2008 42nd Asilomar Conference on Signals, Systems and Computers最新文献

Wavenumber domain focusing of squinted SAR data with a curved orbit geometry 弯曲轨道几何条件下斜视SAR数据的波数域聚焦

2008 42nd Asilomar Conference on Signals, Systems and Computers Pub Date : 2008-12-04 DOI: 10.1109/ACSSC.2008.5074454

T. Michel, S. Hensley

{"title":"Wavenumber domain focusing of squinted SAR data with a curved orbit geometry","authors":"T. Michel, S. Hensley","doi":"10.1109/ACSSC.2008.5074454","DOIUrl":"https://doi.org/10.1109/ACSSC.2008.5074454","url":null,"abstract":"Synthetic Aperture Radar systems provide raw data that need focusing to achieve full-resolution imaging. Current SAR applications, including interferometry, require accurate, phase-preserving, and precisely co-registered coherent images over large ground swaths with the highest achievable resolution. In addition to these challenges, stripmap SAR data may be acquired with an off-broadside (squinted) geometry, either by design or through platform motion. The precise batch focusing of these large aperture and wide bandwidth data sets is known to require a 2D frequency processing approach. The standard wave domain focusing algorithm, however, is only exact for data acquired on a rectilinear trajectory. We investigate a generalization of the standard omega-k focusing formulation that allows curved data acquisition tracks. The new formulation can be used in conjunction with a known extension for conical, squinted imaging grids. The approximations necessary to allow the generalized geometry are analysed to determines the range of applicability of the proposed algorithm. The theory is validated using data simulated with parameters similar to the UAVSAR L-band SAR system.","PeriodicalId":416114,"journal":{"name":"2008 42nd Asilomar Conference on Signals, Systems and Computers","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116280075","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

End-to-end antenna selection strategies for multi-hop relay channels 多跳中继信道的端到端天线选择策略

2008 42nd Asilomar Conference on Signals, Systems and Computers Pub Date : 2008-12-01 DOI: 10.1109/ACSSC.2008.5074672

R. Vaze, R. Heath

引用次数: 1

Inter-cell relay cooperation in heterogeneous cellular uplink systems 异构小区上行系统中的小区间中继合作

2008 42nd Asilomar Conference on Signals, Systems and Computers Pub Date : 2008-12-01 DOI: 10.1109/ACSSC.2008.5074659

H. Ganapathy, J. Andrews, C. Caramanis

{"title":"Inter-cell relay cooperation in heterogeneous cellular uplink systems","authors":"H. Ganapathy, J. Andrews, C. Caramanis","doi":"10.1109/ACSSC.2008.5074659","DOIUrl":"https://doi.org/10.1109/ACSSC.2008.5074659","url":null,"abstract":"Consider a multi-cell relay-assisted time-division uplink system, i.e. one active user per time slot per cell with a relay serving that user. In this paper, we are concerned with heterogeneous networks (networks with unbalanced spatial loads) and we are interested in techniques for increasing the data rate in a congested cell. We propose inter-cell relay cooperation with single-cell decoding as one such solution. In this technique, relays of different cells cooperate to determine optimum precoding weights, but the base stations do not communicate. We compare this strategy to another technique of current interest: base station cooperation through multi-cell decoding, where each cell has a single relay that amplifies and forwards the desired transmission to the base station, and all the base stations cooperatively decode the signals received at each. There will be distinct architectural and implementation consequences for each approach, and inter-cell relay cooperation with single-cell decoding may require less overhead and expense than base station cooperation through multi-cell decoding. Despite this, we see that in some likely channel and interference scenarios, the former actually outperforms the latter. The key contribution of this paper is to propose inter-cell relay cooperation as a promising technology for increasing data rates in heterogeneous cellular uplink networks.","PeriodicalId":416114,"journal":{"name":"2008 42nd Asilomar Conference on Signals, Systems and Computers","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132800421","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

An automated three-dimensional visualization and classification of emphysema using neural network 基于神经网络的肺气肿自动三维可视化与分类

2008 42nd Asilomar Conference on Signals, Systems and Computers Pub Date : 2008-12-01 DOI: 10.1109/ACSSC.2008.5074767

T. K. Liang, Toshiyuki Tanaka, Hidetoshi Nakamura, T. Shirahata, H. Sugiura

{"title":"An automated three-dimensional visualization and classification of emphysema using neural network","authors":"T. K. Liang, Toshiyuki Tanaka, Hidetoshi Nakamura, T. Shirahata, H. Sugiura","doi":"10.1109/ACSSC.2008.5074767","DOIUrl":"https://doi.org/10.1109/ACSSC.2008.5074767","url":null,"abstract":"Chronic obstructive pulmonary disease (COPD) is a disease in which the airways and tiny air sacs (alveoli) inside the lungs are partially obstructed or destroyed. Emphysema is what occurs as more and more of the walls between air sacs get destroyed. Computed tomography (CT) image has been a useful modality for assessing diffuse lung diseases, particularly, emphysema. At present, diagnosis of emphysema is done by using spirometry, X-rays, spiral chest computed tomography (CT)-scan, bronchoscopy, blood tests and pulse oximetry. In this study, we extracted the two-dimensional emphysematous lung tissues in the lung CT automatically using digital image processing techniques, then we visualized the extracted emphysematous lung tissues by implementing a three-dimensional (3D) lung model which was computed using 55 pre-processed CT images, and finally we divided the lung model into eight sub-volumes and classified each sub-volume into five classes of emphysema related severity using an artificial neural network. The performance of the classifier was assessed using the leave-one-out method on 120 sub-volumes of the lungs generated from 15 COPD-verified patients' CT data sets.","PeriodicalId":416114,"journal":{"name":"2008 42nd Asilomar Conference on Signals, Systems and Computers","volume":"517 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122420589","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

Analysis of voltage overscaled computer arithmetics in low power signal processing systems 低功率信号处理系统中电压过尺度计算机算法分析

2008 42nd Asilomar Conference on Signals, Systems and Computers Pub Date : 2008-12-01 DOI: 10.1109/ACSSC.2008.5074802

Yang Liu, Tong Zhang, K. Parhi

引用次数: 6

Distributed MIMO radar using compressive sampling 采用压缩采样的分布式MIMO雷达

2008 42nd Asilomar Conference on Signals, Systems and Computers Pub Date : 2008-12-01 DOI: 10.1109/ACSSC.2008.5074392

A. Petropulu, Yaojiang Yu, H. Poor

引用次数: 35

High-speed implementation of Smith-Waterman algorithm for DNA sequence scanning in VLSI DNA序列扫描的Smith-Waterman算法在VLSI中的高速实现

2008 42nd Asilomar Conference on Signals, Systems and Computers Pub Date : 2008-12-01 DOI: 10.1109/ACSSC.2008.5074677

Chao Cheng, K. Parhi

引用次数: 1

Distributed demodulation using consensus averaging in wireless sensor networks 基于共识平均的无线传感器网络分布式解调

2008 42nd Asilomar Conference on Signals, Systems and Computers Pub Date : 2008-12-01 DOI: 10.1109/ACSSC.2008.5074599

Hao Zhu, A. Cano, G. Giannakis

{"title":"Distributed demodulation using consensus averaging in wireless sensor networks","authors":"Hao Zhu, A. Cano, G. Giannakis","doi":"10.1109/ACSSC.2008.5074599","DOIUrl":"https://doi.org/10.1109/ACSSC.2008.5074599","url":null,"abstract":"This paper deals with demodulation of space-time transmissions from a multi-antenna access point to a network of spatially distributed wireless sensors. Distributed demodulation algorithms are developed by achieving network-wide consensus on the average of (cross-) covariances of locally available per sensor received data vectors with the channel matrix, which constitute sufficient statistics for maximum likelihood demodulation. By reaching consensus on such average terms, each sensor can attain demodulation performance as if all the information was available at a centralized unit. Different from existing distributed hypotheses testing schemes whose complexity grows exponentially with the problem dimension, the novel consensus-based demodulator incurs quadratic complexity. Inter-sensor link imperfections due to additive noise and random link failures are also accounted for. Consensus in these cases is achieved in the mean sense with bounded variance, and in the mean-square error sense, respectively. Simulated tests verify the analytical claims. Interestingly, only a few consensus iterations suffice for the novel distributed demodulator to approach the performance of its centralized benchmark.","PeriodicalId":416114,"journal":{"name":"2008 42nd Asilomar Conference on Signals, Systems and Computers","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126135245","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

A Nyquist folding analog-to-information receiver 奈奎斯特折叠式模拟信息接收器

2008 42nd Asilomar Conference on Signals, Systems and Computers Pub Date : 2008-12-01 DOI: 10.1109/ACSSC.2008.5074464

G. Fudge, Ross E. Bland, M. Chivers, Sujit Ravindran, J. Haupt, Phillip E. Pace

引用次数: 73

A closer look at the physical and protocol models for wireless ad hoc networks with multi-packet reception 详细介绍具有多包接收功能的无线自组织网络的物理和协议模型

2008 42nd Asilomar Conference on Signals, Systems and Computers Pub Date : 2008-10-26 DOI: 10.1109/ACSSC.2008.5074538

Hyunchul Kim, H. Sadjadpour, J. Garcia-Luna-Aceves

引用次数: 4