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Proceedings IEEE 56th Vehicular Technology Conference最新文献

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Performance evaluation of a SIP-based state-sharing mechanism 基于sip的状态共享机制的性能评估
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040577
M. Bozinovski, L. Gavrilovska, R. Prasad
{"title":"Performance evaluation of a SIP-based state-sharing mechanism","authors":"M. Bozinovski, L. Gavrilovska, R. Prasad","doi":"10.1109/VETECF.2002.1040577","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040577","url":null,"abstract":"The Session Initiation Protocol (SIP) has been selected to manage sessions within the 3GPP IP-based multimedia subsystem (IMS). SIP sessions have to be highly available and reliable. This paper presents a performance evaluation of a novel state-sharing algorithm for providing reliable SIP services. The novelty is a result of sharing SIP (application-protocol) states as opposed to transport-protocol states. The most important performance parameters are evaluated in terms of the system variables such as server failure and repair time distributions, call arrival and call duration distributions, and link parameters, i.e., delay and bandwidth. The considered performance parameters are availability, reliability and dependability. Concerning the state transport mechanism, the results show that TFTP significantly outperforms FTP with respect to the overall performance.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133492702","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
42-volt electrical power system for military vehicles - comparison with commercial automotive systems 军用车辆的42伏电力系统-与商用汽车系统的比较
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040536
M. Masrur, J. Monroe, R. Patel, V. Garg
{"title":"42-volt electrical power system for military vehicles - comparison with commercial automotive systems","authors":"M. Masrur, J. Monroe, R. Patel, V. Garg","doi":"10.1109/VETECF.2002.1040536","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040536","url":null,"abstract":"A comparative study of needs and issues to implement 42-volt DC power systems in military and the commercial vehicles is presented. The current voltage levels of 14 volts in commercial and generally 28 volts in military vehicles have difficulty in sustaining the growing demands of electrical loads, created largely due to the advent of power electronics. Presently the 42-volt system is finding its headway in the commercial automotive industry. However, there still remain some significant issues, that need to be carefully examined in order to transition 42-volt systems into military vehicles. The difference between the military and commercial applications of 42 volt is also described including any ramifications due to this difference.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132590297","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
On nonlinear decision functions applied to adaptive equalization for fading channels 非线性决策函数在衰落信道自适应均衡中的应用
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040673
Y.F. Lee, M. Wang
{"title":"On nonlinear decision functions applied to adaptive equalization for fading channels","authors":"Y.F. Lee, M. Wang","doi":"10.1109/VETECF.2002.1040673","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040673","url":null,"abstract":"In a previous paper (see Proc. of IEEE Malaysia International Conference on Communication, p.280-4, 2001) we proposed a nonlinear decision function for adaptive equalization in the presence of Rayleigh fading. A conventional decision function in adaptive equalization makes use of a hard decision threshold device to generate a difference signal (sometimes also called error signal) necessary in the process of updating the tap weights of the equalizer. This has the disadvantage of not differentiating a very weak signal from a strong signal. Our proposed nonlinear decision function approach weighs less on weak signals and is shown to provide enhancement over a conventional decision function. In this paper, we attempt to justify the use of the proposed clipped parabolic nonlinear decision function and investigate various possible forms of nonlinear decision functions.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127636331","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
An adaptive two-copy delayed SR-ARQ for satellite channels with shadowing 带阴影卫星信道的自适应双拷贝延迟SR-ARQ
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040720
Jing Zhu, S. Roy
{"title":"An adaptive two-copy delayed SR-ARQ for satellite channels with shadowing","authors":"Jing Zhu, S. Roy","doi":"10.1109/VETECF.2002.1040720","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040720","url":null,"abstract":"The paper focuses on improving performance of land mobile satellite channels (LMSC) at high band (K or EHF band), where shadowing is the primary impediment to reliable data transmission. Compared with multipath fading, shadowing exists on a longer time scale. Hence interleaving to combat shadowing introduces unacceptably large decoding delay. Here we propose an adaptive two-copy delayed SR-ARQ scheme whereby two copies of a packet are sent - the second with a delay relative to the first - in every transmission or retransmission. Closed-form expressions for mean transmission time, success probability, and residual loss probability are provided and simulation is used to validate the analysis. Furthermore, the issue of optimizing delay is addressed as well, and a simple yet effective strategy is suggested to support TCP traffic. By simulation, we compare the proposal with the normal SR-ARQ scheme in terms of TCP end-to-end throughput, and show great performance improvement achieved by our method.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134459374","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
Spreading code sharing MPSK-MC-CDMA system for low PAPR in wireless communications 面向低PAPR无线通信的扩频码共享MPSK-MC-CDMA系统
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040682
T. Ginige, N. Rajatheva, K. M. Ahmed
{"title":"Spreading code sharing MPSK-MC-CDMA system for low PAPR in wireless communications","authors":"T. Ginige, N. Rajatheva, K. M. Ahmed","doi":"10.1109/VETECF.2002.1040682","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040682","url":null,"abstract":"We introduce a spreading code sharing M-ary PSK multicarrier CDMA (SCS-MPSK-MC-CDMA) system to obtain low peak-to-average-power ratio (PAPR) level in MC-CDMA system. The main advantage of the system is that low PAPR values can be obtained with a large system capacity. However, BER performance is similar to the conventional M-ary PSK MC-CDMA system. The PAPR reduction method of low PAPR spreading code selection (see Thilak Ginige et al., WPMC'00, vol.1., p.39-44, 2000) can be applied with the 4-QAM-OFDM-CDMA system as well as SCS-MPSK-MC-CDMA systems. It can be shown that, by applying this technique, the 15 dB PAPR level of a 90 user conventional MPSK-MC-CDMA system with 128 Walsh Hadamard (WH) code can be reduced to 13 dB by employing 64 WH codes with the same capacity and data rate. The dynamic spreading code allocation technique (see Thilak Ginige et al., IEEE Commun. Letters, p.408-10, 2001) also can be applied in SCS-MPSK-MC-CDMA system to reduce PAPR level further. Since MPSK systems are extremely sensitive to phase errors, the proposed SCS-MPSK-MC-CDMA system can be applied to indoor wireless systems with a larger number of users.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131424334","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
Game theoretic formulations for network-assisted resource management in wireless networks 无线网络中网络辅助资源管理的博弈论公式
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040428
D. Krishnaswamy
{"title":"Game theoretic formulations for network-assisted resource management in wireless networks","authors":"D. Krishnaswamy","doi":"10.1109/VETECF.2002.1040428","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040428","url":null,"abstract":"This paper proposes game-theoretic formulations for addressing resource management issues in GSM/GPRS/EGPRS-based and CDMA/HDR-CDMA-based wireless networks. Network-assisted resource management is used, with minimal inter-base signaling costs, to transfer the intelligence and control needed from the terminal to the network. Both non-cooperative and coalitional games are used to address resource management issues such as link adaptation with power control, channel re-allocation, channel re-assignment, and, hard and soft handoffs with power control.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127385907","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
Pilot-channel aided pipeline scheme for interference cancellation in uplink DS/CDMA system 上行DS/CDMA系统中导频辅助管路干扰消除方案
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040643
Chih-Hsuan Tang, Che-Ho Wei
{"title":"Pilot-channel aided pipeline scheme for interference cancellation in uplink DS/CDMA system","authors":"Chih-Hsuan Tang, Che-Ho Wei","doi":"10.1109/VETECF.2002.1040643","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040643","url":null,"abstract":"We propose a pilot-channel aided pipeline scheme for interference cancellation (IC) in the wideband DS/CDMA system uplink. Generally speaking, pipelined implementation is inherent in SIC (successive interference cancellation) but not in channel estimation. This scheme combines channel estimation and user data detection into the sequential type with low complexity and leads to pipeline implementation. Besides, interference between data channel signals and pilot channel signals under multipath fading channels is also taken into consideration. Compared with conventional channel estimation using correlator output and SIC without pilot signal remover, the proposed scheme shows better quality both on channel estimation and user data detection.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133828012","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
A quick simulation method for fading communications channels using a novel eigenvalue importance sampling technique 一种基于特征值重要性采样技术的衰落信道快速仿真方法
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040383
J. Ho, P.J. Smith
{"title":"A quick simulation method for fading communications channels using a novel eigenvalue importance sampling technique","authors":"J. Ho, P.J. Smith","doi":"10.1109/VETECF.2002.1040383","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040383","url":null,"abstract":"In this paper, we introduce a quick simulation method for fading communications channels using a novel eigenvalue importance sampling technique. Our approach is motivated by the fact that many performance analyses involve metrics which are functions of the eigenvalues of the channel correlation matrix. More specifically in Rayleigh fading we often require the eigenvalues of the Wishart matrix HH/sup /spl dagger// where H is the matrix of channel gains. Hence we propose direct simulation of the Wishart eigenvalues rather than simulation of the full channel matrix. If H is n/sub R//spl times/n/sub T/ then this idea in itself reduces simulation time since m=min(n/sub R/, n/sub T/) eigenvalues are required rather than the 2/spl times/n/sub R//spl times/n/sub T/ real Gaussians. However, direct generation of the eigenvalues; is complicated. Therefore we introduce a novel eigenvalue importance sampling technique which generates the eigenvalues from a simple biased density which \"mimics\" the real density. We call our approach eigenvalue importance sampling (EVIS). Secondly, we try to reduce rare event simulation time by using biased eigenvalue densities to encourage the rare event of interest. We denote this approach rare event eigenvalue importance sampling (REVIS). Both methods are demonstrated via the example of simulating capacity outages and values for a MIMO system. Results show that considerable savings are offered by this novel approach even with simple implementations and small scale systems (m/spl les/4).","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115523240","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
Space-time coding using MSK 利用MSK进行空时编码
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040373
J. Cavers
{"title":"Space-time coding using MSK","authors":"J. Cavers","doi":"10.1109/VETECF.2002.1040373","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040373","url":null,"abstract":"Space-time (ST) codes presented to date are based on non-offset, linear modulation formats. However, the paper demonstrates compelling advantages for ST codes based on MSK, an offset format. ST codes with offset modulation give better performance than QPSK for the same number of states, and the MSK ST decoding computational load is smaller than that of QPSK by a ratio that improves exponentially with the number of antennas. They are easily designed for any number of antennas. In addition, their constant envelope allows transmission with inexpensive Class C amplifiers.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115539162","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
Impulse compression for OFDM transmission over time-varying multipath channels 时变多径信道OFDM传输的脉冲压缩
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040768
R. Schur
{"title":"Impulse compression for OFDM transmission over time-varying multipath channels","authors":"R. Schur","doi":"10.1109/VETECF.2002.1040768","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040768","url":null,"abstract":"In today's multicarrier modulation systems such as orthogonal frequency division multiplexing (OFDM) a circular extended guard interval is inserted between successive multicarrier symbols in order to reduce intersymbol and interchannel interference. The length of the guard interval is determined by the length of the channel impulse response. In this paper, we consider an equalizer to compress the channel impulse response for OFDM transmission. Due to the compression effect, the guard interval can be reduced and the efficiency of the OFDM system increases. The system performance is demonstrated for transmission over several time-varying multipath channels with additive white Gaussian noise (AWGN).","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115578344","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: 10
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