MILCOM 2002. Proceedings最新文献_第9页

Low power method for demodulation of continuous phase modulated (CPM) waveforms 连续相位调制(CPM)波形的低功率解调方法

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1179613

J. Norris

引用次数: 0

Performance of serial, matched-filter acquisition with adaptive thresholds in direct-sequence packet communications 直接序列分组通信中具有自适应阈值的串行匹配滤波采集性能

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1179611

A. Swaminathan, D. Noneaker

引用次数: 1

Improved transmit diversity using space-time block coding for OFDM systems 利用空时分组编码改进OFDM系统的发射分集

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1179618

Eunseok Ko, Pan-Yuh Joo, C. Kang, D. Hong

引用次数: 6

A physical model for wireless channels to provide insights for long range prediction 无线信道的物理模型，为长期预测提供见解

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1180517

H. Hallen, A. Duel-Hallen, Shengquan Hu, Tung-Shen Yang, M. Lei

{"title":"A physical model for wireless channels to provide insights for long range prediction","authors":"H. Hallen, A. Duel-Hallen, Shengquan Hu, Tung-Shen Yang, M. Lei","doi":"10.1109/MILCOM.2002.1180517","DOIUrl":"https://doi.org/10.1109/MILCOM.2002.1180517","url":null,"abstract":"Algorithms that predict the wireless channel for up to a few wavelengths cannot be adequately tested with stationary models. Ray-tracing or FDTD methods do not provide insights into the relationship between reflector configurations and the performance of long-range prediction. Therefore, we present a novel model that: (1) creates non-stationary datasets to test our previously proposed adaptive long range prediction algorithm, which enables practical realization of adaptive transmission techniques; (2) classifies the reflector geometries that have typical or most severe parameter variations, so that the reflector configurations for test datasets can be appropriately chosen; (3) provides limits on the speed of adaptation needed for an algorithm to predict the channel significantly into the future, and thereby reveal the timing of future deep fades, etc.; (4) illuminates the origins of the temporal and statistical properties of measured data. The algorithm performs similarly on channels given by the physical model or actual measured data, but differently on a channel simulated by the stationary Jakes model. The insights of the model accurately describe the performance of the algorithm in several scattering environments when prediction is employed with adaptive power control and adaptive modulation. Moreover, we study limits of the long-range prediction at frequencies other than the observed frequency, of importance in correlated uplink and downlink transmission, orthogonal frequency division multiplexing (OFDM) and frequency-hopping systems.","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":"128609709","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: 38

An overall channel model for the mobile user objective system including ionospheric scintillation and terrestrial multipath 包含电离层闪烁和地面多径的移动用户目标系统整体信道模型

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1180463

M. Keskinen, P. Kullstam

引用次数: 1

Hierarchical admission control scheme for supporting mobility in mobile IP 支持移动IP可移动性的分级准入控制方案

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1180481

Ki-Il Kim, Sang-Ha Kim, J. Moon, Y. Kim

{"title":"Hierarchical admission control scheme for supporting mobility in mobile IP","authors":"Ki-Il Kim, Sang-Ha Kim, J. Moon, Y. Kim","doi":"10.1109/MILCOM.2002.1180481","DOIUrl":"https://doi.org/10.1109/MILCOM.2002.1180481","url":null,"abstract":"A lot of different researches have been done for guaranteeing quality-of-service (QoS) to the mobile host in the Internet regardless of the attachment points. However, most of the researches concentrate on adopting the integrated service (IntServ) or differentiated service (DiffServ) over the tunneling section between the home agent and the foreign agent. Also, most researches seem to neglect admission control considering handoff and the QoS architecture. In the big picture for QoS, the end-to-end QoS can be guaranteed by combining, intra-domain QoS and inter-domain QoS. So, if it is possible to guarantee intra-domain QoS, inter-domain QoS can be guaranteed by negotiation between domains. We present the intra-domain QoS guarantee mechanism, which can support host mobility. We redefine intra-domain QoS as an interoperation of micro-level QoS and macro-level QoS, considering protocols that support host mobility and currently discussed in IETF Mobile IP WG. For the microlevel QoS, several admission control mechanisms may limit the handoff dropping and cell overload probability in wireless network. But, it is not enough. Whenever the mobile host moves between different subnet, it may be blocked if available bandwidth is not reserved between gateway home agent and current gateway foreign agent. So, new admission control considering mobility in the macro-level QoS has to be developed. In our proposal, bandwidth broker (BB) in DiffServ network performs the admission control based on the available bandwidth between the gateway home agent and the current gateway foreign agent in addition to neighboring gateway foreign agents, where the mobile host may possibly visit during the lifetime of the connection.","PeriodicalId":191931,"journal":{"name":"MILCOM 2002. Proceedings","volume":"369 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":"115966252","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: 4

Navy intrusion detection solution 海军入侵检测解决方案

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1179703

J. Yen, F. Ottaviano, R. Granvold

引用次数: 0

A new algorithm for joint impulse response shortening in DMT systems DMT系统联合脉冲响应缩短新算法

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1180506

Jianinin Zhang, W. Ser

引用次数: 0

Symbolic dynamics method for chaotic communications 混沌通信的符号动力学方法

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1180445

M. Carroll, C. Williams

引用次数: 7

On static and dynamic code assignment policies in the OVSF code tree for CDMA networks CDMA网络OVSF码树中的静态和动态码分配策略

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1179573

Jun-Seong Park, D.C. Lee

{"title":"On static and dynamic code assignment policies in the OVSF code tree for CDMA networks","authors":"Jun-Seong Park, D.C. Lee","doi":"10.1109/MILCOM.2002.1179573","DOIUrl":"https://doi.org/10.1109/MILCOM.2002.1179573","url":null,"abstract":"We introduce two new policies, static code assignment (SCA) and enhanced dynamic code assignment (EDCA), for assigning OVSF (orthogonal variable-spreading-factor) codes in heavily-loaded code-division multiple access systems that serve users with multiple data rates. The goal is to maximize the average throughput of the system. We present a numerical analysis based on a basic queueing model and compare the proposed techniques with the existing DCA scheme. The SCA assigns and fixes a partial set of OVSF codes in the binary code tree so that the average throughput is maximized for randomly arriving call requests. The configuration of the best partial set of OVSF codes depends on the ratios of the mixed call arrival rates. When the system becomes heavily loaded, SCA begins to outperform DCA in terms of average throughput. Another advantage of the static assignment is that it does not require any complex reassignments of codes to support a newly-arriving call. The EDCA resorts to a stationary dynamic call admission policy that accepts or rejects a newly arriving call on the basis of the state in the Markov decision process modeling call arrivals and departures. EDCA allows code reassignment to maximize the spectral efficiency. We derive an optimal EDCA policy through linear programming to solve for the optimal policy of the Markov decision process. Comparing DCA and EDCA, it is indicated that the greedy policy of DCA may not be optimal in terms of the long-term average rate of the total data served. Simulation and numerical evaluation confirms that EDCA performs better than DCA as the traffic load increases and high-rate calls become dominant.","PeriodicalId":191931,"journal":{"name":"MILCOM 2002. Proceedings","volume":"15 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":"127203938","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: 8