Characterization of diversity approaches for LFM stretch-processed waveforms

Welstead, Stephen T.

doi:10.1109/wddc.2007.4339453

Cited by 10 publications

(5 citation statements)

References 2 publications

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“…Welstead studied the relationship between the chirp rate and the level of interferences between two LFM signals with the same pulse width and showed that, as the difference of the chirp rates of two LFM waveforms increases, they become less correlated [ 9 ]. Focusing on the characteristics of the chirp rate diversity of a single LFM signal, in [ 9 , 10 ], a method for suppressing cross-term interference using a modified LFM signal composed of multiple sub-chirp signals with different chirp rates was implemented. However, when two signals with the same pulse width have different chirp rates, the bandwidth of one signal is wider than that of the other signal.…”

Section: Related Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

“…Several researchers have proposed the use of chirp diversity to generate orthogonal waveforms [9][10][11][12][13][14]. Welstead studied the relationship between the chirp rate and the level of interferences between two LFM signals with the same pulse width and showed that, as the difference of the chirp rates of two LFM waveforms increases, they become less correlated [9]. Focusing on the characteristics of the chirp rate diversity of a single LFM signal, in [9,10], a method for suppressing cross-term interference using a modified LFM signal composed of multiple sub-chirp signals with different chirp rates was implemented.…”

Section: Related Workmentioning

confidence: 99%

“…Like [10], in [11][12][13][14], the authors exploited chirp diversity to generate orthogonal waveforms using a signal composed of several sub-chirps with different chirp rates. Unlike previous studies [9,10], the authors in [11][12][13][14] exploited chirp diversity, but bounded the bandwidth so that all signals had the same bandwidth. In [11], the author developed a waveform consisting of up-chirps and down-chirps within the bounded bandwidth and repeated the waveform within the pulse width.…”

Section: Related Workmentioning

confidence: 99%

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Design of Optimized Coded LFM Waveform for Spectrum Shared Radar System

Kim

Lim

2021

Sensors

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To meet the increasing demands for remote sensing, a number of radar systems using Linear Frequency Modulation (LFM) waveforms have been deployed, causing the problem of depleting frequency resources. To address this problem, several researchers have proposed the Spectrum Shared Radar System (SSRS) in which multiple radars share the same frequency band to transmit and receive their own signals. To mitigate the interferences caused by the signal transmission by other radars, SSRS employs orthogonal waveforms that inherit the orthogonality of the waveforms from orthogonal codes. However, the inherited orthogonality of the codes is significantly reduced when incorporating LFM waveforms with the codes. To solve this problem, in this paper, we propose a novel but simple scheme for generating a set of optimized coded LFM waveforms via new optimization framework. In the optimization framework, we minimize the weighted sum of autocorrelation sidelobe peaks (ASP) and cross-correlation peaks (CP) of the coded LFM waveforms to maximize the orthogonality of the waveforms. Through computer simulations, we show that the waveforms generated by the proposed scheme outperform the waveforms created by previous proposals in terms of ASP and CP.

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Section: Related Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

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Design of Optimized Coded LFM Waveform for Spectrum Shared Radar System

Kim

Lim

2021

Sensors

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“…From a practical point of view, we think that MIMO radar should use chirp-based waveforms. The up-and down-chirp waveforms are used in [28], but there are only two orthogonal waveforms. An OFDM chirp waveform design scheme is proposed in [29], which allows the generated waveforms to occupy common spectral support and thereby enables them to exploit the full bandwidth.…”

mentioning

confidence: 99%

Dual-Function Mimo Radar-Communications Employing Frequency-Hopping Chirp Waveforms

Nusenu¹,

Wang²,

Chen³

2018

PIER M

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A dual-function radar-communication system is a technology equipped with a joint platform that enables performing a radar function (primary function) and a communication function (secondary function) simultaneously. This duality has become increasingly necessary, since it alleviates congestion and ease competition over frequency spectrum. In this paper, we put forward a technique for information embedding, specifically to multiple-input multiple-output (MIMO) radar employing frequency-hopping chirp (FHC) waveforms. We use FHC codes to implement the primary function (i.e., MIMO radar operation), while embedding communication symbol, for example, phase shift keying (PSK), in each FHC code for secondary function (i.e., communication operation). We show that the communication operation does not interfere with the MIMO radar function. In addition, standard ratio testing is used at the communication receiver to detect the embedded PSK symbols. Furthermore, the waveform designed has the superiorities of high range resolution, constant time domain and almost constant frequencydomain modulus, large time-bandwidth product, and low time-delay and frequency-shift correlation peaks. Numerical results show that: 1) data rates can be accurately detected, and thus, several Mbps are achieved in the system; 2) the SER performance characteristics are significantly improved; 3) the orthogonal frequency-hopping chirp waveforms achieve better range and Doppler resolution with reduced sidelobes levels compared to that of conventional frequency hopping waveforms. INTRODUCTIONThe concept of coexistence of radar and communications on a single platform has been proposed as a solution to the radio frequency spectrum congestion and also attracted a lot of attention [1,2]. Since there has been a huge demand from communication operators, the competition between the radar and communication in terms of frequency spectrum could be eased by allowing both systems to share the same resources and operate simultaneously from a single platform [3][4][5][6][7][8][9][10][11][12][13][14][15][16]. This implies that we can achieve an efficient utilization of the limited frequency spectrum resources. Recently, the concept of dual-function radar-communication (DFRC) has been proposed [16]. The main idea about this concept is to utilize identical signals and the same antenna array for both radar (primary function) and communication (secondary function) operations simultaneously. A number of papers [16][17][18][19][20][21][22][23][24][25] have investigated the capabilities of dual-function radar-communication (DFRC) system. DFRC systems utilize the full potential of radar resources, for instance, high quality hardware and high transmit power. Embedding information into the radiation of single-input multiple-output (SIMO) radar can be done by employing the following: 1) waveform diversity, 2) sidelobe control, and 3) time modulated array.Lately, information embedding into the radiation of multiple-input multiple-output (MIMO) radar has been reported in [23][24][...

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Large Time-Bandwidth Product MIMO Radar Waveform Design Based on Chirp Rate Diversity

Wang

2015

IEEE Sensors J.

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Characterization of diversity approaches for LFM stretch-processed waveforms

Cited by 10 publications

References 2 publications

Design of Optimized Coded LFM Waveform for Spectrum Shared Radar System

Design of Optimized Coded LFM Waveform for Spectrum Shared Radar System

Dual-Function Mimo Radar-Communications Employing Frequency-Hopping Chirp Waveforms

Large Time-Bandwidth Product MIMO Radar Waveform Design Based on Chirp Rate Diversity

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