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On non-contiguous multicarrier waveforms for spectrally opportunistic cognitive radio systems 频谱机会性认知无线电系统的非连续多载波波形研究
2010 International Waveform Diversity and Design Conference Pub Date : 2010-09-30 DOI: 10.1109/WDD.2010.5592432
S. Pagadarai, Adrian Kliks, H. Bogucka, A. Wyglinski
{"title":"On non-contiguous multicarrier waveforms for spectrally opportunistic cognitive radio systems","authors":"S. Pagadarai, Adrian Kliks, H. Bogucka, A. Wyglinski","doi":"10.1109/WDD.2010.5592432","DOIUrl":"https://doi.org/10.1109/WDD.2010.5592432","url":null,"abstract":"Multicarrier modulation is well suited for future wireless communication systems due to its ability to opportunistically transmit across unoccupied frequency bands. In addition to multicarrier modulation being able to attain high data rates with a sufficient level of error robustness, it also has the potential to achieve transmission flexibility via the non-contiguous access of wireless spectrum. In this paper, we shall investigate two approaches for enabling non-contiguous multicarrier modulation that can be used to facilitate spectrally opportunistic cognitive radio systems. One of the approaches is a variant of orthogonal frequency division multiplexing (OFDM), called non-contiguous OFDM (NC-OFDM), while the other approach is based the noncontiguous version of the filter bank approach non-orthogonal frequency division multiplexing (NOFDM), referred to as noncontiguous NOFDM (NC-NOFDM). The performance of these two approaches is assessed in terms of interference mitigation, which involves the use of actual spectrum measurement data, as well as computational complexity.","PeriodicalId":112343,"journal":{"name":"2010 International Waveform Diversity and Design Conference","volume":"37 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116733457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Cognitive Radio technology for dynamic spectrum access: Spectrum sensing, waveform design and implementation 动态频谱接入的认知无线电技术:频谱感知、波形设计和实现
2010 International Waveform Diversity and Design Conference Pub Date : 2010-09-30 DOI: 10.1109/WDD.2010.5592295
V. Chakravarthy, Zhiqiang Wu
{"title":"Cognitive Radio technology for dynamic spectrum access: Spectrum sensing, waveform design and implementation","authors":"V. Chakravarthy, Zhiqiang Wu","doi":"10.1109/WDD.2010.5592295","DOIUrl":"https://doi.org/10.1109/WDD.2010.5592295","url":null,"abstract":"Spectrum Congestion is a concern to both military and commercial applications. Recent studies have suggested that spectrum congestion is mainly due to the inefficient use of spectrum rather than its unavailability. Dynamic Spectrum Access (DSA) and Cognitive Radio (CR) are two terminologies which are used in the context of improved spectrum efficiency and usage. The advent of CR has created a paradigm shift in wireless communications and instigated a change in FCC policy towards spectrum regulations. Cognitive Radio is a cross-cutting multi disciplinary technology requiring concepts such as: Signal processing, Wireless Communications, Antenna theory, Network protocols, Pattern recognition and Machine learning, to name a few. Even though CR technology's main objective is to identify unused spectrum and improve spectrum efficiency, it indirectly translates to unrealized monetary gain resulting from new applications and users. This has resulted in interest from not only technologists (engineers) but also from policy makers (attorneys) and corporate business.","PeriodicalId":112343,"journal":{"name":"2010 International Waveform Diversity and Design Conference","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114881607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
The impact of internal clutter motion on a sample matrix inversion space-time adaptive processing algorithm and the GMTI minimum detectable velocity 内部杂波运动对样本矩阵反演时空自适应处理算法和GMTI最小可探测速度的影响
2010 International Waveform Diversity and Design Conference Pub Date : 2010-09-30 DOI: 10.1109/WDD.2010.5592406
R. J. Czernik, J. J. Santapietro
{"title":"The impact of internal clutter motion on a sample matrix inversion space-time adaptive processing algorithm and the GMTI minimum detectable velocity","authors":"R. J. Czernik, J. J. Santapietro","doi":"10.1109/WDD.2010.5592406","DOIUrl":"https://doi.org/10.1109/WDD.2010.5592406","url":null,"abstract":"A MATLAB simulation was constructed to better study the effects of internal clutter motion on a notional X band monostatic airborne radar employing a ground moving target indicator (GMTI) algorithm to detect slow velocity targets of low radar cross section. A sample matrix inversion (SMI) fully adapted post-Doppler space-time processor (tapered and untapered) was utilized and the internal clutter motion model of Ward [1] was applied to the overall simulation. As one would expect, the untapered version yielded slightly better results but in all cases final minimum detectable velocities of about 1.0 meter/second were obtained. By judicious choice and implementation of a reduced rank/dimension algorithm, it should be possible to obtain similar MDV results.","PeriodicalId":112343,"journal":{"name":"2010 International Waveform Diversity and Design Conference","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128271722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
ISAR imaging in sea clutter via compressive sensing 基于压缩感知的海杂波ISAR成像
2010 International Waveform Diversity and Design Conference Pub Date : 2010-09-30 DOI: 10.1109/WDD.2010.5592527
R. Raj, M. Farshchian
{"title":"ISAR imaging in sea clutter via compressive sensing","authors":"R. Raj, M. Farshchian","doi":"10.1109/WDD.2010.5592527","DOIUrl":"https://doi.org/10.1109/WDD.2010.5592527","url":null,"abstract":"We investigate the application of compressive sensing (CS) to inverse synthetic aperture radar (ISAR) imaging of moving targets. We present our results for a simulated target immersed in different levels of sea clutter. Comparison between traditional and CS approaches to ISAR imaging reveal that our based CS algorithm offers some advantages compared to traditional ISAR imaging under certain limited operating conditions that are nevertheless of practical interest. We conclude by pointing out directions for future work in extending the results of this paper.","PeriodicalId":112343,"journal":{"name":"2010 International Waveform Diversity and Design Conference","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128275768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 16
Sparse reconstruction methods in RF Tomography for underground imaging 地下成像射频层析成像中的稀疏重建方法
2010 International Waveform Diversity and Design Conference Pub Date : 2010-09-30 DOI: 10.1109/WDD.2010.5592325
L. Monte, J. Parker
{"title":"Sparse reconstruction methods in RF Tomography for underground imaging","authors":"L. Monte, J. Parker","doi":"10.1109/WDD.2010.5592325","DOIUrl":"https://doi.org/10.1109/WDD.2010.5592325","url":null,"abstract":"Underground imaging involving RF Tomography is generally severely ill-posed posed. Tikhonov Regularization is perhaps the most common method to address this ill-posedness. The proposed methods are based upon the realistic assumptions that targets (e.g. tunnels) are sparse and clustered in the scene, and have known electrical properties. Therefore, we explore the use of alternative regularization strategies leveraging sparsity of the signal and its spatial gradient, while also imposing physically-derived amplitude constraints. By leveraging this prior knowledge, cleaner scene reconstructions are obtained.","PeriodicalId":112343,"journal":{"name":"2010 International Waveform Diversity and Design Conference","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134291416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 15
Phase-modulated waveform design for the target detection in the presence of signal-dependent clutter 基于信号相关杂波的目标检测的调相波形设计
2010 International Waveform Diversity and Design Conference Pub Date : 2010-09-30 DOI: 10.1109/WDD.2010.5592373
Tao Mao, Xuhua Gong, H. Meng, Xiqin Wang
{"title":"Phase-modulated waveform design for the target detection in the presence of signal-dependent clutter","authors":"Tao Mao, Xuhua Gong, H. Meng, Xiqin Wang","doi":"10.1109/WDD.2010.5592373","DOIUrl":"https://doi.org/10.1109/WDD.2010.5592373","url":null,"abstract":"The problem to be considered is a phase-modulated waveform design for detection of extended targets contaminated by signal-dependent clutter returns and additive channel noise in practical radar systems. We first introduce an optimal waveform design algorithm for extended target detection in a band-limited radar system by maximizing the signal-to-clutter-and-noise ratio (SCNR) at the output of the receiver, and give the analytical solution of the optimal signal energy spectral density (ESD). In order to make full use of the transmission power, a phase iterative algorithm to design the phase-modulated waveform with constant envelop is proposed, which is proven to be able to achieve a small SCNR loss by minimizing the mean-square spectral distance between the optimal waveform and the designed one. The results of extensive simulations illustrate that our approach provides less than 1 dB SCNR loss when the signal duration is greater than 1 μs.","PeriodicalId":112343,"journal":{"name":"2010 International Waveform Diversity and Design Conference","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131620961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
An adaptive multimodal radar system with progressive resolution enhancement 逐级增强分辨率的自适应多模态雷达系统
2010 International Waveform Diversity and Design Conference Pub Date : 2010-09-30 DOI: 10.1109/WDD.2010.5592382
Surendra S. Bhat, R. Narayanan, M. Rangaswamy
{"title":"An adaptive multimodal radar system with progressive resolution enhancement","authors":"Surendra S. Bhat, R. Narayanan, M. Rangaswamy","doi":"10.1109/WDD.2010.5592382","DOIUrl":"https://doi.org/10.1109/WDD.2010.5592382","url":null,"abstract":"This paper describes the architecture for an adaptive multimodal RF sensor that is capable of both a wide and narrow field of view. The architecture consists of a test-bed that will enable the generation of linear frequency modulation waveforms of various bandwidths. This paper discusses the proposed architecture, multimodal algorithm and simulation results.","PeriodicalId":112343,"journal":{"name":"2010 International Waveform Diversity and Design Conference","volume":"150 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116304844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
An MIMO-MTI approach for through-the-wall radar imaging applications 用于穿墙雷达成像应用的MIMO-MTI方法
2010 International Waveform Diversity and Design Conference Pub Date : 2010-09-30 DOI: 10.1109/WDD.2010.5592466
Xavier Pons Masbernat, M. Amin, F. Ahmad, C. Ioana
{"title":"An MIMO-MTI approach for through-the-wall radar imaging applications","authors":"Xavier Pons Masbernat, M. Amin, F. Ahmad, C. Ioana","doi":"10.1109/WDD.2010.5592466","DOIUrl":"https://doi.org/10.1109/WDD.2010.5592466","url":null,"abstract":"In this paper, we apply Multiple-Input Multiple-Output (MIMO) configurations to Moving Target Identification (MTI) for urban sensing using radars. In particular, we consider MIMO-MTI formulations for detecting slow-moving personnel inside enclosed structures and behind walls. Using signal multiplexing from two transmitters and several receiver positions, it is shown that the virtual array (co-array) implementing MIMO schemes, applied to stepped-frequency radars, permit improvement in image resolution of moving targets. Laboratory experiments are conducted to validate the proposed approach with targets walking behind walls.","PeriodicalId":112343,"journal":{"name":"2010 International Waveform Diversity and Design Conference","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125155938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 38
Biologically inspired coupled beampattern design 生物学启发的耦合波束模式设计
2010 International Waveform Diversity and Design Conference Pub Date : 2010-09-30 DOI: 10.1109/WDD.2010.5592352
M. Akçakaya, A. Nehorai
{"title":"Biologically inspired coupled beampattern design","authors":"M. Akçakaya, A. Nehorai","doi":"10.1109/WDD.2010.5592352","DOIUrl":"https://doi.org/10.1109/WDD.2010.5592352","url":null,"abstract":"Inspired by the female Ormia ochracea's mechanically coupled ears, we propose to design a small-size transmission coupled antenna array with high performance radiation pattern. The mechanical coupling provides the female Ormia with high localization accuracy despite the small distance between its ears compared with the incoming wavelength of the source signal. The mechanical coupling between the Ormia's ears has been modeled by a pair of differential equations. In this paper, after solving these differential equations governing the Ormia ochracea's ear response, we convert the response to the pre-specified radio frequencies. Using the converted response, we then design a biologically inspired uniform linear array composed of finite-length dipole antennas including also the undesired electromagnetic coupling due to the proximity of the elements. In our numerical examples, we compute the radiation intensity of the designed system for binomial and ordinary end-fire arrays to demonstrate the improvement in the half-power beamwidth, sidelobe suppression, and directivity of the radiation pattern due to the biologically inspired coupling.","PeriodicalId":112343,"journal":{"name":"2010 International Waveform Diversity and Design Conference","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126877500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Waveform design for low frequency tomography 低频断层扫描的波形设计
2010 International Waveform Diversity and Design Conference Pub Date : 2010-09-30 DOI: 10.1109/WDD.2010.5592595
D. Sego, H. Griffiths, M. Wicks
{"title":"Waveform design for low frequency tomography","authors":"D. Sego, H. Griffiths, M. Wicks","doi":"10.1109/WDD.2010.5592595","DOIUrl":"https://doi.org/10.1109/WDD.2010.5592595","url":null,"abstract":"There are multiple applications that would benefit from the ability to produce three dimensional, high resolution, imagery collected at low operating frequency; among them remote archeological survey of ruins through foliage, and searching for voids in collapsed structures and underground. High vertical resolution circular SAR requires the use of wide-to-ultra wideband waveforms, a problematic aspect in the modern RF spectral environment, particularly at lower frequencies. RF tomography offers the potential to yield high, 3-dimensional resolution using spectrally sparse, narrowband waveforms simultaneously with operation at frequencies that have demonstrated favorable penetration through intervening dielectric media. In this paper we explore this potential by evaluating minimal spatial support tomographic apertures combining diverse narrowband signals with the form (trajectory) of the monostatic collection aperture. Results are presented in terms of image quality metrics: those frequency combinations that jointly minimize peak and rms voxel sidelobe level, cardinal axis resolution length and voxel volume. It is shown that, generally, the frequency selection is a soft constraint in terms of the achievable resolution and image sidelobe levels; that the tomographic aperture with spatial sampling that is linearly continuous and substantially less than hemispherical yields high spatial resolution, and that there is interaction between the form/shape of the tomographic and the waveform set.","PeriodicalId":112343,"journal":{"name":"2010 International Waveform Diversity and Design Conference","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129449055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
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