IEEE Military Communications Conference, 2003. MILCOM 2003.最新文献_第3页

Novel design for the broadband linearized optical intensity modulator 宽带线性化光强调制器的新设计

IEEE Military Communications Conference, 2003. MILCOM 2003. Pub Date : 2003-10-13 DOI: 10.1109/MILCOM.2003.1290371

N. Reingand, I. Shpantzer, Y. Achiam, A. Kaplan, A. Greenblatt, G. Harston, P. Cho

{"title":"Novel design for the broadband linearized optical intensity modulator","authors":"N. Reingand, I. Shpantzer, Y. Achiam, A. Kaplan, A. Greenblatt, G. Harston, P. Cho","doi":"10.1109/MILCOM.2003.1290371","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290371","url":null,"abstract":"The field of microwave photonics in which the radio-frequency signal is transmitted using an optical link has been experiencing rapid growth in the last decade. There is a demand for compact, robust and inexpensive devices capable of achieving high fidelity analog transmission between two remote locations. Analog transmission possesses an inherent advantage of being transparent to various modulation formats in many bands. Many applications require large dynamic range (over 130 dB/Hz) and large (few GHz) bandwidth. In such applications the element limiting the performance turns out to be the optical intensity modulator. The typical intensity modulator based on the Mach-Zehnder interferometer (MZI) has a nonlinear response and thus exhibits strong third-order intermodulation distortion limiting the dynamic range. Numerous suggestions for linearization of the MZI response have not become practical due to their complexity of design. We propose a novel, exceptionally simple way of linearization of the intensity modulator response based on combining a MZI and a low-Q off-resonant Gires-Tornois interferometer (GTI) in one integrated package. In this design the third-order intermodulation distortion can be completely cancelled raising the spur-free dynamic range to 130 dB in 1 Hz bandwidth. At the same time, due to the low Q of the GTI a bandwidth in excess of 3 GHz can be attained anywhere in a 0-45 GHz range.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130153009","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: 11

On the use of directional antennas for sensor networks 定向天线在传感器网络中的应用

IEEE Military Communications Conference, 2003. MILCOM 2003. Pub Date : 2003-10-13 DOI: 10.1109/MILCOM.2003.1290184

C. Santivanez, J. Redi

引用次数: 47

Generic protocol for network management data collection and dissemination 用于网络管理数据收集和分发的通用协议

IEEE Military Communications Conference, 2003. MILCOM 2003. Pub Date : 2003-10-13 DOI: 10.1109/MILCOM.2003.1290292

C. Chiang, A. Mcauley, D. Chee, L. Wong

引用次数: 9

OMG data distribution service: architectural overview OMG数据分发服务:体系结构概述

IEEE Military Communications Conference, 2003. MILCOM 2003. Pub Date : 2003-10-13 DOI: 10.1109/MILCOM.2003.1290110

G. Pardo-Castellote

引用次数: 98

Fast DOA estimation algorithm for improving performance of SPT-LCMV beamformer 提高SPT-LCMV波束形成器性能的快速DOA估计算法

IEEE Military Communications Conference, 2003. MILCOM 2003. Pub Date : 2003-10-13 DOI: 10.1109/MILCOM.2003.1290426

Jung-Tae Kim, Sung-Hoon Moon, J. Jo, D. Han, Myeong-Je Cho

{"title":"Fast DOA estimation algorithm for improving performance of SPT-LCMV beamformer","authors":"Jung-Tae Kim, Sung-Hoon Moon, J. Jo, D. Han, Myeong-Je Cho","doi":"10.1109/MILCOM.2003.1290426","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290426","url":null,"abstract":"To eliminate coherent interferences, a conventional split polarity transformation-linearly constrained minimum variance (SPT-LCMV) beamformer uses the SPT matrix to remove any correlation between the desired signal and coherent interferences. After removing the correlation, an LCMV beamforming is applied to obtain the desired signal. However, it needs to estimate direction of arrivals (DOAs) for all coherent interferences. Conventional algorithms to estimate the DOAs of coherent interferences are computationally complexity. Moreover, the performance of the SPT-LCMV beamformer degraded severely as the estimated DOA errors increased. Accordingly, high-order constraints are required to compensate the DOA estimation errors. As a result, the SPT-LCMV beamformer needs many array elements in proportion to the number of the constraints applied to generate the SPT matrix. This paper proposes a DOA estimation algorithm to overcome the disadvantages of the SPT-LCMV beamformer. The proposed algorithm has a significantly reduced computational complexity and can also reduce the number of the high-order constraints compared to the conventional DOA estimation algorithms.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131288296","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

Performance of UWB communications with imperfect channel estimation 不完全信道估计下的超宽带通信性能

IEEE Military Communications Conference, 2003. MILCOM 2003. Pub Date : 2003-10-13 DOI: 10.1109/MILCOM.2003.1290276

J.D. Choi, W. Stark

引用次数: 10

The universality of LDPC codes on wireless channels LDPC码在无线信道中的通用性

IEEE Military Communications Conference, 2003. MILCOM 2003. Pub Date : 2003-10-13 DOI: 10.1109/MILCOM.2003.1290143

C. Jones, A. Matache, T. Tian, J. Villasenor, R. Wesel

引用次数: 28

On the effect of traffic models to the performance of ad hoc network 业务模型对自组网性能的影响

IEEE Military Communications Conference, 2003. MILCOM 2003. Pub Date : 2003-10-13 DOI: 10.1109/MILCOM.2003.1290140

J. Prokkola, L. Leppanen, T. Braysy

引用次数: 12

Investigation of error control properties of orthogonal codes 正交码的误差控制特性研究

IEEE Military Communications Conference, 2003. MILCOM 2003. Pub Date : 2003-10-13 DOI: 10.1109/MILCOM.2003.1290213

S. Faruque

引用次数: 4

Cryptol: high assurance, retargetable crypto development and validation Cryptol:高保证，可重新定位的加密开发和验证

IEEE Military Communications Conference, 2003. MILCOM 2003. Pub Date : 2003-10-13 DOI: 10.1109/MILCOM.2003.1290218

Jeffrey R. Lewis, Galois

引用次数: 50