMCW enables radar-communication (RadCom) coexistence [24].…”

Section: Introductionmentioning

confidence: 99%

Automotive radar interference study for different radar waveform types

Kumbul

Uysal

Vaucher

et al. 2021

IET Radar Sonar & Navi

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Mutual interference between different radar waveforms used in automotive radar applications is studied. The existing interference analysis is extended to a generalised radar‐to‐radar interference equation that covers most of the common interference scenarios for automotive radar systems. The outcome of the generalised equation is demonstrated for a number of typical scenarios where radars with different continuously transmitting waveforms are involved. The proposed equation can be used to characterise the received interference and its features by analysing the instantaneous beat frequency of the victim radar. Moreover, an interference analysis of phase‐coded frequency‐modulated continuous waveforms is performed and demonstrated experimentally by using real‐time automotive radars for the first time in the literature. The experimental results corroborate the interference analysis of different waveforms and validate the proposed generalised interference equation under various conditions.

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Experimental Investigation of Phase Coded FMCW for Sensing and Communications

Cited by 15 publications

References 14 publications

Receiver Structures for Phase Modulated FMCW Radars

Receiver Structures for Phase Modulated FMCW Radars

Smoothed Phase-Coded FMCW: Waveform Properties and Transceiver Architecture

Automotive radar interference study for different radar waveform types

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