Coded OFDM Waveforms for MIMO Radars

Knill, Christina; Embacher, Felix; Schweizer, Benedikt; Stephany, Simon; Waldschmidt, Christian

doi:10.1109/tvt.2021.3073268

Cited by 15 publications

(19 citation statements)

References 21 publications

(46 reference statements)

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“…The sensing method [11,12] has been extensively applied in the past decade and has become a de facto standard for OFDM radar, particularly in automotive sensing [13][14][15][16][17][18][19][20][21][22][23]. For illustration convenience, we call the method [11] the classical OFDM sensing (COS) hereafter.…”

Section: Background and Motivationmentioning

confidence: 99%

“…More specifically, the scheme makes antenna m only use sub-carriers m + iM for m = 0, 1, • • • , M − 1 and i = 0, 1, • • • , where M is the antenna number. However, as noted in [19][20][21][22], the equidistant interleaving can reduce the unambiguously measurable distance of a MIMO-OFDM radar. To address the issue, a non-equidistant sub-carrier interleaving scheme is proposed in [19], where the genetic algorithm (GA) is used to maximize the ranging performance in terms of the sub-carrier interleaving patterns of transmitter antennas.…”

Section: Background and Motivationmentioning

confidence: 99%

“…In [20], the random time-frequency multiplexing is proposed to enhance the inter-antenna signal orthogonality of a MIMO-OFDM radar. For the same purpose, coded MIMO-OFDM radars are developed in [21,22], where special coding over time-, frequency-, space-and joint-domains are developed.…”

Section: Background and Motivationmentioning

confidence: 99%

See 2 more Smart Citations

Joint Communications and Sensing Employing Multi- or Single-Carrier OFDM Communication Signals: A Tutorial on Sensing Methods, Recent Progress and a Novel Design

Zhang

Huang

et al. 2022

Sensors

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Joint communications and sensing (JCAS) has recently attracted extensive attention due to its potential in substantially improving the cost, energy and spectral efficiency of Internet of Things (IoT) systems that need both radio frequency functions. Given the wide applicability of orthogonal frequency division multiplexing (OFDM) in modern communications, OFDM sensing has become one of the major research topics of JCAS. To raise the awareness of some critical yet long-overlooked issues that restrict the OFDM sensing capability, a comprehensive overview of OFDM sensing is provided first in this paper, and then a tutorial on the issues is presented. Moreover, some recent research efforts for addressing the issues are reviewed, with interesting designs and results highlighted. In addition, the redundancy in OFDM sensing signals is unveiled, on which, a novel method is based and developed in order to remove the redundancy by introducing efficient signal decimation. Corroborated by analysis and simulation results, the new method further reduces the sensing complexity over one of the most efficient methods to date, with a minimal impact on the sensing performance.

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Section: Background and Motivationmentioning

confidence: 99%

Section: Background and Motivationmentioning

confidence: 99%

See 1 more Smart Citation

Joint Communications and Sensing Employing Multi- or Single-Carrier OFDM Communication Signals: A Tutorial on Sensing Methods, Recent Progress and a Novel Design

Zhang

Huang

et al. 2022

Sensors

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“…Beside simple time-division multiplexing, which is suboptimal in terms of transmit power distribution and dynamic targets, OFDM radar also allows for the simultaneous operation of all transmitters. The two most prominent options are based on code multiplexing [33] and equidistant subcarrier multiplexing [34]. Both methods have their disadvantages, as code lengths increase with the number of transmitters, cross-correlation properties of code sequences are not ideal, and standard equidistant subcarrier allocation reduces the unambiguous range (i.e., the number of subcarriers available to each virtual transceiver) by a factor of N Tx .…”

Section: B Signal Modelmentioning

confidence: 99%

Hybrid Beam-Steering OFDM-MIMO Radar: High 3-D Resolution With Reduced Channel Count

Schneider

Rösch

Tessmann

et al. 2021

IEEE Trans. Microwave Theory Techn.

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We report on the realization of a multichannel imaging radar that achieves uniform 2-D cross-range resolution by means of a linear array of a special form of leaky-wave antennas. The presented aperture concept enables a tradeoff between the available range resolution and a reduction in the number of channels required for a given angular resolution. The antenna front end is integrated within a multichannel radar based on stepped-carrier orthogonal frequency-division modulation, and the advantages and challenges specific to this combination are analyzed with respect to signal processing and a newly developed calibration routine. The system concept is fully implemented and verified in the form of a mobile demonstrator capable of soft real-time 3-D processing. By combining radio frequency (RF) components operating in the W -band (85-105 GHz) with the presented aperture, a 3-D resolution of less than 1.5 • ×1.5 • × 15 cm is demonstrated using only eight transmitters and eight receivers.

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“…A multiplexing technique denoted as auto-correlationbased code-division multiplexing (AC-CDM) is proposed in [22]. This multiplexing technique transmits the same data on all Tx antennas and on all subcarriers but with unique time delays (implemented via phase rotations in the frequency domain).…”

Section: Introductionmentioning

confidence: 99%

Range-Division Multiplexing for MIMO OFDM Joint Radar and Communications

Lang

Hofbauer

Feger

et al. 2023

IEEE Trans. Veh. Technol.

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An orthogonal frequency-division multiplexing (OFDM) waveform enables simultaneous radar sensing and communications. In the multiple-input multiple-output (MIMO) case with several transmit (Tx) antennas, multiplexing the transmit signals is usually implemented using equidistant subcarrier interleaving (ESI), thus allowing the separation of the transmit signals in frequency domain. In this work, a multiplexing technique denoted as range-division multiplexing (RDMult) is analyzed, which allows separating signals radiated by different Tx antennas along the range axis of a range-Doppler map. This work also investigates the effects of RDMult on the communication task. It turns out that RDMult heavily distorts the channel statistics by introducing a repetitive pattern of deep fading holes, which severely distort the transmission of data. To combat this issue, this work proposes a communication system especially designed for RDMult, including methods for data estimation, channel estimation and synchronization. Simulations confirm the effectiveness of these concepts in terms of bit error ratio (BER) performance.

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Coded OFDM Waveforms for MIMO Radars

Cited by 15 publications

References 21 publications

Joint Communications and Sensing Employing Multi- or Single-Carrier OFDM Communication Signals: A Tutorial on Sensing Methods, Recent Progress and a Novel Design

Joint Communications and Sensing Employing Multi- or Single-Carrier OFDM Communication Signals: A Tutorial on Sensing Methods, Recent Progress and a Novel Design

Hybrid Beam-Steering OFDM-MIMO Radar: High 3-D Resolution With Reduced Channel Count

Range-Division Multiplexing for MIMO OFDM Joint Radar and Communications

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