Dual-function FDA MIMO radar-communications system employing costas signal waveforms

Nusenu, Shaddrack Yaw; Wang, Wen-Qin

doi:10.1109/radar.2018.8378526

Cited by 25 publications

(15 citation statements)

References 31 publications

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“…By minimising the Cramér-Rao lower bounds (CRLB), an optimal sub-array design strategy was considered for FDA radar target localisation in [18]. Owing to the additional degrees-of-freedom in range domain, FDA possesses potential advantages over traditional PA in joint angle and range localisation [11], range-ambiguous clutter and interferences suppression [19], multipath mitigation [20], transmit beamspace [21], high-resolution imaging [22], and dual-function radarcommunication [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Space‐time matched filter design for interference suppression in coherent frequency diverse array

Wang

Liao

et al. 2020

IET signal process.

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By transmitting a single frequency-shifted waveform, coherent frequency diverse array (FDA) can provide a simple way to realize full spatial coverages with stable gains. Owing to the range-angle dependency in coherent FDA, the authors implement a two-dimensional angle-time matched filter to perform equivalent transmit beamforming and matched filtering simultaneously. However, such filter structures merely control main-lobes of equivalent transmit beams towards target directions. It fails to form nulls at interference directions. Moreover, traditional adaptive beamforming by designing adaptive weight vectors are no longer applicable. Additionally, they find that the range resolution scales linearly with the element number. To tackle these issues, a space-time matched filter (STMF) in combination with the hybrid coding technique is proposed. Aiming at mitigating interferences, the STMF is designed with a formulation of quadratically constrained quadratic programing. By relaxation of quadratic constraints, the hard non-convex problem can be turned into the second-order cone programing to obtain optimal filter parameters. Furthermore, the hybrid coding technique is devised to jointly improve the range resolution. Numerical experiments of both two-dimensional range-angle outputs and one-dimensional range profiles via filtering are provided, which demonstrate that the STMF with hybrid coding can effectively suppress sidelobe interferences with a range resolution enhancement.

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Section: Introductionmentioning

confidence: 99%

Space‐time matched filter design for interference suppression in coherent frequency diverse array

Wang

Liao

et al. 2020

IET signal process.

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“…In contrast, the PA lacks range-time-focusing transmit beam-steering. Actually, the FDA has been widely investigated in the radar fields [30][31][32][33][34][35][36][37][38]. Recently, because of FDA potentials, it has been utilized in communication applications [27,[39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Butler Matrix Frequency Diverse Retrodirective Array Beamforming: An Energy-Efficient Technique for mmWave Networks

Nusenu

Asare

2020

Wireless Communications and Mobile Computing

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Millimeter-wave (mmWave) networks with the frequency spectrum ranging from 30 GHz (with wavelength 10 mm) to 300 GHz (with wavelength 1 mm), can support massive wireless data in fifth-generation (5G) systems. Importantly, large colocated antenna elements can be exploited at the base station (BS) to facilitate beam-steering synthesis along the users’ directions. This paper proposes the Butler matrix (BM) frequency diverse retrodirective array (BM-FDRA) beamforming network at the BS for multiuser communications in mmWave networks. We utilize the orthogonal feature of the M×M BM with M elements of the FDRA to create directional beams for concurrent transmission towards different users in range-angle locations. The proposed scheme has the following merits: (a) there is beam-steering orthogonality without beam interferences and (b) there is automatic tracking functionality, i.e., the prior knowledge on the user location is not required by the proposed BM-FDRA at the BS. The proposed method can serve multiple users concurrently using the beam-steering orthogonality property. Furthermore, performance metrics such as the multiaccess secrecy sum rate (SSR) model, bit error rate (BER), system capacity, and energy efficiency are examined. The proposed BM-FDRA scheme achievements are highlighted via simulation results.

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“…By exploiting the advantage of FDA, practical applications of tremendous potential have been explored, such as joint angle and range localisation [20][21][22], deceptive interference mitigation [23], range-ambiguous clutter suppression [24][25][26][27], dual-function radar communication [28][29][30] and high-resolution imaging [31,32]. In [33], a bistatic FDA radar was introduced in application of the lowprobability-of-intercept radar to limit returns from undesirable range cells.…”

Section: Introductionmentioning

confidence: 99%

Subarray‐based coherent pulsed‐LFM frequency diverse array for range resolution enhancement

Wang

Liao

et al. 2020

IET signal process.

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Coherent frequency diverse array (FDA) can provide the full spatial illumination with a stable transmit gain by employing a single frequency-shifted waveform. However, the authors find that the range resolution is scaled linearly with the number of elements. In this work, the problem is first quantitatively analysed through mathematical derivation. To solve the issue, a subarray-based coherent FDA transmitting pulsed linear frequency modulation signals is proposed. The essence of the subaperture technique is to partition the transmit antenna array into multiple regular or irregular subarrays, wherein an identical carrier frequency is utilised in each subarray. Meanwhile, distinct carrier frequencies are adopted between subarrays. Moreover, the multi-dimensional ambiguity function is studied to assess the properties including the range resolution, spatial coverage and sidelobe level. Simulation results demonstrate that the proposed approach has superiorities in range resolution enhancement and range sidelobe reduction.

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Dual-function FDA MIMO radar-communications system employing costas signal waveforms

Cited by 25 publications

References 31 publications

Space‐time matched filter design for interference suppression in coherent frequency diverse array

Space‐time matched filter design for interference suppression in coherent frequency diverse array

Butler Matrix Frequency Diverse Retrodirective Array Beamforming: An Energy-Efficient Technique for mmWave Networks

Subarray‐based coherent pulsed‐LFM frequency diverse array for range resolution enhancement

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