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2012 IEEE 75th Vehicular Technology Conference (VTC Spring)最新文献

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Self-Optimisation of Antenna Beam Tilting in LTE Networks LTE网络中天线波束倾斜的自优化
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6240017
R. Razavi
{"title":"Self-Optimisation of Antenna Beam Tilting in LTE Networks","authors":"R. Razavi","doi":"10.1109/VETECS.2012.6240017","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6240017","url":null,"abstract":"This paper introduces a novel technique for self-optimisation of antenna down-tilting. The proposed solution consists of two phases. During the first phase, which needs to be performed quickly, a method based on the Golden Section Search (GSS) algorithm is used to find a near-optimal tilt angle. Then, in the next step, the tilt angle value is fine-tuned through frequent explorations of the near-optimal region. Additionally, the solution benefits from self-healing properties by responding to the failure of a neighbouring cell. In this case, the algorithm is adapted to find a new optimal point upon failure detection. The result shows fast convergence and close-to-optimum performance (93.8% on average) of the proposed algorithm. The overall solution is fully distributed and is 3GPP complaint.","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":"124410522","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: 20
Distance-Aware Routing with Copy Control in Vehicle-Based DTNs 基于车辆的ddn中具有复制控制的距离感知路由
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6239901
Wei-Zen Lo, Jhih-Siao Gao, Shou-Chih Lo
{"title":"Distance-Aware Routing with Copy Control in Vehicle-Based DTNs","authors":"Wei-Zen Lo, Jhih-Siao Gao, Shou-Chih Lo","doi":"10.1109/VETECS.2012.6239901","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6239901","url":null,"abstract":"Delay-Tolerant Networks (DTNs) are special types of network environments that are subject to delays and disruptions. Traditional end-to-end routing fails in DTNs due to intermittent connections. We apply the concept of DTN to vehicular environments, and propose a new routing protocol that applies both diversity and accuracy in routing decisions. Our proposed routing has one excellent feature that supports its use for a distributed location discovery service. We evaluate this routing, using a real street map, in terms of different performance aspects. Experimental results show the superiority of this protocol over other existing ones.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"34 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":"127597301","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: 17
Kalman-Based MIMO Receivers Using Gaussian Sum Approximations 基于高斯和近似的卡尔曼MIMO接收机
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6240192
Dawoon Lee, Sooyong Choi
{"title":"Kalman-Based MIMO Receivers Using Gaussian Sum Approximations","authors":"Dawoon Lee, Sooyong Choi","doi":"10.1109/VETECS.2012.6240192","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6240192","url":null,"abstract":"This paper proposes a new multiple input multiple output receiver based on the Kalman filtering algorithm. The Kalman filtering algorithm is based on the Gaussian assumption of the input signal. However, the assumption is not appropriate for the digital communication system which has non-Gaussian input signal. The proposed receiver overcomes the problem by using multiple Kalman filters and its output is obtained using the weighted sum of the outputs of the Kalman filters by the Gaussian sum approximation method to make the data signal approximately Gaussian. Simulation results show that the bit error rate (BER) performance of the proposed receiver is better than the previous Kalman-based receivers and its BER performance is close to the maximum likelihood (ML) receiver with lower computational complexity than the ML receiver.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"12 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":"127750996","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
Miniaturized MIMO-PIFA with Pattern and Polarization Diversity 具有模式和偏振分集的小型化MIMO-PIFA
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6240235
Soham Ghosh, Thanh-Ngon Tran, T. Le-Ngoc
{"title":"Miniaturized MIMO-PIFA with Pattern and Polarization Diversity","authors":"Soham Ghosh, Thanh-Ngon Tran, T. Le-Ngoc","doi":"10.1109/VETECS.2012.6240235","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6240235","url":null,"abstract":"This paper investigates various designs of 4-element miniaturized Planar Inverted-F Antennas (PIFA) with pattern and polarization diversity at 2.45 GHz. The antennas are only 13mm x 7mm in area and built on a small ground plane size of 105 mm x 55 mm. Diversity performance criteria namely the Envelope Correlation Coefficient (ECC) and Mean Effective Gain (MEG) are computed for different fading channel scenarios using the simulated far-field radiation patterns. Then the Effective Diversity Gain (EDG) of all the configurations under the Maximal Ratio Combining (MRC) scheme are generated. The results show that the antenna systems can give a maximum EDG of 16.31 dB as compared to the theoretical limit of 19.12 dB.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"83 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":"126276442","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
Superposed Band Detection Based on Error Probability Using Initial Likelihood Masking 基于误差概率的初始似然掩蔽叠加带检测
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6240279
T. Ohtsuki, G. Hayashi, Jun Mashino, T. Sugiyama
{"title":"Superposed Band Detection Based on Error Probability Using Initial Likelihood Masking","authors":"T. Ohtsuki, G. Hayashi, Jun Mashino, T. Sugiyama","doi":"10.1109/VETECS.2012.6240279","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6240279","url":null,"abstract":"Superposed multicarrier transmission scheme is known to improve frequency utilization efficiency where several systems share spectrum without any spectrum spreading techniques. In superposed multicarrier transmission scheme forward error correction (FEC) coding is applied over subcarriers so that the effects of interference caused by superposition is mitigated by interleaving effects. When the interference power is large, the effects of FEC become smaller particularly owing to the mis-setting of initial log likelihood ratio (LLR). To solve this problem, FEC metric masking is proposed where initial LLRs for superposed subcarriers are replaced by neutral value in the receiver followed by decoding. This technique is effective, however, it needs the information about superposed frequency band. In this paper we propose a scheme to detect superposed band by using FEC metric masking. In the proposed scheme, the subcarriers where FEC metric masking is applied are changed and packet error rate (PER) is measured. When the FEC metric masking is applied to the superposed subcarriers, PER is minimized. Based on the change of PER, we can detect the superposed band. We evaluate the proposed scheme by computer simulation and show that it can detect the superposed band with high probability.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"26 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":"126371318","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
Performance Analysis of OOK Modulated Signals in the Presence of ADC Quantization Noise ADC量化噪声存在下OOK调制信号的性能分析
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6239905
N. Kiyani, P. Harpe, G. Dolmans
{"title":"Performance Analysis of OOK Modulated Signals in the Presence of ADC Quantization Noise","authors":"N. Kiyani, P. Harpe, G. Dolmans","doi":"10.1109/VETECS.2012.6239905","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6239905","url":null,"abstract":"This paper investigates the word length requirement of an analog-to-digital (ADC) converter for coherent and non-coherent detection of On-Off Keying (OOK) schemes. The paper presents closed-form expressions for coherent and non-coherent detection in terms of bit error rate in the presence of quantization noise (QN) and additive white Gaussian noise (AWGN) channels. The analytical models show that for coherent as well as non-coherent demodulation of OOK schemes in AWGN channels and affected by QN, a 4-bit ADC is able to provide close to optimum performance. As OOK is popularly being employed in event-driven radios, we extend our analysis to these radios. Our analysis shows that for event-driven radios (also referred to as wakeup radios) a 4-bit ADC is able to provide close to optimum performance. Furthermore, in the paper all the analytical models are in close agreement with the simulation results.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"24 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":"128132020","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
Decision-Directed MIMO Channel Tracking with Efficient Error Propagation Mitigation 决策导向MIMO信道跟踪与有效的误差传播抑制
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6239972
Emna Eitel, J. Speidel
{"title":"Decision-Directed MIMO Channel Tracking with Efficient Error Propagation Mitigation","authors":"Emna Eitel, J. Speidel","doi":"10.1109/VETECS.2012.6239972","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6239972","url":null,"abstract":"We treat decision-directed tracking of fast-varying MIMO channels by applying the Kalman filter. The Kalman filter is considered but the suggested algorithm is applicable independently of the tracking technique. In the decision-directed mode, tracking filters suffer from error propagation caused by wrongly detected data. To mitigate the error propagation, a recently suggested pilot on request training is applied. Appropriate metrics to detect the filter divergence were developed in the past but these metrics strongly depend on the tracking algorithm. In this paper, we design a metric which solely depends on the estimated channel. The metric threshold is derived analytically and is shown to be SNR-independent on a large SNR range. We show the effectiveness of the pilot on request training with the novel metric in both reducing the BER and saving bandwidth.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"14 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":"125418758","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
Fuzzy Logic Controllers for Traffic Sharing in Enterprise LTE Femtocells 企业LTE飞蜂窝中业务量共享的模糊逻辑控制器
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6239973
J. M. Ruiz-Aviles, S. Luna-Ramírez, M. Toril, Francisco J. García Ruiz
{"title":"Fuzzy Logic Controllers for Traffic Sharing in Enterprise LTE Femtocells","authors":"J. M. Ruiz-Aviles, S. Luna-Ramírez, M. Toril, Francisco J. García Ruiz","doi":"10.1109/VETECS.2012.6239973","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6239973","url":null,"abstract":"In cellular networks, traffic demand is unevenly distributed both in time and space. This paper investigates the problem of re-distributing traffic demand between Long-Term Evolution (LTE) femtocells in an enterprise scenario. Several traffic sharing algorithms based on automatic tuning of femtocell parameters are considered. The proposed algorithms are implemented by fuzzy logic controllers. Performance assessment is carried out in a dynamic system-level simulator. Results show that tuning handover margins and transmit power can be an effective means to solve localized congestion problems in these scenarios.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"33 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":"127975967","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
Enhanced Multiuser Eigenmode Transmission for Joint Frequency-Spatial Resource Allocation in OFDM-MIMO Downlink Systems OFDM-MIMO下行系统中联合频率空间资源分配的增强型多用户特征模传输
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6240242
Fanglei Sun, Huan Sun, M. You, Tao Yang, Jinhui Chen
{"title":"Enhanced Multiuser Eigenmode Transmission for Joint Frequency-Spatial Resource Allocation in OFDM-MIMO Downlink Systems","authors":"Fanglei Sun, Huan Sun, M. You, Tao Yang, Jinhui Chen","doi":"10.1109/VETECS.2012.6240242","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6240242","url":null,"abstract":"Orthogonal frequency-division multiplexing (OFDM) and multiple-input-multiple-output (MIMO) are two key technologies adopted in future wireless communication systems, such as LTE/LTE-A. There are many papers addressed the resource allocation problems for OFDM and MIMO systems independently. However few discussions targets on the joint frequency-spatial resource allocation problem, particularly on eigenmode scheduling level. In this paper, we try to propose novel resource allocation schemes on eigenmode selection level, with the joint consideration of precoding problem in spatial domain, eigenmode scheduling and power allocation cross spatial and frequency domains.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"75 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":"115816027","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
An Interference Coordination Scheme for Picocell Range Expansion in Heterogeneous Networks 异构网络中皮cell范围扩展的干扰协调方案
2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6240041
Che-Sheng Chiu, Chia-Chi Huang
{"title":"An Interference Coordination Scheme for Picocell Range Expansion in Heterogeneous Networks","authors":"Che-Sheng Chiu, Chia-Chi Huang","doi":"10.1109/VETECS.2012.6240041","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6240041","url":null,"abstract":"Through deploying additional low-power nodes (LPNs) under the coverage area of a macrocell, heterogeneous network (HetNet) or multi-layered network deployments could be critical for operators to boost system capacity (per unit area). In order to extent the coverage region of open access LPNs and hence offload more traffics from macrocells, cell range expansion (CRE) strategy is suggested to apply in HetNets. However, when macrocells and LPNs share the same spectrum, the total network throughput could actually decrease due to CRE if the inter-layer interference couldn't be effectively managed. In this paper, we propose an inter-layer interference coordination scheme on the downlink side for an OFDMA co-channel macro-pico HetNet that carries out CRE technique. The idea of the proposed method is to coordinate frequency and power resources among macrocells and picocells with a set of resource allocation rules. Simulation results show that the proposed method can bring a significant increase in overall system capacity as well as reduce the user outage rate in the system, especially when aggressive CRE is applied.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"76 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":"115939096","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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