2011 11th International Symposium on Communications & Information Technologies (ISCIT)最新文献_第10页

Distributed fair resource allocation in wireless multi-user multi-relay networks with heterogeneous rate constraints 异构速率约束下无线多用户多中继网络的分布式公平资源分配

2011 11th International Symposium on Communications & Information Technologies (ISCIT) Pub Date : 2011-12-01 DOI: 10.1109/ISCIT.2011.6089948

Yanyan Shen, G. Feng, Bo Yang, X. Guan

引用次数: 4

Proposal on the concealment of the network topology in IPv6 IPv6中网络拓扑隐藏问题的研究

2011 11th International Symposium on Communications & Information Technologies (ISCIT) Pub Date : 2011-12-01 DOI: 10.1109/ISCIT.2011.6092167

Toru Kuboshiki, Hidekazu Suzuki, A. Watanabe

引用次数: 0

Dynamic traffic prioritization scheme for multihop tactical networks 多跳战术网络的动态流量优先级方案

2011 11th International Symposium on Communications & Information Technologies (ISCIT) Pub Date : 2011-12-01 DOI: 10.1109/ISCIT.2011.6089960

Dongho Lee, Kwangsung Ju, K. Chung

引用次数: 0

Robust blind beamforming algorithm via the oblique projection method 斜投影法鲁棒盲波束形成算法

2011 11th International Symposium on Communications & Information Technologies (ISCIT) Pub Date : 2011-12-01 DOI: 10.1109/ISCIT.2011.6092166

Xin Song, Jinkuan Wang, Qiuming Li, Jingguo Ren, Han Wang

引用次数: 0

A collision detection method based on power sensing and time-domain signal processing for wireless LAN 基于功率感知和时域信号处理的无线局域网碰撞检测方法

2011 11th International Symposium on Communications & Information Technologies (ISCIT) Pub Date : 2011-12-01 DOI: 10.1109/ISCIT.2011.6089730

Peng Shao, A. Matsumoto, S. Aust, Tetsuya Ito, P. Davis

{"title":"A collision detection method based on power sensing and time-domain signal processing for wireless LAN","authors":"Peng Shao, A. Matsumoto, S. Aust, Tetsuya Ito, P. Davis","doi":"10.1109/ISCIT.2011.6089730","DOIUrl":"https://doi.org/10.1109/ISCIT.2011.6089730","url":null,"abstract":"Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) access control protocol is used in the wireless LAN (WLAN) to suppress interferences. According to the CSMA/CA, if the transmitter does not receive an acknowledgment (ACK) control frame from the receiver after transmission, it will assume the previous transmission has failed and repeat the transmission. In order to evaluate the transmission channel and optimize the transmission parameters for improving the efficiency of data transmission it is necessary to distinguish the reason for transmission failure — collisions or attenuation in the transmission channel. Some enhanced collision detection methods for IEEE 802.11 WLAN have been proposed. In these schemes, the exchange of detection information is necessary, which could lead to additional collisions. So the detection information itself might not be received correctly due to collisions. In this paper, we propose a novel collision detection method, based on signal power sensing and time-domain signal processing, for transmitting stations in WLAN, which does not require the feedback of information from the receiver. With the calculation of collision frequency, the transmission parameters can be adjusted to improve the efficiency of data transmission. The effectiveness of the proposed collision detection method is verified in an experiment.","PeriodicalId":226552,"journal":{"name":"2011 11th International Symposium on Communications & Information Technologies (ISCIT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116439105","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

Constructing (k, r)-connected dominating sets for robust backbone in wireless sensor networks 构造无线传感器网络鲁棒骨干(k, r)连通支配集

2011 11th International Symposium on Communications & Information Technologies (ISCIT) Pub Date : 2011-12-01 DOI: 10.1109/ISCIT.2011.6089724

Chan Zheng, Yiqing Zhang, Ling Yin

引用次数: 6

Coordinated multi-point transmission with limited feedback for LTE-advanced LTE-advanced有限反馈协调多点传输

2011 11th International Symposium on Communications & Information Technologies (ISCIT) Pub Date : 2011-12-01 DOI: 10.1109/ISCIT.2011.6092185

Yan Li, J. Ge, Cheng Shen, Jing Li, Wang Miao

{"title":"Coordinated multi-point transmission with limited feedback for LTE-advanced","authors":"Yan Li, J. Ge, Cheng Shen, Jing Li, Wang Miao","doi":"10.1109/ISCIT.2011.6092185","DOIUrl":"https://doi.org/10.1109/ISCIT.2011.6092185","url":null,"abstract":"Coordinated Multi-Point transmission (CoMP) has been recognized as one of the most promising technologies in the 4th generation (4G) cellular systems. It can significantly increase the spectral efficiency by combining the data from different eNBs. However, the benefits come at the cost of the increased feedback overhead. In the downlink frequency division duplex (FDD) systems, UEs need to feedback their channel state information (CSI) to the eNBs. As the feedback channel is limited, the quantization of the channel coefficients is necessary. In the conventional noncooperative networks, the feedback overhead can be reduced by allowing UEs with good channel qualities to feedback their CSIs, which is known as the selective feedback. In this paper, we extend this scheme to CoMP systems by the introduction of concatenated codebook. Since the quantization of the channel will result in quantization error, we define a new method to calculate the received SNRs from a specific channel taking quantization error into account. Based on this new method, UEs with weak link would not feedback the CSIs to the cooperative eNBs, which reduces the feedback overhead. We also derive the closed-form expression for the feedback overhead in terms of the SNR threshold. Finally, numerical simulations are provided to prove the effectiveness of our new method.","PeriodicalId":226552,"journal":{"name":"2011 11th International Symposium on Communications & Information Technologies (ISCIT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125380542","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

A novel MIMO relay FM-DCSK UWB system for low-rate and low-power WPAN applications 一种新型的MIMO中继FM-DCSK UWB系统，用于低速率和低功耗WPAN应用

2011 11th International Symposium on Communications & Information Technologies (ISCIT) Pub Date : 2011-12-01 DOI: 10.1109/ISCIT.2011.6089721

Yi Fang, Shaohua Hong, L. Wang

引用次数: 3

Design and analysis of a MAC protocol for wireless body area network using wakeup radio 基于唤醒无线电的无线体域网络MAC协议设计与分析

2011 11th International Symposium on Communications & Information Technologies (ISCIT) Pub Date : 2011-12-01 DOI: 10.1109/ISCIT.2011.6089719

M. A. Ameen, N. Ullah, K. Kwak

引用次数: 25

Human action recognition using direction histograms of optical flow 基于光流方向直方图的人体动作识别

2011 11th International Symposium on Communications & Information Technologies (ISCIT) Pub Date : 2011-12-01 DOI: 10.1109/ISCIT.2011.6089701

Kanokphan Lertniphonphan, S. Aramvith, T. Chalidabhongse

{"title":"Human action recognition using direction histograms of optical flow","authors":"Kanokphan Lertniphonphan, S. Aramvith, T. Chalidabhongse","doi":"10.1109/ISCIT.2011.6089701","DOIUrl":"https://doi.org/10.1109/ISCIT.2011.6089701","url":null,"abstract":"Recognizing human actions is a challenging research area due to the complexity and variation of human's appearances and postures, the variation of camera settings, and angles. In this paper, we introduce a motion descriptor based on direction of optical flow for human action recognition. The directional value of a silhouette is divided into small regions. In each region, the normalized direction histogram of optical flow is computed. The motion vector is the values of a histogram in every region respective concatenation. The vectors are smoothed in time domain by moving average to reduce the motion variation and noise. For the training process, the motion vectors of the training set are clustered by K-mean to represent action. The clustered data group the similar posture together and is represented by the cluster centers. The centers are used to compare input frames by computing distance and using K-nearest neighbor to classify action. The experimental results show that K-mean clustering can group the similar pose together. The motion feature can be used to classify action in a low resolution image with a small number of reference vectors.","PeriodicalId":226552,"journal":{"name":"2011 11th International Symposium on Communications & Information Technologies (ISCIT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114691732","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: 29