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Multiuser MIMO Transmission in Distributed Antenna Systems with Heterogeneous User Traffic 具有异构用户业务的分布式天线系统中的多用户MIMO传输
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6240224
Long Gao, S. Gaur, J. Acharya
{"title":"Multiuser MIMO Transmission in Distributed Antenna Systems with Heterogeneous User Traffic","authors":"Long Gao, S. Gaur, J. Acharya","doi":"10.1109/VETECS.2012.6240224","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6240224","url":null,"abstract":"In this paper, we consider multiuser transmission in the downlink of a distributed antenna system with two types of users: i) the real-time users that require a minimum instantaneous rate and ii) the best-effort users that try to maximize their rates. We start with a two-user system consisting of one real-time user and one best-effort user, in which the optimal beamforming scheme is proposed to maximize the instantaneous rate of the best-effort user under the rate constraint of the real-time user and per-antenna-power constraint. Two suboptimal transmission schemes are then proposed to reduce the computational complexity and feedback overhead, respectively. Furthermore, we propose a round-robin based scheduler to extend the proposed schemes to a general multiuser system, such that the outage probability of the real-time users is minimized. System-level simulation results show that the proposed schemes have better performance than two reference schemes.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124690579","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
Precoding with Known Transmit Coupling and Spatial Covariance Matrices 已知发射耦合和空间协方差矩阵的预编码
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6240089
Jinhui Chen, W. Fang, Fanglei Sun, Peng Shang, J. Wang
{"title":"Precoding with Known Transmit Coupling and Spatial Covariance Matrices","authors":"Jinhui Chen, W. Fang, Fanglei Sun, Peng Shang, J. Wang","doi":"10.1109/VETECS.2012.6240089","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6240089","url":null,"abstract":"A closed-form precoding scheme using the knowledge of transmit coupling and spatial covariance matrices is proposed, which ensures that the achievable rate increases with the number of transmit antennas when the size of the transmit antenna array is fixed and the radiated power, but not the amplifier output power, is constrained. Eigenvalue-proportional power allocation is employed in this precoding scheme. Simulation shows that the performance of eigenvalue-proportional power allocation is close to that of covariance matrix based waterfilling power allocation. Energy efficiency of different schemes is evaluated and compared.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124769026","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
V-DESYNC: Desynchronization for Beacon Broadcasting on Vehicular Networks V-DESYNC:车载网络上信标广播的去同步
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6239966
Tossaphol Settawatcharawanit, S. Choochaisri, C. Intanagonwiwat, K. Rojviboonchai
{"title":"V-DESYNC: Desynchronization for Beacon Broadcasting on Vehicular Networks","authors":"Tossaphol Settawatcharawanit, S. Choochaisri, C. Intanagonwiwat, K. Rojviboonchai","doi":"10.1109/VETECS.2012.6239966","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6239966","url":null,"abstract":"Several prospective applications on vehicular networks have been defined. Most applications rely on beaconing mechanisms to broadcast the presence and updated information of a vehicle to surrounding neighbors. However, due to the broadcasting nature, no acknowledgement mechanism is provided. Therefore, vehicles do not perceive beacon collision if two or more vehicles simultaneously broadcast the beacons. Consequently, vehicles miss updated information from their neighbors. In this paper, we propose V-DESYNC, an algorithm that distributively desynchronizes vehicles to broadcast beacons at different times based on only timing information. V-DESYNC is designed to avoid the beacon collision and tolerate the highly dynamic behavior of vehicular networks. Our evaluation results indicate that V-DESYNC can significantly reduce the number of beacon collisions without decreasing the beaconing rate on vehicular networks.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129448544","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: 16
Optimal Power Allocation in a Spectrum Sharing System with Partial CSI 部分CSI频谱共享系统的最优功率分配
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6239991
Xitao Gong, Guido Dartmann, A. Ispas, G. Ascheid
{"title":"Optimal Power Allocation in a Spectrum Sharing System with Partial CSI","authors":"Xitao Gong, Guido Dartmann, A. Ispas, G. Ascheid","doi":"10.1109/VETECS.2012.6239991","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6239991","url":null,"abstract":"This paper studies an optimal power allocation strategy in spectrum-sharing cognitive radio systems. In reality, it is difficult for the secondary users (SUs) to obtain perfect channel state information (CSI) related to the primary users (PUs) due to the lack of cooperation between the SUs and the PUs. We assume that only instantaneous CSI of the secondary link and statistical CSI of the other links is available to the SUs. This assumption not only reveals the realistic challenges, but also brings mathematical challenges in solving the optimization problem in closed form, since the performance evaluated with statistical CSI involves expectation operations. We reformulate the objective function in closed form and derive the optimal power allocation solution. The feasibility of the solution is discussed. Furthermore, we provide several interesting insights into the achievable performance based on the properties of the solution.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129457757","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: 6
Design of a New Signal Structure for Active Sensing in Cognitive Radio Systems 认知无线电系统中主动感知信号结构的设计
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6239990
Han-Wei Chen, Chin-Liang Wang
{"title":"Design of a New Signal Structure for Active Sensing in Cognitive Radio Systems","authors":"Han-Wei Chen, Chin-Liang Wang","doi":"10.1109/VETECS.2012.6239990","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6239990","url":null,"abstract":"Spectrum sensing is one of the major elements of cognitive radio (CR) systems. The periodic spectrum sensing frame structure can provide reliable sensing agility by introducing sensing quiet periods among signal frames to protect the primary users (PUs) from interference. However, arranging too many intra-frame sensing quiet periods on CR signaling may degrade the quality of service (QoS) of the CR network. To solve this problem, active sensing, performing spectrum sensing and transmitting data simultaneously, has been proposed to replace the intra-frame sensing. One drawback of active sensing is that the sensing performance becomes limited due to the interference from CR network transmissions. In this paper, a new CR signal structure for active sensing based on the cyclostationary properties is proposed, with which the active sensing performance can be further improved while maintaining the QoS of the CR system. Simulation results show that the proposed method significantly improves the detection performance of active sensing, especially when the signal strength from PUs is sufficiently low.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128682651","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
Coordinated Control of Tractive and Braking Forces Using High Slip for Improved Turning Performance of an Electric Vehicle Equipped with In-Wheel Motors 基于高滑移的电动汽车牵引与制动力协调控制提高轮毂电机转向性能
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6240288
Wongun Kim, K. Yi
{"title":"Coordinated Control of Tractive and Braking Forces Using High Slip for Improved Turning Performance of an Electric Vehicle Equipped with In-Wheel Motors","authors":"Wongun Kim, K. Yi","doi":"10.1109/VETECS.2012.6240288","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6240288","url":null,"abstract":"This paper describes development of coordinated control of tractive and braking forces using high wheel slip in order to enhance turning performance of electric vehicle equipped with in-wheel motors. In the case of conventional vehicle, turning radius is definitely limited by kinematic features with respect to wheel base, maximum steering angle and track width of the vehicle. Military and special purpose vehicles are required to overcome turning radius limitation in order to conduct urgent and emergency tasks and avoid enemies rapidly. The control purpose is achieved by minimizing lateral tire force of rear wheels using excessive wheel slip condition. It is possible for the vehicle to turn around central turning point using the proposed algorithm. The center turning point is defined based on the driver's intention. The coordinated control algorithm consists of three parts: an upper level controller that computes the desired net force and moment in order to make one point turning motion, a lower level controller distributes tractive and brake input torques of each wheel for excessive slip control and sensor/estimator provides vehicle information to controllers. Computer simulations have been conducted to evaluate performance of the proposed control algorithm. It has been shown from simulation results that turning performance can be significantly improved.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127297296","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
A Reliable Broadcast Transmission Approach Based on Random Linear Network Coding 一种基于随机线性网络编码的可靠广播传输方法
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6239871
Hongkun Xi, Xiaoxiang Wang, Yuan Zhao, Hongtao Zhang
{"title":"A Reliable Broadcast Transmission Approach Based on Random Linear Network Coding","authors":"Hongkun Xi, Xiaoxiang Wang, Yuan Zhao, Hongtao Zhang","doi":"10.1109/VETECS.2012.6239871","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6239871","url":null,"abstract":"Recently, XOR-based network coding has been demonstrated as an effective approach to improve the network performance for wireless broadcast. In this way, the source XOR multiple lost packets from different receivers into one packet and retransmits it, then multiple receivers are able to recover their lost packets, which can effectively reduce the number of retransmissions and utilize wireless bandwidth. However, to find the optimal XOR coding set that minimizes the total number of transmissions has been proved as NP-hard and of high complexity. In this paper, we proposed a new wireless broadcast retransmission scheme based on linear random network coding, in which the source code combines all lost packets to a single one by linear network coding for retransmission, and receivers are able to decode the original packets by method of Gaussian elimination when they receive enough coded-packets. Simulation results are given to demonstrate superior performance of our algorithm over previously proposed works.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127544205","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: 13
Effective Interference Cancellation Mechanisms for D2D Communication in Multi-Cell Cellular Networks 多蜂窝网络中D2D通信的有效干扰消除机制
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6240205
Shaoyi Xu, Haiming Wang, Tao Chen
{"title":"Effective Interference Cancellation Mechanisms for D2D Communication in Multi-Cell Cellular Networks","authors":"Shaoyi Xu, Haiming Wang, Tao Chen","doi":"10.1109/VETECS.2012.6240205","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6240205","url":null,"abstract":"In a Device-to-Device (D2D) underlaying cellular system, interference cancellation is a key problem when uplink spectrums are shared and this problem becomes more complex in a multi-cell cellular network. In this paper, we propose an effective near-far interference avoidance scheme in a multi-cell cellular system. After monitoring the related control channels of a D2D subsystem and exchanging necessary information among neighboring eNBs, an eNB may stop scheduling the interfering cellular devices or facilitate power control mechanisms for the victim D2D users such that the inter-cell near-far interference can be mitigated. Simulations prove that our mechanism is effective and satisfying performance improvement can be obtained.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129912820","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: 41
Compressed Sensing Techniques for Decision Feedback Equalization of Sparse Wireless Channels 稀疏无线信道决策反馈均衡的压缩感知技术
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6240285
Evangelos Vlachos, A. Lalos, Giannis Lionas, K. Berberidis
{"title":"Compressed Sensing Techniques for Decision Feedback Equalization of Sparse Wireless Channels","authors":"Evangelos Vlachos, A. Lalos, Giannis Lionas, K. Berberidis","doi":"10.1109/VETECS.2012.6240285","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6240285","url":null,"abstract":"In this paper new efficient decision feedback equalization (DFE) schemes for channels with long and sparse impulse responses are proposed. It has been shown that under reasonable assumptions concerning the channel impulse response (CIR) coefficients, the feedforward (FF) and feedback (FB) filters may be also approximated by sparse filters. Either the sparsity of the CIR, or the sparsity of the DFE filters may be exploited to derive efficient implementations of the DFE. To this end, compressed sampling (CS) approaches, already successful in system identification settings, can significantly improve the performance of the non sparsity aware DFE. Building on basis pursuit and matching pursuit techniques new DFE schemes are proposed that exhibit considerable computational savings, increased performance properties and short training sequence requirements. To investigate the performance of the proposed schemes the restricted isometry property in the common DFE setup is also investigated.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129921441","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
Angle-Dependent Path Loss Measurements Impacted by Car Body Attenuation in 2.45 Ghz ISM Band 2.45 Ghz ISM频段受车身衰减影响的角相关路径损耗测量
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6240180
M. Blesinger, Thomas Gehrsitz, P. Fertl, E. Biebl, J. Eberspächer, O. Klemp, H. Kellermann
{"title":"Angle-Dependent Path Loss Measurements Impacted by Car Body Attenuation in 2.45 Ghz ISM Band","authors":"M. Blesinger, Thomas Gehrsitz, P. Fertl, E. Biebl, J. Eberspächer, O. Klemp, H. Kellermann","doi":"10.1109/VETECS.2012.6240180","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6240180","url":null,"abstract":"In the past few years more and more wireless applications (e.g. WLAN and Bluetooth) have migrated into the automotive domain. With the increasing number of devices, coexistence investigations in the 2.45 GHz ISM band are gaining importance to enable reliable communications with real time requirements like voice transmission and streaming applications. This paper presents initial results on angle dependent path loss measurements impacted by the influence of a car body on electro-magnetic wave propagation. To this effect, a measurement methodology was developed to gather the attenuation effects of the car according to different antenna positions and measurement angles. Various kinds of attenuation measurements were performed. Vehicle shell attenuation measurements were transformed into angular-dependent path loss metrics and related to vehicle-specific attenuation properties like window inserts, roof columns, trunk or engine hood. Focus of attention was drawn to free space attenuation and intra-vehicle attenuation measurements.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130117743","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: 12
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