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2007 IEEE 66th Vehicular Technology Conference最新文献

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Successive Maximum Likelihood Estimation for Time and Frequency Synchronization 时频同步的逐次最大似然估计
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.295
Yingming Tsai, Guodong Zhang, Xiaodong Wang
{"title":"Successive Maximum Likelihood Estimation for Time and Frequency Synchronization","authors":"Yingming Tsai, Guodong Zhang, Xiaodong Wang","doi":"10.1109/VETECF.2007.295","DOIUrl":"https://doi.org/10.1109/VETECF.2007.295","url":null,"abstract":"A new repetitive synchronization signal structure is proposed for wireless communication systems. A corresponding successive maximum likelihood detection algorithm that uses the proposed synchronization signals is provided. The successive maximum likelihood detection algorithm uses reliably estimated frequency offset in a successive way to refine the estimated timing offset. The performance of our approach is evaluated and compared to other existing algorithms.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"45 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":"122038624","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
Resource Allocation in Multiuser OFDM Distributed Antenna Systems 多用户OFDM分布式天线系统中的资源分配
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.379
Wenjun Xu, K. Niu, Zhiqiang He, Weilin Wu
{"title":"Resource Allocation in Multiuser OFDM Distributed Antenna Systems","authors":"Wenjun Xu, K. Niu, Zhiqiang He, Weilin Wu","doi":"10.1109/VETECF.2007.379","DOIUrl":"https://doi.org/10.1109/VETECF.2007.379","url":null,"abstract":"This paper formulates resource allocation problem in orthogonal frequency division multiplexing (OFDM) distributed antenna systems (DAS) by extending conventional one in OFDM co-located antenna systems (CAS). The algorithm to achieve maximum rate-sum capacity is derived, and the achievable capacity of a single user is also given by theoretical analysis. Simulated and theoretical results show that OFDM DAS can achieve much more rate-sum capacity than OFDM CAS, and the performance gain increases with the number of antennas in systems.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"222 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":"122183728","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
ITP&SUI-Based Channel Assignment in CAC Procedure for TDD-CDMA System 基于itp&sui的TDD-CDMA系统CAC信道分配
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.348
Chen Bo, Hong Liang, Chang Yong-yu, Yang Guang
{"title":"ITP&SUI-Based Channel Assignment in CAC Procedure for TDD-CDMA System","authors":"Chen Bo, Hong Liang, Chang Yong-yu, Yang Guang","doi":"10.1109/VETECF.2007.348","DOIUrl":"https://doi.org/10.1109/VETECF.2007.348","url":null,"abstract":"Initial transmission power and spatial user information (ITP&SUI)-based channel assignment algorithm in CAC procedure is proposed and studied in a TDD-CDMA cellular system. Time slot priority is introduced as the criteria of channel assignment. New user will be assigned in the time slot which has the highest priority. The time slot priority is updated dynamically according to our proposed algorithm at the node B. The performance of the algorithm is compared together with other traditional algorithms under both homogeneous and hot spot traffic loading via computer simulation. The results show that the ITP&SUI-based channel assignment algorithm always outcomes the traditional algorithm in both downlink and uplink. The primary benefit of ITP&SUI-based channel assignment algorithm in the TDD-CDMA cellular system, however, lies in improving the system performance and saving the power consumption of UE, especially under hot spot traffic.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"2 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":"129602964","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 Evaluation of Party Protocol 缔约方协议的绩效评估
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.29
G. A. Sukkar, M. Sabeur, H. Afifi, B. Jouaber, D. Zeghlache, S. Senouci
{"title":"Performance Evaluation of Party Protocol","authors":"G. A. Sukkar, M. Sabeur, H. Afifi, B. Jouaber, D. Zeghlache, S. Senouci","doi":"10.1109/VETECF.2007.29","DOIUrl":"https://doi.org/10.1109/VETECF.2007.29","url":null,"abstract":"In this paper we study a self organizing network architecture, party. Party is a new routing protocol intended to be applied in environments with large number of nodes where the scalability of the routing protocol plays an important role. Party's routing is unique and only depends on the current node's neighborhood. Routing tables are created on the basis of the first hop neighborhood only. We will show the protocol performance with a large number of nodes in the network, and compare it to the legacy ad hoc routing protocols. Results show a large improvement in terms of overhead and throughput.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"25 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":"128300733","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 Price-Based Distributed Algorithm for Optimal Utility-Energy Trade-Off in Wireless Sensor Networks 基于价格的分布式无线传感器网络效用-能量最优权衡算法
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.45
W. Cheng, Shengbin Liao, Wei Liu, Zongkai Yang, Kanru Xu
{"title":"A Price-Based Distributed Algorithm for Optimal Utility-Energy Trade-Off in Wireless Sensor Networks","authors":"W. Cheng, Shengbin Liao, Wei Liu, Zongkai Yang, Kanru Xu","doi":"10.1109/VETECF.2007.45","DOIUrl":"https://doi.org/10.1109/VETECF.2007.45","url":null,"abstract":"Wireless sensor networks (WSNs) are energy- constrained in nature, in this paper, we formulate the problem of data transport in sensor networks as a network utility maximization (NUM) problem, but we argue that each source utility not only depends on its source rate, but also on the consumed energy, this leads to a coupled utility model, where the utilities are functions of source rates and consumed energy. Differentiating from the classical NUM framework which usually takes the consumed energy as constraints. Our utility model regards consumed energy as one of the components of measure of the utility values, which indicates the tradeoff of source rates and consumed energy, it is a more accurate utility model for abstracting the energy characteristics for data gathering and transmission in WSNs. Due to the coupled energy utility, our optimization problem is not separable. Despite the difficulty, we present a systematic approach to decouple our NUM problem with coupled utilities by introducing into the slack variables and using dual decomposition techniques, and obtain a distributed algorithm for solving this problem. The proposed algorithm can converge to the Pareto optimal tradeoff between rates and energy for all users.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"94 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":"128995747","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
Access Mechanism for Multihop Cellular Networks 多跳蜂窝网络的接入机制
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.72
K. Govindan, S. Merchant, U. Desai
{"title":"Access Mechanism for Multihop Cellular Networks","authors":"K. Govindan, S. Merchant, U. Desai","doi":"10.1109/VETECF.2007.72","DOIUrl":"https://doi.org/10.1109/VETECF.2007.72","url":null,"abstract":"We propose a CDMA-OFDM access mechanism for Multihop Cellular Networks (MCN). We construct groups within the MCN, where each group comprises of a source node, a destination node, their intermediate relay nodes and assign a correlated PN sequence to each such group. Within a particular group, a single carrier is assigned to each intermediate hop. The sub carriers assigned to the intermediate hops in a given group are mutually orthogonal. Hence the proposed OFDM is FDMA in nature. The sub carriers and transmit power levels to the relay nodes are assigned in such a way as to maximize the end-to-end throughput. The end-to-end throughput is formulated by assuming a Rayleigh flat fading channel between nodes. We present a method to reuse the PN codes assigned to the groups in a particular cell. We also introduce a novel architecture for MCN. Simulation results show that the proposed access mechanism achieves better end-to-end throughput and bit error rate (BER) performance as compared to standard access mechanisms like CDMA and OFDM-FDMA. Furthermore the proposed access mechanism has considerably higher BER performance in the presence of multiple transmit sources.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"1 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":"129250253","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
Out-of-Band Distortion Reduction in DVB-T Systems with Particle Swarm Digital Predistorters 基于粒子群数字预失真器的DVB-T系统带外失真降低
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.281
P. L. Carro, P. G. Ducar, J. D. Mingo, A. Valdovinos
{"title":"Out-of-Band Distortion Reduction in DVB-T Systems with Particle Swarm Digital Predistorters","authors":"P. L. Carro, P. G. Ducar, J. D. Mingo, A. Valdovinos","doi":"10.1109/VETECF.2007.281","DOIUrl":"https://doi.org/10.1109/VETECF.2007.281","url":null,"abstract":"Predistortion techniques are a well known power amplifier linearization method in order to reduce out-of band interferences in a non-constant envelope modulation system. A new adaptive digital predistorter based on the use of PSO (particle swarm optimization) algorithm is developed and applied in an orthogonal frequency-division multiplexing (OFDM) transmission scheme, such as a digital video broadcasting system. OFDM transmission is an efficient way to deal with multipath, being its implementation less complex than traditional equalizers, however, it is also very sensitive to nonlinear distortions due to its greatly variable envelope. The performance of this method has been verified by means of simulation using an amplifier characterized by a level-dependent complex gain using a memoryless model for different input power levels. In addition, the influence of some PSO parameters (the number of particles) on convergence is studied.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"1 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":"130623611","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
Optimal Training Sequences for MIMO Channel Estimation with Spatial Correlation 基于空间相关的MIMO信道估计最优训练序列
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.146
Jiyong Pang, Jiandong Li, Linjing Zhao, Zhuo Lu
{"title":"Optimal Training Sequences for MIMO Channel Estimation with Spatial Correlation","authors":"Jiyong Pang, Jiandong Li, Linjing Zhao, Zhuo Lu","doi":"10.1109/VETECF.2007.146","DOIUrl":"https://doi.org/10.1109/VETECF.2007.146","url":null,"abstract":"Optimal design of training sequences is considered for multiple-input multiple-output (MIMO) systems in the presence of spatial fading correlation. By the method of minimum mean square error (MMSE) channel estimation, we first evaluate the estimation accuracy and the training sequence length under correlated fading, based on which we then design optimal training sequences that have controllable length to make effective use of the correlation properties. It is investigated that the impacts of spatial correlation are helpful not only to improve channel estimation but also to decrease the training length, moreover, that the proposed training sequences have good performance via simulations.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"23 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":"123912964","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: 25
A New MIMO System for Gbps Transmission 一种新的Gbps传输MIMO系统
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.104
Yuro Lee, Minho Cheong, Seokhyun Yoon, Sok-Kyu Lee
{"title":"A New MIMO System for Gbps Transmission","authors":"Yuro Lee, Minho Cheong, Seokhyun Yoon, Sok-Kyu Lee","doi":"10.1109/VETECF.2007.104","DOIUrl":"https://doi.org/10.1109/VETECF.2007.104","url":null,"abstract":"In this paper, a receiver algorithm for an 8times8 MIMO system is considered for Giga-bps data transmission, in which the decoding complexity and latency are crucial factors for implementation of MIMO system with large number of transmit and receive antennae. To reduce computational complexity and the decoding latency, a 3-stage receiver algorithm is proposed. The MIMO receiver consists of multi-dimensional detection, partial interference cancellation and the weighted zero-forcing equalization, where the transmit antennae are divided into two group. The first group is encoded by a lower rate code and multi-dimensional search algorithm is used for demodulation and decoding, while the second group is encoded by higher rate code and weighted zero-forcing equalization is used. Once the first group is decoded successfully, they are cancelled out from the received vector for the decoding of the second group. The complexity and the error rate performance are investigated and compared with a well-known sphere decoding algorithm.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"32 1 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":"123204794","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
Performance Evaluation of 802.16e in Vehicle to Vehicle Channels 802.16e在车对车信道中的性能评估
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.300
Beibei Wang, I. Sen, D. Matolak
{"title":"Performance Evaluation of 802.16e in Vehicle to Vehicle Channels","authors":"Beibei Wang, I. Sen, D. Matolak","doi":"10.1109/VETECF.2007.300","DOIUrl":"https://doi.org/10.1109/VETECF.2007.300","url":null,"abstract":"Vehicle to vehicle (V2V) communications have drawn much attention in the past few years. The IEEE 802.16e standard systems can be considered potential candidates for these applications due to their attractive features, like high data rate, mobility support, etc. In this paper, we evaluate the performance of an 802.16e system with the OFDMA air interface in two non-stationary vehicle to vehicle (V2V) channels: an open area high traffic density (OHT) channel and an urban (UOC) channel. We first introduce the non-stationary V2V channel models developed from empirical data. Then we provide a brief overview of 802.16e and introduce three channel estimation schemes that apply to different scenarios. Finally, we evaluate the performance of the 802.16e system over the proposed non-stationary V2V channel models. We show that the proposed channel estimation methods provide a good tradeoff between channel estimation accuracy and computational complexity. We also illustrate that system performance in non-stationary channels is more volatile than in stationary channels.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"4 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":"123647344","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: 27
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