MILCOM 2002. Proceedings最新文献_第6页

Triangular modulation technique for digital data transmission 数字数据传输的三角调制技术

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1179670

S. Monaco

{"title":"Triangular modulation technique for digital data transmission","authors":"S. Monaco","doi":"10.1109/MILCOM.2002.1179670","DOIUrl":"https://doi.org/10.1109/MILCOM.2002.1179670","url":null,"abstract":"This paper presents a novel technique for digital data modulation and demodulation called triangular modulation (TM). The modulation technique was developed primarily to maximize the amount of data sent over a limited bandwidth channel while still maintaining very good noise rejection and signal distortion performance. The modulation technique involves breaking digital data into a series of parallel words. Each word is then represented by one half period of a triangular waveform whose slope is proportional to the value of the parallel word it represents. The demodulation technique for this uniquely defined waveform involves first digitizing the waveform at a higher constant sampling rate. A linear regression algorithm using the method of least squares is then used to compute the slope of the digitized waveform to a very high precision. This process is repeated for each rising and falling edge of the triangular modulated waveform. All encoded data is extracted by precise slope computation since each slope uniquely defines the encoded data word it represents. The ability of the demodulation algorithm to compute the exact slope of the modulated waveform determines how many bits can be represented by the modulated waveform. Transmission channel bandwidth limitations determine the allowable range of slopes used. Several simulations are performed to provide a sample of how the modulation method will perform in various real world environments. The paper also discusses several application areas where the modulation technique will provide superior results over other modulation methods.","PeriodicalId":191931,"journal":{"name":"MILCOM 2002. Proceedings","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122712033","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

Distance ADaptive (DAD) broadcasting for ad hoc networks 用于自组织网络的距离自适应广播

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1179590

Xiaohu Chen, M. Faloutsos, S. Krishnamurthy

引用次数: 24

RISE: reducing interference and saving energy through multicasting in ad hoc wireless networks RISE:在自组织无线网络中通过多播减少干扰和节约能源

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1179581

K. Wang, C. Chiasserini, J. Proakis, R. Rao

引用次数: 4

Turbo-detected coded continuous-phase modulation for military UHF satellite communications 军用超高频卫星通信用涡轮探测编码连续相位调制

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1180430

T. L. Tapp, R. Mickelson, R. A. Groshong, C. Behmlander, J. T. Graf, J. Whited

引用次数: 9

Bandlimited covert data communications using zinc waveforms 使用锌波形的带宽限制隐蔽数据通信

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1179615

M.S. Nowak, J. LoCicero, D. Ucci

引用次数: 1

Analysis of ground segment broadcast architectures for the Wideband Gapfiller Satellite (WGS) 宽带补隙卫星(WGS)地面段广播体系分析

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1179689

R.A. Williams, H. Paul

{"title":"Analysis of ground segment broadcast architectures for the Wideband Gapfiller Satellite (WGS)","authors":"R.A. Williams, H. Paul","doi":"10.1109/MILCOM.2002.1179689","DOIUrl":"https://doi.org/10.1109/MILCOM.2002.1179689","url":null,"abstract":"The purpose of this paper is to summarize the findings of an assessment tasked by the joint staff regarding the broadcast ground segment architecture for the Wideband Gapfiller Satellite (WGS). WGS has the capability to permit Global Broadcast Service (GBS) injection at either Ka-band (30 GHz) or X-band (8-GHz), and be cross-banded and received by current GBS receive-only suites at 20-GHz. Original plans were to buy three new GBS Ka-band injection terminals to support GBS on WGS; however, to save costs, one alternative is to use existing DSCS X-band terminals to perform the GBS injection on WGS with crossbanding to the current Ka-band GBS receive suites. Then, as UHF Follow-On (UFO) GBS satellites reach their end of life, the existing Ka-band GBS injection terminals will replace the X-band injection, freeing the latter for other missions. This paper examines various options and provides recommendations for GBS injection on WGS in consideration of the available Xand Ka-band bandwidth and the corresponding antenna coverage issues. This paper also discusses an option for GBS reception at X-band for sites with existing X-band two-way services. Based on this capability, the paper shows options for a Ka-only GBS, cross-banded Ka-to-X band GBS, X-to-Ka-band GBS, and X-to-X-band GBS. Planned use of these options will provide coverage flexibility and ease the current planning burden and will minimize the amount of beam movement to achieve desired worldwide coverage goals.","PeriodicalId":191931,"journal":{"name":"MILCOM 2002. Proceedings","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134252491","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

A novel scaleable architecture for intrusion detection and mitigation in switched networks 一种用于交换网络中入侵检测和缓解的新型可扩展架构

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1180474

E. L. Witzke, T. Tarman, S. Ghosh, G. Woodard

{"title":"A novel scaleable architecture for intrusion detection and mitigation in switched networks","authors":"E. L. Witzke, T. Tarman, S. Ghosh, G. Woodard","doi":"10.1109/MILCOM.2002.1180474","DOIUrl":"https://doi.org/10.1109/MILCOM.2002.1180474","url":null,"abstract":"High-speed, switched networks present scalability challenges to a network intrusion detection system, both in terms of the volume of data that must be analyzed, and the extent to which sensors must be inserted into the switched network to achieve comprehensive visibility. An architecture that uses a single point for intrusion assessment would quickly become overwhelmed with incoming event data from intrusion sensors that are deployed on even a moderate number of high-speed links. This is particularly true if an earnest attack (generating many events in a short period of time) is underway. The authors propose a novel architecture that hierarchically distributes the assessment function into two assessment categories - tactical assessment, and strategic assessment. The tactical assessment function provides low-level event correlation and decision making for a small sub-network (e.g., a department LAN, an ATM switch peer group, etc.), and is capable of providing fast, real-time response when millisecond response times are required due to network attacks. The strategic assessment function, on the other hand, implements high-level event correlation, which is useful when a larger view of the network is required (e.g., for low intensity or distributed attacks). The tactical assessment engines interface to the strategic assessment engine by, filtering and summarizing low-level events, ensuring that the strategic assessment engine's workload remains manageable. This paper describes the distributed intrusion assessment architecture in more detail, presents a few application scenarios that benefit from hierarchical attack assessment, and summarizes ongoing work in developing prototype components for this architecture.","PeriodicalId":191931,"journal":{"name":"MILCOM 2002. Proceedings","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134590965","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

OFDM transmitter power amplifier and PAR reduction performance: measurement and simulation OFDM发射机功率放大器和PAR降低性能:测量与仿真

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1180510

S. Gifford, J. Kleider, S. Chuprun

{"title":"OFDM transmitter power amplifier and PAR reduction performance: measurement and simulation","authors":"S. Gifford, J. Kleider, S. Chuprun","doi":"10.1109/MILCOM.2002.1180510","DOIUrl":"https://doi.org/10.1109/MILCOM.2002.1180510","url":null,"abstract":"Orthogonal frequency division multiplexing (OFDM) is known to exhibit high peak-to-average power ratio (PAR), which may limit the average transmitted power output from a nonlinear power amplifier (PA). We evaluate spectral regrowth and bit-error-rate (BER) performance characteristics when applying OFDM PAR reduction techniques, while integrated to a fixed output level \"class A\" transmit amplifier. Any potential degradation resulting from the transmitter baseband-to-IF conversion and PA, and the receiver IF-to-baseband conversion, is represented. Through proper modeling of the transmitter PA characteristics, and the transmitter-receiver conversion processes, the transmitted spectrum can be predicted using simulation with remarkable agreement to actual measurements. The complete software defined radio transceiver model demonstrates the expected BER degradations at various PA input backoff operating points. A promising solution to increase the average transmitted power using PAR reduction based on Tellado's method (Tellado, J. and Cioffi, J.M., ANSI Document T1E1.4, Technical Subcommittee no.97-367, 98-083; ITU, Q4/15, no.D-150; Proc. IEEE Int. Symp. on Inf. Theory, p.191, 1998) is presented. A 2.1 dB improvement in input back off (IBO) of the PA is demonstrated.","PeriodicalId":191931,"journal":{"name":"MILCOM 2002. Proceedings","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114152797","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

IP roaming over cellular digital video broadcast networks 在蜂窝数字视频广播网络上的IP漫游

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1180486

R. Segura

引用次数: 0

A low complexity blind space-time multiuser detector for multipath fading channel in DS/CDMA systems 一种适用于DS/CDMA系统多径衰落信道的低复杂度盲空多用户检测器

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1179667

Tae-Sung Kang, Hyung-Myung Kim

引用次数: 0