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2007 IEEE 66th Vehicular Technology Conference最新文献

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Blind Channel Estimation for Zero-Padded OFDM Systems Based on Correlation Matching 基于相关匹配的补零OFDM系统盲信道估计
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.280
F. D. Backx, T. Vinhoza, R. Neto
{"title":"Blind Channel Estimation for Zero-Padded OFDM Systems Based on Correlation Matching","authors":"F. D. Backx, T. Vinhoza, R. Neto","doi":"10.1109/VETECF.2007.280","DOIUrl":"https://doi.org/10.1109/VETECF.2007.280","url":null,"abstract":"In this work, we propose a new blind channel estimator based on correlation-matching techniques for zero padded OFDM systems. The correlation matching approach consists in matching the observation covariance matrix, which is parameterized by the unknown channel vector, with its estimates based on the received observations. The channel estimate, within a complex scalar ambiguity, can be obtained blindly as the solution of a minimization problem. Consistency of the estimator is addressed. Mean square error performance of the proposed estimator and the resulting bit-error rate (BER) performance after zero-forcing equalization are analyzed through computer simulations. The results show the robustness of the proposed technique.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"247 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114603909","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
DSP Design of Channel Estimation in MIMO-OFDM System MIMO-OFDM系统信道估计的DSP设计
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.274
Mu Xiao Ting, Z. Yu, Tao Bing, Tao Xiao Feng
{"title":"DSP Design of Channel Estimation in MIMO-OFDM System","authors":"Mu Xiao Ting, Z. Yu, Tao Bing, Tao Xiao Feng","doi":"10.1109/VETECF.2007.274","DOIUrl":"https://doi.org/10.1109/VETECF.2007.274","url":null,"abstract":"In this paper, the simplified DSP implementation of training sequence-based on Least Square (LS) channel estimation in MIMO-OFDM system was demonstrated. A proper design of the training sequence not only simplifies channel estimation, but also still obtains the best estimation performance. For the purpose of getting channel estimation algorithm to work in real time, some main approaches are carried out to speed up operation, saving memory and improving accuracy. Statistics on resource occupation and running time of such a scheme in TMSC6416 chip was given. While the implementation is applicable in B3G MIMO-OFDM system, which adopted 4 transmit antennas and 8 receive ones.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114511355","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
The Spatial Reuse Slot Allocation with Reallocating Neighbor Links in the TDMA-Based Wireless Mesh Network 基于tdma的无线Mesh网络中具有邻居链路重分配的空间复用槽分配
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.315
Kentaro Saito, M. Nakayama
{"title":"The Spatial Reuse Slot Allocation with Reallocating Neighbor Links in the TDMA-Based Wireless Mesh Network","authors":"Kentaro Saito, M. Nakayama","doi":"10.1109/VETECF.2007.315","DOIUrl":"https://doi.org/10.1109/VETECF.2007.315","url":null,"abstract":"With the wide spread of broadband wireless communication devices such as wireless LAN and UWB, the wireless mesh network becomes common. As the mobile terminal's ability is getting advance in recent time, wireless mesh network is expected to support QoS for the multimedia application's traffic. The bandwidth reservation technologies that use TDMA-based MAC guarantee the QoS of these traffic. Each flow reserves the time slots for its route at the beginning of the communication. In the reservation, the network capacity improves greatly by considering the spatial reuse of slots. However, in the current researches, each flow considers the spatial reuse only within its route and consumes other flow's available slots. In this paper, we propose \"Spatial Reuse Slot Allocation with Reallocating Neighbor Links\" (SRSA-RNL). In SRSA-RNL, each flow gathers the neighbor link's slot information and reallocates the slots of these links by considering the spatial reuse among these links. We showed SRSA-RNL improved the data transmission in the network by 8% in the simulation.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"166 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114737550","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
On the Use of Implicit Pilots for Channel Estimation with OFDM Modulations 利用隐式导频进行OFDM调制信道估计
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.233
R. Dinis, N. Souto, J. C. Silva, Atul Kumar, A. Correia
{"title":"On the Use of Implicit Pilots for Channel Estimation with OFDM Modulations","authors":"R. Dinis, N. Souto, J. C. Silva, Atul Kumar, A. Correia","doi":"10.1109/VETECF.2007.233","DOIUrl":"https://doi.org/10.1109/VETECF.2007.233","url":null,"abstract":"A coherent detection of OFDM signals (Orthogonal Frequency Division Multiplexing) allows good performances in severely time-dispersive channels. However, coherent receivers require good channel estimates, a difficult task when the channel impulse response is long and/or when space diversity techniques are employed. Usually, the channel estimates are obtained with the help of pilot symbols multiplexed with data symbols, which reduces the useful bit rate, decreasing the spectral efficiency of the systems. To avoid this, we consider the use of implicit pilots instead of multiplexed pilots. Since the interference levels between data and pilots might be very high, we propose an iterative receiver with joint detection and channel estimation. Our performance results show that our technique allows the use of low-power pilots, with performances close to the ones with perfect channel estimation, even when space diversity techniques are employed.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114909642","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 Novel Chase Based Multiuser Detector for MIMO-CDMA Systems 一种基于追踪的MIMO-CDMA多用户检测器
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.212
Feng Liu, M. R. Soleymani
{"title":"A Novel Chase Based Multiuser Detector for MIMO-CDMA Systems","authors":"Feng Liu, M. R. Soleymani","doi":"10.1109/VETECF.2007.212","DOIUrl":"https://doi.org/10.1109/VETECF.2007.212","url":null,"abstract":"This paper proposes a new chase based multiuser detection scheme for MIMO-CDMA systems. The proposed approach provides performance gain by concentrating on improving the detection accuracy of the weakest symbol. Compared to the layered space-time multiuser detector (LAST-MUD), the proposed scheme can achieve substantial performance improvement, especially, when the number of transmit antennas is equal to the number of receive antennas. The comparison between our scheme and another chase based scheme, the B-Chase detector, which was originally proposed for improving the performance of the vertical Bell Laboratories layered space-time (V-BLAST) system, is also presented. The problem existing in the B-Chase detector is the criterion for selecting the weakest symbol. In our scheme, a more reasonable selection criterion is proposed. We show that the proposed scheme has less complexity than the B-Chase detector but with the tendency of achieving better performance at high SNR.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114930426","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
Impacts of Radio Access Protocols on Cooperative Collision Avoidance in Urban Traffic Intersection Scenarios 无线接入协议对城市交通交叉口协同避碰的影响
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.301
Fan Yu, S. Biswas
{"title":"Impacts of Radio Access Protocols on Cooperative Collision Avoidance in Urban Traffic Intersection Scenarios","authors":"Fan Yu, S. Biswas","doi":"10.1109/VETECF.2007.301","DOIUrl":"https://doi.org/10.1109/VETECF.2007.301","url":null,"abstract":"This paper presents a performance comparison between the DSRC-recommended 802.11 Medium Access Control (MAC) and a novel Vehicular Self-Organizing MAC (VeSOMAC) protocol in the context Intelligent Transportation System applications. VeSOMAC is a distributed TDMA protocol that relies on in-band control exchange for autonomous and self-configurable TDMA slot allocation. Detailed network and vehicular traffic models have been developed for a Cooperative Collision Control (CCA) application operating in urban traffic intersection scenarios. Simulation results demonstrate that unlike the 802.11 style contention based protocols, VeSOMAC can offer better vehicle safety through smaller and bounded packet latency in vehicular ad hoc networks.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116982197","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
Optimal Zone (OZON) Protocol for Broadcast Control in Ad-Hoc Networks Ad-Hoc网络中广播控制的最优区域(OZON)协议
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.50
N. Thanthry, Deependra Malla, R. Pendse
{"title":"Optimal Zone (OZON) Protocol for Broadcast Control in Ad-Hoc Networks","authors":"N. Thanthry, Deependra Malla, R. Pendse","doi":"10.1109/VETECF.2007.50","DOIUrl":"https://doi.org/10.1109/VETECF.2007.50","url":null,"abstract":"Mobile ad-hoc networks have been envisioned as the future of wireless networking technology. Continuous efforts are being put to improve the performance of ad-hoc networks in terms of path selection, quality of service (QoS), battery efficiency and security. Various routing protocols (proactive and reactive) have been proposed in this field for selecting the best path between the source and the destination. Self Learning Ad-Hoc Routing Protocol (SARP) is one such routing protocol which tries to reduce the control overhead during the path establishment process by piggybacking the information about the intermediate nodes in every path establishment message. Broadcasting of route discovery messages is an essential process in an ad-hoc network. However, in most cases, every node rebroadcasts these messages, resulting in broadcast storms which affect the ad-hoc network performance. In this research work, the authors propose a multicast based approach, i.e., Optimal Zone (OZON) with respect to SARP routing protocol, to control the number of rebroadcasts. OZON defines an optimal zone for every node where only the nodes at the boundary of the optimal zone are allowed to rebroadcast the messages. This reduces the number of broadcast messages in an ad-hoc network to a large extent and also helps in conserving the battery power. The authors evaluate the efficiency of the proposed OZON concept by comparing the performance of OZON enabled SARP (EE-SARP) with AODV, DSR and SARP. Simulation results indicate a significant reduction in the number of control packets and energy consumption.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123487531","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
A New Information Lossless STBC for 2 Transmit Antennas with Reduced-Complexity ML Decoding 一种新的具有低复杂度ML解码的双发射天线信息无损STBC
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.171
P. Rabiei, N. Al-Dhahir
{"title":"A New Information Lossless STBC for 2 Transmit Antennas with Reduced-Complexity ML Decoding","authors":"P. Rabiei, N. Al-Dhahir","doi":"10.1109/VETECF.2007.171","DOIUrl":"https://doi.org/10.1109/VETECF.2007.171","url":null,"abstract":"A new information lossless, full-rate space-time block code is presented for 2 transmit antennas over 2 symbol periods. We show that our code is capacity-achieving and exploit its special algebraic structure to derive a reduced-complexity maximum-likelihood (ML) decoding algorithm. When the number of receive antennas is greater than 1, our code outperforms the Alamouti code. Comparing the performance of our code with state-of-the-art B2Phi and Golden codes in [4] and [7], demonstrates competitive performance for practical low-to-medium SNR ranges, for high spectral efficiencies, and as the number of receive antennas increases while requiring much lower ML decoding complexity.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116813990","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
Heterogenous Information Aided Semiblind Group MUD for MIMO MC-CDMA Systems MIMO MC-CDMA系统的异构信息辅助半盲群MUD
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.162
Hoang-Yang Lu, Wen-Hsien Fang, Yie-Tarng Chen, Kuo-Liang Yeh
{"title":"Heterogenous Information Aided Semiblind Group MUD for MIMO MC-CDMA Systems","authors":"Hoang-Yang Lu, Wen-Hsien Fang, Yie-Tarng Chen, Kuo-Liang Yeh","doi":"10.1109/VETECF.2007.162","DOIUrl":"https://doi.org/10.1109/VETECF.2007.162","url":null,"abstract":"This paper presents an effective semiblind group multiuser detector (MUD) for uplink multiple-input multiple- output (MIMO) multi-carrier code division multiple access (MC- CDMA) systems. The MUD considered is a two-stage linear constrained minimum variance (LCMV) detector which uses heterogeneous information (both hard and soft) to enhance the interference cancellation capability. The first stage LCMV detector produces a tentative detection output, while at the second stage a bank of soft LCMV detectors successively refine the estimated interference group by group with the assistance of the heterogeneous information in the symbol detection process. In addition, to avoid the annoying ordering mechanism, a channel- strength criterion is employed to order the groups at the second stage. Conducted simulations show that the proposed MUD can drastically enhance the performance compared with previous works, especially when the hardware cost is at a premium.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129444694","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
Multi-Channel Radio Resource Distribution Policies in Heterogeneous Traffic Scenarios 异构业务场景下的多通道无线资源分配策略
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.354
M. C. Lucas-Estañ, J. Gozálvez, J. Sánchez-Soriano, M. Pulido, Daniel Calabuig
{"title":"Multi-Channel Radio Resource Distribution Policies in Heterogeneous Traffic Scenarios","authors":"M. C. Lucas-Estañ, J. Gozálvez, J. Sánchez-Soriano, M. Pulido, Daniel Calabuig","doi":"10.1109/VETECF.2007.354","DOIUrl":"https://doi.org/10.1109/VETECF.2007.354","url":null,"abstract":"Multi-channel operation in wireless systems has been proposed to increase user throughput and reduce transmission delays. However, multi-channel operation requires adequate resource allocation policies to guarantee user fairness and avoid channel access stagnation. The definition of such policies is particularly challenging in heterogeneous traffic scenarios where each traffic service has different quality of service requirements. In this context, this work proposes and evaluates various multi-channel radio resource distribution policies designed to operate under heterogeneous traffic environments. In particular, this paper proposes the application of bankruptcy policies to guarantee user fairness, and compares their performance to other schemes. The proposed policies can also be extended to manage radio resources in heterogeneous wireless systems.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128505005","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: 14
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