An All-Programmable 16-nm RFSoC for Digital-RF Communications

Farley, Brendan; McGrath, John; Erdmann, Christophe

doi:10.1109/mm.2018.022071136

Cited by 26 publications

(16 citation statements)

References 3 publications

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“…The radar has four Tx and four Rx channels, and its virtual array is forming a uniform linear array (ULA) with 16 elements in λ/2-spacing. The baseband signals are generated and stored using a Xilinx RFSoC [33], while the design of the Tx signal and the signal processing is done offline for maximum flexibility and accuracy. The radar parameters are presented in Table I. The repeater elements are each build by two amplifiers and one mixer, thus being similar to the repeater from [22].…”

Section: Measurementsmentioning

confidence: 99%

OFDM-Based Radar Network Providing Phase Coherent DOA Estimation

Werbunat¹,

Meinecke²,

Schweizer³

et al. 2021

IEEE Trans. Microwave Theory Techn.

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Next-generation radar sensors require imaging capabilities with high angular resolution. As for a single sensor, the aperture, and thus the achievable resolution, is limited due to the constraints of the front end, radar networks consisting of multiple sensors are a possible solution. However, their incoherency usually makes joint angle estimation impossible. This article presents a network concept consisting of an orthogonal frequency-division multiplexing (OFDM) radar and repeater elements, which receive the reflections from targets and retransmit them back to the radar. Thereby, any frequency conversion from radio frequency to baseband and vice versa is omitted such that the signal remains coherent to the initial transmit signal. To distinguish the bistatic signal transmitted by the repeater from the monostatic one of the OFDM radar, the orthogonal subcarrier structure of OFDM waveforms is exploited by combining a sparse radar transmit signal with a low-frequency modulation in the repeater. This allows to evaluate the bistatic signals at the radar with standard multiple-input-multiple-output (MIMO)-OFDM signal processing, leading to separate range-Doppler images for each virtual channel. Finally, it is shown that this method offers a coherent angular estimation based on the extended aperture of the network. For this purpose, a method to establish phase coherency by a reconstruction of the modulation phase is presented. The network concept is proved with measurements at 77 GHz.

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Section: Measurementsmentioning

confidence: 99%

OFDM-Based Radar Network Providing Phase Coherent DOA Estimation

Werbunat¹,

Meinecke²,

Schweizer³

et al. 2021

IEEE Trans. Microwave Theory Techn.

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“…, the resulting actually applied modulation symbols (19) have non-uniform amplitudes and arbitrary phases such that the unitary amplitudes alphabet constraint assumed for (4) is violated. Yet, the codes have the peculiarity that their periodic CCF…”

Section: A Zero-correlation Zone Cdm (Zcz-cdm)mentioning

confidence: 99%

“…Its virtual array is a uniform linear array (ULA) of spacing λ 2 with 16 elements total. To generate the baseband transmit signal and store the baseband receive signals, a Xilinx RFSoC [19] is used. The signal evaluation is performed offline in MATLAB.…”

Section: A Signal Properties and Measurement Setupmentioning

confidence: 99%

Coded OFDM Waveforms for MIMO Radars

Knill¹,

Embacher²,

Schweizer³

et al. 2021

IEEE Trans. Veh. Technol.

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Emerging digital radar concepts such as orthogonal frequency-division multiplexing (OFDM) allow flexible signal generation. This opens up new opportunities in waveform design in a multiple-input multiple-output (MIMO) system such as introducing coding for signal multiplexing. In this article, coded MIMO OFDM waveforms are proposed and investigated that allow continuous and simultaneous wideband transmission for all transmitters of a multiple transmit and receive antenna array for spatial radar environment perception. Challenges for coded MIMO OFDM radar operation are derived, and three coded MIMO strategies are introduced and analyzed. Their potential is validated and compared to the standard subcarrier interleaving OFDM approach using simulations and measurements of an experimental 4×4 MIMO OFDM radar at 77 GHz.

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“…阿雷西博的巡天项目ALFA (Arecibo L-band Feed Array) [16] 、银河盘片巡天PALFA (Pulsar-AFLA) [17] 、 ALFALFA (Arecibo Legacy Fast ALFA) 20…”

Section: 两个相关器、一个多路器能完成自相关与互相关unclassified