Joint Radar-Communication: Low Complexity Algorithm and Self-Interference Cancellation

Zeng, Yonghong; Ma, Yugang; Sun, Sumei

doi:10.1109/glocom.2018.8647502

Cited by 26 publications

(17 citation statements)

References 19 publications

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“…The paper also presents an alternative to forward collision detection in vehicles based on the communication waveform. In [13], new algorithms based on wireless communication standards such as IEEE 802.11ad and IEEE 802.11p have been proposed for radar range and velocity estimation.…”

Section: A Related Workmentioning

confidence: 99%

Frequency Permutations for Joint Radar and Communications

Senanayake¹,

Smith²,

Han³

et al. 2021

Preprint

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This paper presents a new joint radar and communication technique based on the classical stepped frequency radar waveform. The randomization in the waveform, which is achieved by using permutations of the sequence of frequency tones, is utilized for data transmission. A new signaling scheme is proposed in which the mapping between incoming data and waveforms is performed based on an efficient combinatorial transform called the Lehmer code. Considering the optimum maximum likelihood (ML) detection, the union bound and the nearest neighbour approximation on the communication block error probability is derived for communication in an additive white Gaussian noise (AWGN) channel. The results are further extended to incorporate the Rician fading channel model, of which the Rayleigh fading channel model is presented as a special case. Furthermore, an efficient communication receiver implementation is discussed based on the Hungarian algorithm which achieves optimum performance with much less operational complexity when compared to an exhaustive search. From the radar perspective, two key analytical tools, namely, the ambiguity function (AF) and the Fisher information matrix are derived. Furthermore, accurate approximations to the Cramer-Rao lower bounds (CRLBs) on the delay and Doppler estimation errors are derived based on which the range and velocity estimation accuracy of the waveform is analysed. Numerical examples are used to highlight the accuracy of the analysis and to illustrate the performance of the proposed waveform.

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Section: A Related Workmentioning

confidence: 99%

Frequency Permutations for Joint Radar and Communications

Senanayake¹,

Smith²,

Han³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…The actual radar processing building on the known transmit waveform can be implemented in multiple ways [28], [35], either with time-domain or subcarrier-domain processing. In this work, similar to, e.g., [3]- [6], [11], [36], we adopt subcarrier-domain processing utilizing directly the transmit and receive grids of samples, i.e., X and Y, respectively. For the classical matched filtering-based approach [28], represented at OFDM symbol level, a new processed matrix G can be defined as G MF = Y X * , where refers to element-wise (Hadamard) product while the superscript (·) * denotes complex conjugation.…”

Section: A System Model and Basic Subcarrier Processingmentioning

confidence: 99%

“…This calls for new hardware, to replace the TDD RF switching with more elaborate circulator [20], [23]- [25] or EBD [12], [26], [27] type of circuitries, and has been studied actively over the recent years, under the inband full-duplex radio terminology, with primarily communications applications in mind, see, e.g., [19], [23], [37]- [45]. In the radar context, the self-interference (SI) stemming from the direct coupling of the transmit signal to the receiver can be interpreted as a strong static target at a very short distance [11], [12], [33], [46]. Hence, one could argue that as long as a certain level of TX-RX isolation can be provided, such that the low noise amplifier (LNA) and the rest of the sensitive receiver electronics can tolerate the remaining SI, the true echoes stemming from true targets can be separated in the radar processing.…”

Section: Self-interference Problem and Cancellation Solutions Amentioning

confidence: 99%

“…For the classical matched filtering-based approach [28], represented at OFDM symbol level, a new processed matrix G can be defined as G MF = Y X * , where refers to element-wise (Hadamard) product while the superscript (•) * denotes complex conjugation. Alternatively, the reflection channel estimation-like scheme, utilized also in [3], [4], [6], [11], reads G CH = Y X, where denotes element-wise division.…”

Section: A System Model and Basic Subcarrier Processingmentioning

confidence: 99%

“…Then, we address a fundamental implementation challenge stemming from the limited TX-RX isolation [11], [19]- [22] in real base stations and the corresponding transmitter self-interference at the radar. Our main emphasis is on the challenging monostatic scenario where the same antenna system of the eNB/gNB is shared between the TX and RX, building, e.g., on a circulator [20], [23]- [25] or an electrical balance duplexer (EBD) [12], [26], [27].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Full-Duplex OFDM Radar With LTE and 5G NR Waveforms: Challenges, Solutions, and Measurements

Barneto

Riihonen

Turunen

et al. 2019

IEEE Trans. Microwave Theory Techn.

226

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This paper studies the processing principles, implementation challenges, and performance of OFDM-based radars, with particular focus on the fourth-generation Long-Term Evolution (LTE) and fifth-generation (5G) New Radio (NR) mobile networks' base stations and their utilization for radar/sensing purposes. First, we address the problem stemming from the unused subcarriers within the LTE and NR transmit signal passbands, and their impact on frequency-domain radar processing. Particularly, we formulate and adopt a computationally efficient interpolation approach to mitigate the effects of such empty subcarriers in the radar processing. We evaluate the target detection and the corresponding range and velocity estimation performance through computer simulations, and show that highquality target detection as well as high-precision range and velocity estimation can be achieved. Especially 5G NR waveforms, through their impressive channel bandwidths and configurable subcarrier spacing, are shown to provide very good radar/sensing performance. Then, a fundamental implementation challenge of transmitter-receiver (TX-RX) isolation in OFDM radars is addressed, with specific emphasis on shared-antenna cases, where the TX-RX isolation challenges are the largest. It is confirmed that from the OFDM radar processing perspective, limited TX-RX isolation is primarily a concern in detection of static targets while moving targets are inherently more robust to transmitter self-interference. Properly tailored analog/RF and digital selfinterference cancellation solutions for OFDM radars are also described and implemented, and shown through RF measurements to be key technical ingredients for practical deployments, particularly from static and slowly moving targets' point of view.

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Joint range and velocity estimation for orthogonal frequency division multiplexing‐based high‐speed integrated radar and communications system

Wang

Zhang

2022

IET Communications

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Joint Radar-Communication: Low Complexity Algorithm and Self-Interference Cancellation

Cited by 26 publications

References 19 publications

Frequency Permutations for Joint Radar and Communications

Frequency Permutations for Joint Radar and Communications

Full-Duplex OFDM Radar With LTE and 5G NR Waveforms: Challenges, Solutions, and Measurements

Joint range and velocity estimation for orthogonal frequency division multiplexing‐based high‐speed integrated radar and communications system

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