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2012 International Waveform Diversity & Design Conference (WDD)最新文献

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Doppler correction for digital modulation in a fading channel with SISO 衰落信道中SISO数字调制的多普勒校正
2012 International Waveform Diversity & Design Conference (WDD) Pub Date : 1900-01-01 DOI: 10.1109/WDD.2012.7311270
Gabriel Tham Chi Mun, Weilian Su, T. Ha, Jeffrey A. Smith, C. Robertson
{"title":"Doppler correction for digital modulation in a fading channel with SISO","authors":"Gabriel Tham Chi Mun, Weilian Su, T. Ha, Jeffrey A. Smith, C. Robertson","doi":"10.1109/WDD.2012.7311270","DOIUrl":"https://doi.org/10.1109/WDD.2012.7311270","url":null,"abstract":"In a high mobility wireless channel, the Doppler effect is compounded and must be corrected by using pilot-aided symbols. The pilot symbol rate depends on the severity of the Doppler effect. There are existing algorithms such as differential decision-feedback (D-DF) and double-differential decision-feedback (DD-DF) for single-input single-output (SISO) systems to improve channel tap estimation. Such algorithms improve the bit error rate (BER) performance of pilot symbol aided decision feedback demodulation. In this paper, minimum mean square error (MMSE) estimation was implemented to further improve the channel tap estimation for the D-DF and DD-DF algorithms. BER performance showed significant improvement for higher order modulation schemes. On the other hand, implementation of the new algorithm on quadrature phase-shift keying (QPSK) showed negligible improvement.","PeriodicalId":102625,"journal":{"name":"2012 International Waveform Diversity & Design Conference (WDD)","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128840773","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 array radar receiver architectures 变频阵列雷达接收机结构
2012 International Waveform Diversity & Design Conference (WDD) Pub Date : 1900-01-01 DOI: 10.1109/WDD.2012.7311296
Aaron M. Jones, B. Rigling
{"title":"Frequency diverse array radar receiver architectures","authors":"Aaron M. Jones, B. Rigling","doi":"10.1109/WDD.2012.7311296","DOIUrl":"https://doi.org/10.1109/WDD.2012.7311296","url":null,"abstract":"Frequency diverse array radar utilizes the principle of superposition to cohere energy, in a novel fashion, to achieve range dependent spatial patterns. While the theory for transmit spatial patterns has been developed, the need for efficient receiver design architectures persists. This paper investigates three basic receive chain architectures for their spatial patterns and design complexity in a benign environment with a single point target. Additionally, we provide a closed-form expression of a receive pattern for a full-band, coherent frequency diverse array architecture.","PeriodicalId":102625,"journal":{"name":"2012 International Waveform Diversity & Design Conference (WDD)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117220045","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
Accelerated DSP functions on the CBE for the X-Midas Toolkit X-Midas Toolkit的CBE上的加速DSP功能
2012 International Waveform Diversity & Design Conference (WDD) Pub Date : 1900-01-01 DOI: 10.1109/WDD.2012.7311269
Joseph Jezak, C. Berdanier, S. Levitan, D. Chiarulli
{"title":"Accelerated DSP functions on the CBE for the X-Midas Toolkit","authors":"Joseph Jezak, C. Berdanier, S. Levitan, D. Chiarulli","doi":"10.1109/WDD.2012.7311269","DOIUrl":"https://doi.org/10.1109/WDD.2012.7311269","url":null,"abstract":"We characterize the impact of the Cell Broadband Engine architecture, on commonly used radar DSP algorithms. We use the capabilities of the CBE to accelerate several key computational kernels including Matrix Multiplication, Matrix Inversion, and the Finite Impulse Response (FIR) filter. These algorithms are implemented and benchmarked as library routines within the X-Midas Toolkit. We observe speedups as large as 1200x for complex matrix multiplication, but speedups of 40x to 60x are more typical. We find that system I/O overhead within the X-Midas toolkit severely limited the performance of the applications.","PeriodicalId":102625,"journal":{"name":"2012 International Waveform Diversity & Design Conference (WDD)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114824385","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
Metacognition for waveform diverse radar 不同波形雷达的元认知
2012 International Waveform Diversity & Design Conference (WDD) Pub Date : 1900-01-01 DOI: 10.1109/WDD.2012.7311302
G. Capraro, M. Wicks
{"title":"Metacognition for waveform diverse radar","authors":"G. Capraro, M. Wicks","doi":"10.1109/WDD.2012.7311302","DOIUrl":"https://doi.org/10.1109/WDD.2012.7311302","url":null,"abstract":"An airborne ground looking radar sensor's performance may be enhanced by selecting algorithms adaptively as the environment changes. A short description of an airborne intelligent radar system (AIRS) is presented with a description of the knowledge based filter and detection portions. A second level of artificial intelligence (AI) processing is presented that monitors, tests, and learns how to improve and control the first level. This approach is based upon metacognition.","PeriodicalId":102625,"journal":{"name":"2012 International Waveform Diversity & Design Conference (WDD)","volume":"289 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124161389","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: 9
Multiple mode track-before-detect for multiple targets 针对多目标的多模式检测前跟踪
2012 International Waveform Diversity & Design Conference (WDD) Pub Date : 1900-01-01 DOI: 10.1109/WDD.2012.7311273
S. P. Ebenezer, A. Papandreou-Suppappola
{"title":"Multiple mode track-before-detect for multiple targets","authors":"S. P. Ebenezer, A. Papandreou-Suppappola","doi":"10.1109/WDD.2012.7311273","DOIUrl":"https://doi.org/10.1109/WDD.2012.7311273","url":null,"abstract":"The track-before-detect (TBD) approach can be used to track a single target in a highly noisy radar scene. This is because it makes use of unthresholded observations and incorporates a binary target existence variable into its target state estimation process when implemented as a particle filter (PF). The PF-TBD has been extended to track two targets but only for the special case of the second target spawning from the first target. This paper proposes the extension of the recursive PF-TBD approach to detect multiple targets in low signal-to-noise ratios (SNRs). The new algorithm estimates the joint posterior probability density of all the target trajectories while keeping track of targets entering and leaving the noisy radar scene under observation using multiple modes. The algorithm's successful performance is demonstrated using a simulated three-target example.","PeriodicalId":102625,"journal":{"name":"2012 International Waveform Diversity & Design Conference (WDD)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121726129","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
Approximating the power spectral density of frequency hopping spread spectrum signals 近似跳频扩频信号的功率谱密度
2012 International Waveform Diversity & Design Conference (WDD) Pub Date : 1900-01-01 DOI: 10.1109/WDD.2012.7311309
I. Demirkiran, D. Weiner, A. Drozd, I. Kasperovich
{"title":"Approximating the power spectral density of frequency hopping spread spectrum signals","authors":"I. Demirkiran, D. Weiner, A. Drozd, I. Kasperovich","doi":"10.1109/WDD.2012.7311309","DOIUrl":"https://doi.org/10.1109/WDD.2012.7311309","url":null,"abstract":"This paper discusses the results of exploratory research and development to apply and demonstrate heuristics, an approach for analyzing the electromagnetic compatibility (EMC) of co-located radio frequency (RF) spread spectrum frequency hopping transceivers mounted on an unmanned airborne vehicle (UAV) platform. In the paper, approximation on the Power Spectral Density (PSD) of frequency hopping signals is developed to simplify EMC analysis for the transceivers employing frequency hopping spread spectrum frequency technique.","PeriodicalId":102625,"journal":{"name":"2012 International Waveform Diversity & Design Conference (WDD)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125649401","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
Spectrum shaping challenges in dynamic spectrum access networks with transmission hyperspace 具有传输超空间的动态频谱接入网络中的频谱整形挑战
2012 International Waveform Diversity & Design Conference (WDD) Pub Date : 1900-01-01 DOI: 10.1109/WDD.2012.7311266
O. Ozdemir, E. Masazade, C. Mohan, P. Varshney, I. Kasperovich, R. Loe, A. Drozd, S. Reichhart
{"title":"Spectrum shaping challenges in dynamic spectrum access networks with transmission hyperspace","authors":"O. Ozdemir, E. Masazade, C. Mohan, P. Varshney, I. Kasperovich, R. Loe, A. Drozd, S. Reichhart","doi":"10.1109/WDD.2012.7311266","DOIUrl":"https://doi.org/10.1109/WDD.2012.7311266","url":null,"abstract":"Our goal in this paper is to discuss several issues and challenges involved with dynamic spectrum access in cognitive radio networks (CRNs). In this context, we introduce three optimization problems for spectrum shaping in cognitive radio networks (CRNs) using orthogonal frequency division multiplexing (OFDM). These optimization problems utilize the concept of transmission hyperspace (TH). The first problem involves maximization of sum-rate of the network under primary and secondary quality-of-service (QoS) constraints utilizing frequency and space dimensions of the TH. The second problem relaxes the omnidirectional assumption and incorporates antenna directionality in the first problem. As for the third problem, time dimension of the TH is added to the first two problems and the resulting problem is formulated as a time scheduling problem. We show that all these problems are NP-hard which requires the development of efficient heuristic algorithms.","PeriodicalId":102625,"journal":{"name":"2012 International Waveform Diversity & Design Conference (WDD)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130503945","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
Multiuser chaos communication through polyphase spreading for overlay cognitive radio 基于多相扩频的叠加认知无线电多用户混沌通信
2012 International Waveform Diversity & Design Conference (WDD) Pub Date : 1900-01-01 DOI: 10.1109/WDD.2012.7311271
Daniel Y. Sundersingh, Yao Ma, Vasu Chakarvarthy, Zhiqiang Wu
{"title":"Multiuser chaos communication through polyphase spreading for overlay cognitive radio","authors":"Daniel Y. Sundersingh, Yao Ma, Vasu Chakarvarthy, Zhiqiang Wu","doi":"10.1109/WDD.2012.7311271","DOIUrl":"https://doi.org/10.1109/WDD.2012.7311271","url":null,"abstract":"Chaos communication systems have received strong interest due to its performance and security advantages such as robustness in multi-path fading environments, resistance to jamming, and low probability of interception. With recent advances in cognitive radio, it is highly desired to combine the security advantages of chaos communication with the flexibility of cognitive radio to create a chaos based cognitive radio communication system that improves the spectrum usage while maintaining high security features. In this paper, we propose a multi-user non-continuous orthogonal frequency division multiplexing (NC-OFDM) based chaotic communication system employing orthogonal polyphase spreading codes. Specifically, a polyphase spreading code called carrier interferometry code is layered onto the frequency domain chaotic waveform to create multi-user support. The proposed system not only maintains the capability of operating over multiple non-contiguous spectrum holes, but also offers security features by chaos sequence modulation. For comparison purposes, we develop two benchmark schemes using both NC-OFDM and chaos modulation. Simulation results show significant performance advantage of the proposed scheme than the benchmark schemes. Finally, we point out that the proposed scheme allows flexible access control for different users and groups, in broadcast, multicast and unicast services.","PeriodicalId":102625,"journal":{"name":"2012 International Waveform Diversity & Design Conference (WDD)","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130883430","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
Waveform diversity for closed-loop wide-band cognitive sensing system 闭环宽带认知传感系统的波形分集
2012 International Waveform Diversity & Design Conference (WDD) Pub Date : 1900-01-01 DOI: 10.1109/WDD.2012.7311304
Xia Li, Zhen Hu, R. Qiu, T. Guo, G. Scalzi, M. Wicks
{"title":"Waveform diversity for closed-loop wide-band cognitive sensing system","authors":"Xia Li, Zhen Hu, R. Qiu, T. Guo, G. Scalzi, M. Wicks","doi":"10.1109/WDD.2012.7311304","DOIUrl":"https://doi.org/10.1109/WDD.2012.7311304","url":null,"abstract":"This paper presents the architecture and initial measured performance of a closed-loop multi-input multi-output (MIMO) wide-band cognitive sensing system. A cognitive sensing system is one kind of cyber-physical systems that integrate the computational and physical resources for application driven tasks. In this system, computational resources dwell in the computing engine that controls the closed-loop cognitive sensing system and involves intensive computations for potential algorithms. Through this way, the transmitted waveform can be dynamically changed in response to the environment, target in the scene, and the sensing task requirement. In this paper, a real-time cognitive sensing system is first time demonstrated. The feasibility and design methodology of the system are provided. A 2 by 2 MIMO testbed with 500 MHz bandwidth, 4 GHz carrier frequency is proposed in this paper to demonstrate a bi-static radar application. The results obtained from actual experiment encourage us to explore further based on our testbed.","PeriodicalId":102625,"journal":{"name":"2012 International Waveform Diversity & Design Conference (WDD)","volume":"479 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131999495","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: 5
Joint MTI and ISAR RADAR for intelligent transport system 联合MTI和ISAR雷达用于智能交通系统
2012 International Waveform Diversity & Design Conference (WDD) Pub Date : 1900-01-01 DOI: 10.1109/WDD.2012.7311285
R. Bera, S. Sur, D. Bhaskar, S. Bera
{"title":"Joint MTI and ISAR RADAR for intelligent transport system","authors":"R. Bera, S. Sur, D. Bhaskar, S. Bera","doi":"10.1109/WDD.2012.7311285","DOIUrl":"https://doi.org/10.1109/WDD.2012.7311285","url":null,"abstract":"Research works are initiated worldwide towards the development of Software defined radar (SDR) system operating jointly to change radar modes from Inverse synthetic aperture RADAR (ISAR) imaging to moving target indication (MTI), or adapt its waveform based on environmental conditions and/or information derived from previous RADAR interrogations. These adaptations can be performed manually or they may be automated through software. In the later case the system becomes cognitive RADAR. In this paper, we designed a joint moving target indication (MTI) and Inverse synthetic aperture RADAR (ISAR) RADAR system for intelligent transport system (ITS). We have processed the vehicular target return data using MTI to extract the velocity and also through the ISAR processing to have the location and type of vehicle information through ISAR imaging.","PeriodicalId":102625,"journal":{"name":"2012 International Waveform Diversity & Design Conference (WDD)","volume":"35 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116378947","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
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