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Subspace-Based Blind Channel Estimation for MIMO-OFDM Systems with New Signal Permutation Method 基于子空间的MIMO-OFDM系统盲信道估计新信号置换方法
2014 IEEE 79th Vehicular Technology Conference (VTC Spring) Pub Date : 2014-05-18 DOI: 10.1109/VTCSpring.2014.7023113
Shih-Hao Fang, Ju-Ya Chen, Jing-Shiun Lin, Ming-Der Shieh, Jen-Yuan Hsu
{"title":"Subspace-Based Blind Channel Estimation for MIMO-OFDM Systems with New Signal Permutation Method","authors":"Shih-Hao Fang, Ju-Ya Chen, Jing-Shiun Lin, Ming-Der Shieh, Jen-Yuan Hsu","doi":"10.1109/VTCSpring.2014.7023113","DOIUrl":"https://doi.org/10.1109/VTCSpring.2014.7023113","url":null,"abstract":"Subspace-based blind channel estimation for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems with repetition index has been proposed in the literature. However, the full-row-rank probability of the signal matrix using the MIMO-based repetition index method is extremely low, especially when low-order modulation or few received OFDM symbols are used. In this paper, the MIMO-based repetition index method with a new signal permutation method is proposed. The proposed method solves the problem of previous MIMO-based repetition index method. Additionally, the proposed method performs well even if low-order modulation or few revived OFDM symbols are applied. Simulation results show that proposed method not only has high full-row-rank probability, but also outperforms conventional blind channel estimation approaches in terms of normalized mean-square error (NMSE).","PeriodicalId":405517,"journal":{"name":"2014 IEEE 79th Vehicular Technology Conference (VTC Spring)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123550207","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
Capacity Upper Bound for Adding Cells in the Super Dense Cellular Deployment Scenario 超密集蜂窝部署场景下扩容容量上限
2014 IEEE 79th Vehicular Technology Conference (VTC Spring) Pub Date : 2014-05-18 DOI: 10.1109/VTCSpring.2014.7022852
Yi Wu, P. Butovitsch, Meng Zhang
{"title":"Capacity Upper Bound for Adding Cells in the Super Dense Cellular Deployment Scenario","authors":"Yi Wu, P. Butovitsch, Meng Zhang","doi":"10.1109/VTCSpring.2014.7022852","DOIUrl":"https://doi.org/10.1109/VTCSpring.2014.7022852","url":null,"abstract":"In this paper, we investigate a super dense cellular deployment case in which the cells are continuously added in order to increase the total network capacity. The effect of the other cell interference in the HSPA network is analyzed, which provides an insight into the aggregated interference impact on the cell capacity. The network capacity performance with varying cell densities has been studied with system-level simulations. The results show that there is an upper bound existing for the total HSDPA downlink capacity when continuously adding cells within an open area. This paper can serve as essential guidelines both for macro cell densification and small cell deployment. It is recommended that careful considerations need to be taken if an operator intends to improve network performance by adding cells to their networks in dense urban cities.","PeriodicalId":405517,"journal":{"name":"2014 IEEE 79th Vehicular Technology Conference (VTC Spring)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122024618","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
Maximum Residual Energy Routing in Wastage-Aware Energy Harvesting Wireless Sensor Networks 损耗感知能量收集无线传感器网络中的最大剩余能量路由
2014 IEEE 79th Vehicular Technology Conference (VTC Spring) Pub Date : 2014-05-18 DOI: 10.1109/VTCSpring.2014.7022982
Gina Martinez, Shufang Li, Chi Zhou
{"title":"Maximum Residual Energy Routing in Wastage-Aware Energy Harvesting Wireless Sensor Networks","authors":"Gina Martinez, Shufang Li, Chi Zhou","doi":"10.1109/VTCSpring.2014.7022982","DOIUrl":"https://doi.org/10.1109/VTCSpring.2014.7022982","url":null,"abstract":"Traditional battery-powered sensor networks suffer from the inevitable lifetime limit due to the finite capacity of batteries. Energy harvesting WSN systems can provide a sustainable solution, however, the energy harvest properties need to be incorporated into the network design. In this paper, we consider the incorporation of energy-harvesting hardware, such as Photovoltaic (PV) panels, into the sensor nodes to augment the initial energy supply and to prolong or potentially achieve unlimited lifetime. In addition to accounting for node residual battery levels and forecast energy harvest, we propose a route selection scheme that takes into account the predicted wastage due to overcharge of finite battery, which has not been previously considered. We show in the simulation results that higher total residual energy can be achieved by considering energy harvest wastage into the routing decisions.","PeriodicalId":405517,"journal":{"name":"2014 IEEE 79th Vehicular Technology Conference (VTC Spring)","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124167400","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
Use of Coordinated Multipoint Transmission for Relaxation of Relay Link Bottlenecks 使用协调多点传输缓解中继链路瓶颈
2014 IEEE 79th Vehicular Technology Conference (VTC Spring) Pub Date : 2014-05-18 DOI: 10.1109/VTCSpring.2014.7023136
B. B. Haile, E. Mutafungwa, Jyri Hämäläinen
{"title":"Use of Coordinated Multipoint Transmission for Relaxation of Relay Link Bottlenecks","authors":"B. B. Haile, E. Mutafungwa, Jyri Hämäläinen","doi":"10.1109/VTCSpring.2014.7023136","DOIUrl":"https://doi.org/10.1109/VTCSpring.2014.7023136","url":null,"abstract":"The emerging Long Term Evolution-Advanced (LTE-A) standard promises improvements in throughput and reduction in costs-per-bit, through use of techniques, such as, relaying and coordinated multipoint (CoMP) transmission and reception. The inherent self-backhauling of relays nodes makes them an attractive solution in areas where backhaul is either unavailable or costly. However, the performance of the backhaul relay link limits overall performance of relay systems, particularly for relays deployed in the cell edge. In this paper, we propose CoMP-enhancements in order to relax the relay link bottleneck. We study this proposed approach through system simulations of a selected realistic deployment scenario. The results demonstrate that use of a quantized co-phasing (QCP) CoMP technique provides significant signal- to-interference-plus- noise-ratio (SINR) gains and end-to-end throughput improvements for user equipment connected to the relays, even with simple scheduling techniques.","PeriodicalId":405517,"journal":{"name":"2014 IEEE 79th Vehicular Technology Conference (VTC Spring)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124228257","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
Validation of an Inter-Cell Interference Coordination Solution in Real-World Deployment Conditions 实际部署条件下小区间干扰协调解决方案的验证
2014 IEEE 79th Vehicular Technology Conference (VTC Spring) Pub Date : 2014-05-18 DOI: 10.1109/VTCSpring.2014.7023141
Oscar Tonelli, Ignacio Rodriguez, Gilberto Berardinelli, A. Cattoni, Jakob L. Buthler, T. B. Sørensen, P. Mogensen
{"title":"Validation of an Inter-Cell Interference Coordination Solution in Real-World Deployment Conditions","authors":"Oscar Tonelli, Ignacio Rodriguez, Gilberto Berardinelli, A. Cattoni, Jakob L. Buthler, T. B. Sørensen, P. Mogensen","doi":"10.1109/VTCSpring.2014.7023141","DOIUrl":"https://doi.org/10.1109/VTCSpring.2014.7023141","url":null,"abstract":"The characteristics of the deployment scenario are fundamental elements in the performance evaluation of wireless networks inter-cell interference coordination (ICIC) schemes. The statistical validation of such concepts is typically achieved by means of system-level simulation campaigns where regular reference scenarios and stochastic channel models are employed. It is an important next step to verify that the trends observed in the reference scenarios compare equally well in more practical deployments. For such comparison, it is required to evaluate an extensive set of link conditions, reflecting the many possible configurations that can be experienced in a practical scenario. In this paper we adopt an experimental procedure, using a software defined radio testbed, for acquiring almost 1000 different radio link conditions between the nodes of a relevant wireless indoor network scenario. The acquired measurements, were used as input to a system level simulator in order to evaluate the performance of a local area decentralized ICIC scheme. The obtained performance results highlight the contribution of the selected scheme and provide a new insight for the validation of the related simulation-based studies, previously published in literature.","PeriodicalId":405517,"journal":{"name":"2014 IEEE 79th Vehicular Technology Conference (VTC Spring)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126188958","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
Spreading Sequence Design for Partial Connectivity Relay Network 部分连通性中继网络的扩展序列设计
2014 IEEE 79th Vehicular Technology Conference (VTC Spring) Pub Date : 2014-05-18 DOI: 10.1109/VTCSpring.2014.7023109
Jie Yang, Kanghee Lee, Shuang Feng, H. Kwon
{"title":"Spreading Sequence Design for Partial Connectivity Relay Network","authors":"Jie Yang, Kanghee Lee, Shuang Feng, H. Kwon","doi":"10.1109/VTCSpring.2014.7023109","DOIUrl":"https://doi.org/10.1109/VTCSpring.2014.7023109","url":null,"abstract":"This paper considers a downlink relay network where source communicates with the receivers through relays under frequency-selective fading channels. A spreading sequence design scheme, which is subjected to maximizing the signal-to-interference- plus-noise ratio (SINR) is proposed. It is shown through simulations that a better bit error rate (BER) can be achieved using this proposed scheme. The sensitivity of the proposed scheme to channel uncertainty and broadband noise jamming is also examined.","PeriodicalId":405517,"journal":{"name":"2014 IEEE 79th Vehicular Technology Conference (VTC Spring)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126039636","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
Analysis of a Call Admission Control Algorithm for Real-Time Traffic in OFDMA Based Cellular Networks 基于OFDMA的蜂窝网络实时业务的呼叫接纳控制算法分析
2014 IEEE 79th Vehicular Technology Conference (VTC Spring) Pub Date : 2014-05-18 DOI: 10.1109/VTCSpring.2014.7022829
S. Batabyal, Suvra Shekhar Das
{"title":"Analysis of a Call Admission Control Algorithm for Real-Time Traffic in OFDMA Based Cellular Networks","authors":"S. Batabyal, Suvra Shekhar Das","doi":"10.1109/VTCSpring.2014.7022829","DOIUrl":"https://doi.org/10.1109/VTCSpring.2014.7022829","url":null,"abstract":"In Orthogonal Frequency Division Multiple Access (OFDMA) networks there is variation of Grade of Service (GoS) experienced by the users within a cell. Hence a comprehensive performance analysis for such networks must include fairness of GoS considerations. Methods to enhance fairness of GoS include call admission control (CAC) schemes. A simple dynamic CAC scheme that responds to the bandwidth occupancy level is considered here. It leverages the fact that several regions within the cell offer a GoS that is much higher than acceptable. Users from such regions may be blocked even when sufficient resources are available, a technique which we refer to as forced blocking. Such forced blocking of GoS rich users, if performed at times of high bandwidth occupancy, may enable to improve the GoS of the remaining users. However, the rate of application of forced blocking to any class of users must be chosen such that the GoS of that class does not degrade beyond an acceptable limit. The performance of such an algorithm is studied in terms of parameters such as satisfied service area of the cell, min-max metric of fairness, variance of GoS and cell-average as well as cell-edge GoS. Both discrete event simulations (DES) and analytical models are employed in this performance study, for which First Come First Served (FCFS) performance serves as the reference.","PeriodicalId":405517,"journal":{"name":"2014 IEEE 79th Vehicular Technology Conference (VTC Spring)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129948168","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
Optimized Channel Estimation for OFDMA Uplink with Frequency-Dependent I/Q Imbalance 频率相关I/Q不平衡OFDMA上行链路的优化信道估计
2014 IEEE 79th Vehicular Technology Conference (VTC Spring) Pub Date : 2014-05-18 DOI: 10.1109/VTCSpring.2014.7023031
Pranav Sakulkar, A. Ishaque, G. Ascheid
{"title":"Optimized Channel Estimation for OFDMA Uplink with Frequency-Dependent I/Q Imbalance","authors":"Pranav Sakulkar, A. Ishaque, G. Ascheid","doi":"10.1109/VTCSpring.2014.7023031","DOIUrl":"https://doi.org/10.1109/VTCSpring.2014.7023031","url":null,"abstract":"I/Q imbalance (IQI) is one of the major front-end imperfections affecting the performance of communication systems. Due to frequency-dependent (FD) IQI, channel is elongated and is split into direct and image channels. We consider the problem of joint estimation of the channel and I/Q parameters for OFDM based systems. Time-domain estimation of the effective channel taps poses a question: what is the optimal number of taps that need to be estimated for the best estimation performance? More the estimated taps, more is the noise contribution to the estimator. Lesser the estimated taps, less is the precision due to unestimated taps. In this paper, we address this issue by deriving analytic expressions for mean squared errors (MSE) of estimates of the effective channels and conditions for their optimization. In the absence of channel knowledge, we propose a choice of number of taps to improve estimation performance.","PeriodicalId":405517,"journal":{"name":"2014 IEEE 79th Vehicular Technology Conference (VTC Spring)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130031213","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
Linear Transceiver Design for MIMO Relay Broadcast Channels with Max-Min Fairness 具有最大最小公平性的MIMO中继广播信道线性收发器设计
2014 IEEE 79th Vehicular Technology Conference (VTC Spring) Pub Date : 2014-05-18 DOI: 10.1109/VTCSPRING.2014.7022971
E. Monroy, Sunghyun Choi
{"title":"Linear Transceiver Design for MIMO Relay Broadcast Channels with Max-Min Fairness","authors":"E. Monroy, Sunghyun Choi","doi":"10.1109/VTCSPRING.2014.7022971","DOIUrl":"https://doi.org/10.1109/VTCSPRING.2014.7022971","url":null,"abstract":"The multiple-input multiple-output relay broadcast channel with one source, one relay, and two destinations is studied. It is assumed that the source and the relay cooperatively serve one of two destinations, which may have a weaker channel from the source (due to, for example, being located far from the source), while the source alone serves the other destination that has a stronger channel. Given the asymmetry in the use of the relay as well as in the channel strengths, the performance of the system is evaluated through the minimum of the rates for the two destinations instead of the sum of the rates. A new linear transmit and receive beamforming scheme is proposed for this max-min fairness problem that can be implemented in practical scenarios. Numerical results show that the proposed scheme yields a significant gain over existing schemes.","PeriodicalId":405517,"journal":{"name":"2014 IEEE 79th Vehicular Technology Conference (VTC Spring)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131254825","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
On the Performance of Doubly-Selective Fading Estimations in High Mobility Systems 高迁移率系统中双选择衰落估计的性能研究
2014 IEEE 79th Vehicular Technology Conference (VTC Spring) Pub Date : 2014-05-18 DOI: 10.1109/VTCSpring.2014.7023018
Ning Sun, Jingxian Wu
{"title":"On the Performance of Doubly-Selective Fading Estimations in High Mobility Systems","authors":"Ning Sun, Jingxian Wu","doi":"10.1109/VTCSpring.2014.7023018","DOIUrl":"https://doi.org/10.1109/VTCSpring.2014.7023018","url":null,"abstract":"This paper studies the theoretical performance of channel estimations in high mobility wireless communication systems operating with doubly-selective (both time-selective and frequency-selective) fading. High mobility communications result in fast time-selective fading with a Doppler spread as high as a few kilo-Hertz. The fast fading variation can be estimated and tracked with pilot-assisted minimum mean squared error (MMSE) channel estimation. The percentage of pilot symbols among the transmitted symbols plays a critical role. A higher pilot percentage can lead to a better channel estimation, but also more overhead. The impacts of the pilot percentage on channel estimations are identified through the derivation of the asymptotic mean squared error (MSE) of channel estimations. The results are expressed as a closed-form expression of various system parameters, including the pilot percentage, the maximum Doppler spread, the signal-to-noise ratio (SNR), etc.","PeriodicalId":405517,"journal":{"name":"2014 IEEE 79th Vehicular Technology Conference (VTC Spring)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127636822","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
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