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Environmentally-shaped colored spreading sequences for robust wireless communications 用于鲁棒无线通信的环境形状彩色扩展序列
2010 International Waveform Diversity and Design Conference Pub Date : 2010-09-30 DOI: 10.1109/WDD.2010.5592346
T. F. Settle, M. Picciolo, J. S. Goldstein
{"title":"Environmentally-shaped colored spreading sequences for robust wireless communications","authors":"T. F. Settle, M. Picciolo, J. S. Goldstein","doi":"10.1109/WDD.2010.5592346","DOIUrl":"https://doi.org/10.1109/WDD.2010.5592346","url":null,"abstract":"Direct Sequence Spread Spectrum modulation is widely used in wireless commercial communication systems for code division multiple-access supporting multiple users simultaneously. The spreading sequences employed are often drawn from a finite set of spreading sequences that are orthogonal or exhibit good cross-correlation properties and therefore mitigate interference caused by simultaneous multiple users, i.e. multi-access interference. However multi-access interference is one of many interference regimes that must be addressed. Often, other external interference sources may have adverse effects on a multi-user wireless system. Traditional spreading codes combat external interference sources through processing gain, however when processing gain is not sufficient unacceptable performance results. The proliferation of software defined radios permit programmatically generated modulation schema and therefore motivate the use of spreading sequences that are environmentally-shaped and robust against additive colored interference sources. We demonstrate improvements in wireless communications performance when comparing environmentally-shaped colored spreading sequences against commonly used pseudo random noise spreading sequences.","PeriodicalId":112343,"journal":{"name":"2010 International Waveform Diversity and Design Conference","volume":"32 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":"130221784","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: 3
Wideband MIMO waveform design for transmit beampattern synthesis 用于发射波束图合成的宽带MIMO波形设计
2010 International Waveform Diversity and Design Conference Pub Date : 2010-09-30 DOI: 10.1109/WDD.2010.5592313
Hao He, P. Stoica, Jian Li
{"title":"Wideband MIMO waveform design for transmit beampattern synthesis","authors":"Hao He, P. Stoica, Jian Li","doi":"10.1109/WDD.2010.5592313","DOIUrl":"https://doi.org/10.1109/WDD.2010.5592313","url":null,"abstract":"The usage of multi-input-multi-output (MIMO) systems such as a MIMO radar allows the array elements to transmit different waveforms freely. This waveform diversity can lead to flexible transmit beampattern synthesis, which is useful in many applications such as radar/sonar and biomedical imaging. In the past literature most attention was paid to receive beampattern design due to the stringent constraints on waveforms in the transmit beampattern case. Recently progress has been made on MIMO transmit beampattern synthesis but mainly only for narrowband signals. In this paper we propose a new approach that can be used to efficiently synthesize MIMO waveforms in order to match a given wideband transmit beampattern, i.e. to match a transmit energy distribution in both space and frequency. The synthesized waveforms satisfy the unit-modulus or low peak-to-average power ratio (PAR) constraints that are highly desirable in practice. Several examples are provided to investigate the performance of the proposed approach.","PeriodicalId":112343,"journal":{"name":"2010 International Waveform Diversity and Design Conference","volume":"7 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":"114328922","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: 3
The metrication of low probability of intercept waveforms 低概率截距波形的度量化
2010 International Waveform Diversity and Design Conference Pub Date : 2010-09-30 DOI: 10.1109/WDD.2010.5592358
C. Fancey, Clive M. Alabaster
{"title":"The metrication of low probability of intercept waveforms","authors":"C. Fancey, Clive M. Alabaster","doi":"10.1109/WDD.2010.5592358","DOIUrl":"https://doi.org/10.1109/WDD.2010.5592358","url":null,"abstract":"In recent years, military radar operators have been concerned that the transmitted radar signals will beacon the presence of the radar to an enemy. If intercepted, the radar signals alert a target to an attack which could prompt evasive measures or countermeasures to be taken by the target including the possibility of a reprisal attack using an antiradiation missile. Furthermore, intercepted signals can divulge operating parameters of the radar to the enemy. In response to this low probability of intercept (LPI) requirement, waveforms have been designed to minimize the probability of intercept by an enemy receiver. These are largely based on the use of low peak powers and spread spectrum waveforms offering large processing gains. The interception of signals is a function of both the transmitted radar waveform and the intercept receiver. The aim of this work is to deduce a metric which may be used to quantify and hence compare how “discrete” many of the commonly used LPI radar waveforms actually are. This study considers the following LPI waveforms [1]: Linear Frequency Modulation (LFM), Sinusoidal Frequency Modulation (Sin FM), PolyPhase Shift Keying (PPSK) techniques including Frank, P1, P2, P3, and P4 codes Costas code Frequency Shift Keying (FSK), and Costas-Barker Hybrid (FSK/PSK). This work represents the first attempt to be published in the open literature to quantify the LPI properties of transmitted radar waveforms. Secure waveform coding strategies to minimize the risk of divulging radar capabilities is known as low probability of exploitation (LPE) and is not considered here.","PeriodicalId":112343,"journal":{"name":"2010 International Waveform Diversity and Design Conference","volume":"1 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":"128705753","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: 25
Analysis of the performance of a multiband passive bistatic radar processing scheme 一种多波段无源双基地雷达处理方案性能分析
2010 International Waveform Diversity and Design Conference Pub Date : 2010-09-30 DOI: 10.1109/WDD.2010.5592397
K. E. Olsen, K. Woodbridge
{"title":"Analysis of the performance of a multiband passive bistatic radar processing scheme","authors":"K. E. Olsen, K. Woodbridge","doi":"10.1109/WDD.2010.5592397","DOIUrl":"https://doi.org/10.1109/WDD.2010.5592397","url":null,"abstract":"The bistatic radar has been revitalized over the last few years through the rapid development of the passive bistatic radar technology. Passive bistatic radar systems have unique properties, especially is time on target high compared to traditional radar systems, as well as the freedom in choosing from the available transmitters of opportunity. This paper will focus on how to take advantage of the latter of these two special properties in order to achieve better range resolution while maintaining the high coherent processing interval.","PeriodicalId":112343,"journal":{"name":"2010 International Waveform Diversity and Design Conference","volume":"34 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":"128918234","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: 27
A reliable frequency lock detection for Software-Defined Radio (SDR) systems 软件定义无线电(SDR)系统的可靠频率锁定检测
2010 International Waveform Diversity and Design Conference Pub Date : 2010-09-30 DOI: 10.1109/WDD.2010.5592361
D. N. Vo
{"title":"A reliable frequency lock detection for Software-Defined Radio (SDR) systems","authors":"D. N. Vo","doi":"10.1109/WDD.2010.5592361","DOIUrl":"https://doi.org/10.1109/WDD.2010.5592361","url":null,"abstract":"This work proposes a new approach on the frequency lock detection suitable for high QAM modulations which are used in many reconfigurable Software-Defined-Radio (SDR) systems. This work contains a reliable mechanism to enable a radio system working under very low signal-to-noise ratio (SNR) environments, with high coding gain scenarios such as TPC, LDPC, etc.","PeriodicalId":112343,"journal":{"name":"2010 International Waveform Diversity and Design Conference","volume":"112 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":"132175955","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: 2
Channel probability ensemble update for multiplatform radar systems 多平台雷达系统的信道概率集合更新
2010 International Waveform Diversity and Design Conference Pub Date : 2010-09-30 DOI: 10.1109/WDD.2010.5592507
R. Romero, C. M. Kenyon, N. Goodman
{"title":"Channel probability ensemble update for multiplatform radar systems","authors":"R. Romero, C. M. Kenyon, N. Goodman","doi":"10.1109/WDD.2010.5592507","DOIUrl":"https://doi.org/10.1109/WDD.2010.5592507","url":null,"abstract":"Cognitive radar (CR) is a recently proposed concept that depicts the radar channel in a probabilistic manner. In a multiplatform or networked radar system, some parameters or dimensions of interest are visible (i.e., resolvable) to one radar and not to others depending on the geometry of the scenario. For a radar with new measurements, Bayesian methods to update the cell ensemble probabilities in the non-visible parameters are needed. Here, we show how the overall probabilistic understanding of the channel can be updated despite the fact that some cells are non-visible or “ambiguous”. Unfortunately, the number of calculations needed to accomplish a full update is exponentially related to the number of cells. As such, we also introduce a technique that reduces the calculations immensely. Finally, we apply both update techniques to a two-platform radar system trying to form a two-dimensional probability ensemble of the channel.","PeriodicalId":112343,"journal":{"name":"2010 International Waveform Diversity and Design Conference","volume":"48 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":"126350179","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: 7
Pareto-optimal radar waveform design 帕累托最优雷达波形设计
2010 International Waveform Diversity and Design Conference Pub Date : 2010-09-30 DOI: 10.1049/IET-RSN.2010.0184
A. De Maio, M. Piezzo, A. Farina, M. Wicks
{"title":"Pareto-optimal radar waveform design","authors":"A. De Maio, M. Piezzo, A. Farina, M. Wicks","doi":"10.1049/IET-RSN.2010.0184","DOIUrl":"https://doi.org/10.1049/IET-RSN.2010.0184","url":null,"abstract":"This paper deals with the problem of Pareto-optimal waveform design in the presence of colored Gaussian noise, under a similarity and an energy constraint. At the design stage, we determine the optimal radar code according to the following criterion: joint constrained maximization of the detection probability and constrained minimization of the Cramer Rao Lower Bound (CRLB) on the Doppler estimation accuracy. This is tantamount to jointly maximizing two quadratic forms under two quadratic constraints, so that the problem can be formulated in terms of a non-convex multi-objective optimization problem. In order to solve it, we resort to the scalarization technique, which reduces the vectorial problem into a scalar one using a Pareto weight defining the relative importance of the two objective functions. At the analysis stage, we assess the performance of the proposed waveform design scheme in terms of detection performance and region of achievable Doppler estimation accuracy. In particular, we analyze the role of the Pareto weight in the optimization process.","PeriodicalId":112343,"journal":{"name":"2010 International Waveform Diversity and Design Conference","volume":"50 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":"121658809","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: 20
Parametric excitation of Josephson oscillator in external resonator at arbitrary coupling 任意耦合下外腔约瑟夫森振子的参量激励
2010 International Waveform Diversity and Design Conference Pub Date : 2010-09-30 DOI: 10.1109/WDD.2010.5592391
V. Pavlovskiy, V. Gubankov, I. Gundareva
{"title":"Parametric excitation of Josephson oscillator in external resonator at arbitrary coupling","authors":"V. Pavlovskiy, V. Gubankov, I. Gundareva","doi":"10.1109/WDD.2010.5592391","DOIUrl":"https://doi.org/10.1109/WDD.2010.5592391","url":null,"abstract":"Josephson oscillators attract a considerable interest as parts of superconducting electronic devices. Numerical simulation of Josephson oscillator in resonator was performed at arbitrary coupling. Parametric excitation is indicated by voltage break at dc IV-curve of Josephson oscillator. A numerical procedure was developed for calculation of static characteristics of the oscillator at any coupling with resonator. The influence of thermal fluctuations of normal electron current on parametric excitation was analyzed. The results obtained can be used in development of electronic devices, based on Josephson oscillators in mm- and sub-mm wavelength spectral range of electromagnetic radiation","PeriodicalId":112343,"journal":{"name":"2010 International Waveform Diversity and Design Conference","volume":"560 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":"117053412","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: 0
Frequency diverse waveforms for compressive radar sensing 用于压缩雷达传感的变频波形
2010 International Waveform Diversity and Design Conference Pub Date : 2010-09-30 DOI: 10.1109/WDD.2010.5592522
Emre Ertin
{"title":"Frequency diverse waveforms for compressive radar sensing","authors":"Emre Ertin","doi":"10.1109/WDD.2010.5592522","DOIUrl":"https://doi.org/10.1109/WDD.2010.5592522","url":null,"abstract":"High range resolution radar systems use wideband frequency modulated waveforms to estimate the spatial distribution of the scatterers in the scene. Estimation of range profiles from backscatter energy is a linear inverse problem. The emerging field of compressive sensing has provided provable performance guarantees and signal recovery algorithms for random sub-sampling of sparse or compressible signals. In this paper a novel compressive sensing strategy for radar is introduced which relies on using waveforms with frequency diversity on transmit and random aliasing on receive, that shifts the burden of the sampling operator from the receiver to the transmitter. The transmitter and receiver structure for compressive sensing is described and the sensing matrix for the proposed compressive sensing strategy is derived for use in compressive sensing recovery algorithms based on sparsity regularized inversion. A preliminary experimental demonstration of the compressive sensing strategy is given through sampling of staggered multifrequency linear FM signals through a single low rate A/D.","PeriodicalId":112343,"journal":{"name":"2010 International Waveform Diversity and Design Conference","volume":"30 14 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":"125285768","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: 12
Mismatched filtering of chaotic codes 混沌码的不匹配滤波
2010 International Waveform Diversity and Design Conference Pub Date : 2010-09-30 DOI: 10.1109/WDD.2010.5592337
R. Nuthalapati
{"title":"Mismatched filtering of chaotic codes","authors":"R. Nuthalapati","doi":"10.1109/WDD.2010.5592337","DOIUrl":"https://doi.org/10.1109/WDD.2010.5592337","url":null,"abstract":"Low Probability of Intercept (LPI) pulse compression waveforms find applications in secure communications. Conventional waveforms with good correlation properties fail to satisfy requirements in presence of unintentional interference. Chaotic pulse compression codes combined with mismatched sidelobe suppression filters are proposed to simultaneously improve LPI performance and meet low sidelobe level requirements of secure communications.","PeriodicalId":112343,"journal":{"name":"2010 International Waveform Diversity and Design Conference","volume":"1 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":"125757297","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: 0
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