2012 IEEE 75th Vehicular Technology Conference (VTC Spring)最新文献_第7页

A Frequency-Domain Sounding Scheme for LTE TDD Beamforming Systems LTE TDD波束形成系统的频域探测方案

2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6239893

Baolong Zhou, Ling-ge Jiang, Shengjie Zhao, Lu Zhang, Chen He, Zhining Jiang, Kun Zhao

{"title":"A Frequency-Domain Sounding Scheme for LTE TDD Beamforming Systems","authors":"Baolong Zhou, Ling-ge Jiang, Shengjie Zhao, Lu Zhang, Chen He, Zhining Jiang, Kun Zhao","doi":"10.1109/VETECS.2012.6239893","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6239893","url":null,"abstract":"In the 3rd generation partnership project (3GPP) long term evolution (LTE) time division duplex (TDD) systems, base stations use uplink sounding reference signals (SRSs) to estimate downlink channel state information (CSI) for downlink beamforming transmissions. Because SRSs sent by up to 8 users are multiplexed on the same time-frequency resources, there exist mutual interferences among these SRSs over fading channels. Thus the current scheme inevitably impacts the estimation accuracy of CSI and thereby degrades the beamforming performance. Based on the characteristics of TDD systems, we propose a novel sounding scheme to improve the quality of CSI, in which according to the CQIs (channel quality indications) periodically reported by each user and the bandwidth requirement of each user, BS schedules each user to send SRSs only on the requisite bandwidth with best CQIs instead of on full bandwidth or specified sub-bandwidth as in the current LTE TDD systems. Simulations show that the proposed scheme outperforms the current scheme in estimation accuracy for various frequency-selective and/or time-selective fading channels, and is especially robust to frequency selective channels. The proposed scheme has been adopted as a candidate scheme for 3GPP LTE-Advanced.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"2011 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":"114915017","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

On Reliable Multicast with Network Coding-ARQ for Relay Cooperation Cells 基于网络编码arq的中继合作小区可靠组播研究

2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6240182

Qingjiao Song, Yonghua Li, Zhiqiang He, Jiaru Lin

{"title":"On Reliable Multicast with Network Coding-ARQ for Relay Cooperation Cells","authors":"Qingjiao Song, Yonghua Li, Zhiqiang He, Jiaru Lin","doi":"10.1109/VETECS.2012.6240182","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6240182","url":null,"abstract":"As a substantial means for improving throughtput, network coding has recently attracted much attention to apply in wireless multicast services. To guarantee the reliable multicast, packet retransmission schemes are employed. With one source, network coding has been well studied for the reliable multicast. But for the multicast cell with two sources, the presented schemes are not good enough to approach an impressive effect with the multiple receivers, demands and link situations. In this paper, for the 2-1-(D1,D2) multicast cell, which has two sources, one relay and two groups users with the receivers numbers of D1 and D2, we propose three schemes to reduce the number of retransmission, which combine the lost packets and retransmit them with network coding, and obtains the least number of retransmissions. Some theoretical results are derived on the bandwidth efficiency of the traditional automatic repeat-request scheme (ARQ), network coding with ARQ scheme (XOR-ARQ) and the improved network coding with ARQ scheme (iXOR-ARQ). Compared with ARQ and XOR-ARQ, iXOR-ARQ is more advantageous on the bandwidth efficiency and the coding gain, which has been confirmed by both simulations and theoretical analysis.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"8 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":"115045861","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: 5

Distance Dependent Call Blocking Probability, and Area Erlang Efficiency of Cellular Networks 蜂窝网络的距离依赖呼叫阻塞概率和区域Erlang效率

2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6240306

S. Batabyal, Suvra Shekhar Das

引用次数: 14

Dynamic Frequency Reservation Scheme for Interference Coordination in LTE-Advanced Heterogeneous Networks LTE-Advanced异构网络中干扰协调的动态频率保留方案

2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6239915

Jun Zhang, Hui Tian, Pengming Tian, Yao Huang, L. Gao

引用次数: 23

Topology-Transparent Distributed Multicast and Broadcast Scheduling in Mobile Ad Hoc Networks 移动自组织网络中拓扑透明分布式组播和广播调度

2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6240223

Yiming Liu, V. Li, Ka-Cheong Leung, Lin Zhang

引用次数: 16

Frequency-Hopping/M-Ary Frequency-Shift Keying Wireless Sensor Network Monitoring Multiple Source Events 跳频/任意移频键控无线传感器网络监测多源事件

2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6240183

Fucheng Yang, Lie-liang Yang

{"title":"Frequency-Hopping/M-Ary Frequency-Shift Keying Wireless Sensor Network Monitoring Multiple Source Events","authors":"Fucheng Yang, Lie-liang Yang","doi":"10.1109/VETECS.2012.6240183","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6240183","url":null,"abstract":"In this contribution, a novel wireless sensor network (WSN) assisted by M-ary frequency-shift keying (MFSK) modulation and frequency-hopping (FH), referred to as the FH/MFSK WSN, is proposed to monitor multiple source events (SEs). In the FH/MFSK WSN, the multiple SEs of each with multiple states are observed by a common group of local sensors (LSNs), each of which observes simultaneously all the SEs. The LSNs convey their decisions through wireless channels to the fusion center (FC) with the aid of MFSK and FH. At the FC, the SEs' states are detected using noncoherent fusion rules. In this contribution, two noncoherent fusion rules are investigated. The first one is the equal gain combining (EGC) fusion rule, while the second one uses both the EGC and iterative interference cancellation (IIC), which is referred to as the EGC-IIC fusion rule. The detection performance of the FH/MFSK WSN employing the proposed EGC or EGC-IIC fusion rule is investigated, when assuming the wireless channels experience independent Rayleigh fading. Our studies show that the FH/MFSK WSN may constitute one of the promising WSN schemes for some special application scenarios. It is capable of monitoring simultaneously multiple SEs of each with multiple states, is low-complexity owing to using the noncoherent fusion rule and, furthermore, is capable of achieving promising detection performance, as it can make use of the diversity in both frequency and space domains.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"16 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":"123937095","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

Efficient Cooperative Spectrum Sensing for Cognitive Wireless Relay Networks over Rayleigh Flat Fading Channels 基于瑞利平坦衰落信道的认知无线中继网络高效协同频谱感知

2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6240171

Quoc-Tuan Vien, H. Tianfield, B. Stewart

{"title":"Efficient Cooperative Spectrum Sensing for Cognitive Wireless Relay Networks over Rayleigh Flat Fading Channels","authors":"Quoc-Tuan Vien, H. Tianfield, B. Stewart","doi":"10.1109/VETECS.2012.6240171","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6240171","url":null,"abstract":"This paper is concerned with cooperative spectrum sensing (CSS) mechanisms in cognitive wireless relay networks (CWRNs). Conventionally, the decision of available spectrum for cognitive radio (CR) users is carried out based on the global decision at a fusion center (FC). In this paper, we propose a new CSS scheme to improve the spectrum sensing performance by exploiting both local decisions at the CR users and global decisions at the FC. Particularly, by deriving the probabilities of missed detection and false alarm for a practical scenario where all sensing, reporting, and backward channels suffer from Rayleigh fading, we show that our proposed CSS scheme achieves an improved sensing performance over the conventional scheme. Furthermore, we propose a CSS scheme based on network coding (NC) for a specific CWRN where the transmission from a source node to a destination node is realized with the aid of two groups of CR users located in the transmission coverage of two primary users (PUs). The proposed NC-based CSS scheme helps reduce one phase of sensing for a higher system throughput compared to the conventional scheme which requires eight phases in total to monitor all available spectrums of both PUs.","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":"123974528","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

Minimum Latency Data Diffusion in Intermittently Connected Mobile Networks 间歇连接移动网络中的最小延迟数据扩散

2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6240236

M. Sathiamoorthy, Wei Gao, B. Krishnamachari, G. Cao

引用次数: 1

Designs of the Monopole Slot Antenna Arrays Operated at the WLAN Band 在WLAN频段工作的单极槽天线阵列设计

2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6239887

Chun-Ming Lin, Yang Tai, K. Hsiao, Chien‐Jen Wang

引用次数: 0

Delta Metric Scheduling for LTE-Advanced Uplink Multi-User MIMO Systems LTE-Advanced上行多用户MIMO系统的增量度量调度

2012 IEEE 75th Vehicular Technology Conference (VTC Spring) Pub Date : 2012-05-06 DOI: 10.1109/VETECS.2012.6240079

Peng Shang, Xudong Zhu, Lu Zhang, Jinsong Wu, Jinhui Chen

{"title":"Delta Metric Scheduling for LTE-Advanced Uplink Multi-User MIMO Systems","authors":"Peng Shang, Xudong Zhu, Lu Zhang, Jinsong Wu, Jinhui Chen","doi":"10.1109/VETECS.2012.6240079","DOIUrl":"https://doi.org/10.1109/VETECS.2012.6240079","url":null,"abstract":"Proportional fair (PF) scheduling algorithm has been extensively utilized in many different systems, since it can support both multi-user diversity and system fairness guarantee. Brute-force searching is the optimal scheduling, pairing and ordering algorithm. However, the optimal brute-force searching method is too computationally prohibitive, especially in case of the large number of users. This paper proposes a novel 2-dimensional grid based scheduling scheme for uplink MU-MIMO transmission using either the conventional proportional fairness metric or delta scheduling metric. Comparing to the scheduling approach using the conventional priority based pairing metric, the proposed scheduling algorithm based on delta scheduling metric could obtain approximate 7% gain for both cell and cell-edge throughput gain with neglectful computational complexity increase. With the aid of successive interference cancellation, MU-MIMO with MMSE-SIC receiver could also improve the cell-edge throughput compared to SU-MIMO. The advantage of the proposed scheme is that it can improve the throughput performance without the sacrifice of the user fairness guarantee.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"50 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":"126161592","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