2007 Asia-Pacific Conference on Communications最新文献

Evaluation of the QoS control through adaptive modulations and interleaving for WMANs 基于自适应调制和交织的WMANs QoS控制评价

2007 Asia-Pacific Conference on Communications Pub Date : 2007-10-01 DOI: 10.1109/APCC.2007.4433506

Songchar Jiang, H. Lin, S. Tsou, Alex Ku

引用次数: 1

Finding optimized transmission power for clustering of S-MAC protocol in WSNs 寻找WSNs中S-MAC协议聚类的最优传输功率

2007 Asia-Pacific Conference on Communications Pub Date : 2007-10-01 DOI: 10.1109/APCC.2007.4433526

A. Chungtragarn, P. Keeratiwintakorn

引用次数: 4

Application of independent component analysis to lossless compression of 3D ultraspectral sounder data 独立分量分析在三维超声数据无损压缩中的应用

2007 Asia-Pacific Conference on Communications Pub Date : 2007-10-01 DOI: 10.1109/APCC.2007.4433534

Shih-Chieh Wei, Bormin Huang

引用次数: 4

Weighted fairness for flows in wireless mesh networks 无线网状网络中流量的加权公平性

2007 Asia-Pacific Conference on Communications Pub Date : 2007-10-01 DOI: 10.1109/APCC.2007.4433516

S. Gordon, Binh Ngo, A. Jayasuriya

引用次数: 1

Error modeling and throughput analysis in integrated communication and broadcast networks 综合通信和广播网络中的错误建模和吞吐量分析

2007 Asia-Pacific Conference on Communications Pub Date : 2007-10-01 DOI: 10.1109/APCC.2007.4433458

Long Long, A. Ramdorai, Z. Niu

引用次数: 2

Performance and evaluation of adaptive backoff schemes in traffic shaping over high speed network 高速网络流量整形中自适应后退方案的性能与评价

2007 Asia-Pacific Conference on Communications Pub Date : 2007-10-01 DOI: 10.1109/APCC.2007.4433542

S. Lekcharoen

{"title":"Performance and evaluation of adaptive backoff schemes in traffic shaping over high speed network","authors":"S. Lekcharoen","doi":"10.1109/APCC.2007.4433542","DOIUrl":"https://doi.org/10.1109/APCC.2007.4433542","url":null,"abstract":"Traffic shaping mechanism wants smooth traffic but network congestion built up in outgoing at high speed network still occurs when source traffic always becomes at hit the highest point rate. It is causing a lot of non-conforming frames. However, as one way to solving this problem, we purpose a backoff time in leaky bucket over traffic shaping mechanism. Backoff time computations are wildly used in order to avoid the impact on the network performance whenever the increment of offered load arises. The fluctuation of offered load will cause the congestion at waiting room. Furthermore it will lead to or will be close to the deadlock situation as many attempts are there for all-the-time busy service center. The backoff computation will help reduce the repetition of I/O cycles (required to switch task between waiting room to service center) and will prevent the maximum attempts to be reached due to the congested traffic at the waiting room, backoff time computation schemes proposed in this paper are pseudorandom backoff (PB) time, exponential backoff (EB) time and random backoff (RB) time. In pseudorandom backoff (PB) scheme, none of the computation is applicable but the queue discipline. In this paper, the FIFO and the maximum queue size are preset. In exponential backoff (EB) scheme, each node will double the backoff time interval up to the maximum backoff time after each attempt. On the other hand, it will decrease the backoff interval time to the minimum value after a successful attempt. In random backoff (RB) scheme, the delay in queue will be computed randomly, meaning that all frames are to wait in queue until next attempt arises for any random period of time. The performance of three backoff schemes has been investigated by the fluctuation of telecommunication traffic stream (ON/OFF stream). Simulation results indicate that EB and PB help improve performance of network depending on maximum waiting time in queue. Moreover, RB is found to be better regardless to QoS and better if required bandwidth are substantial.","PeriodicalId":282306,"journal":{"name":"2007 Asia-Pacific Conference on Communications","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114622213","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

System optimization from field channel measurement and performance evaluation on future B3G TDD system 从现场信道测量和未来B3G TDD系统性能评估的角度进行系统优化

2007 Asia-Pacific Conference on Communications Pub Date : 2007-10-01 DOI: 10.1109/APCC.2007.4433512

Jianhua Zhang, Guangyi Liu, Weidong Wang

{"title":"System optimization from field channel measurement and performance evaluation on future B3G TDD system","authors":"Jianhua Zhang, Guangyi Liu, Weidong Wang","doi":"10.1109/APCC.2007.4433512","DOIUrl":"https://doi.org/10.1109/APCC.2007.4433512","url":null,"abstract":"FuTURE B3G TDD is designed to provide 100 Mbps peak data rate in both uplink and downlink. In this paper, the MIMO channel measurement campaign carried out in BUPT campus is briefly introduced. Based on the results from the field channel measurement, the radio transmission parameters of physical layer is optimized, and the downlink performance of FuTURE B3G TDD is evaluated in system level with soft frequency reuse and spatial-temporal-frequency scheduling for multiuser zero forcing beamforming, which is designed to explore the multiuser diversity gain at both spatial and frequency domain. As the channel reciprocity can be obtained in TDD system, the Channel State Information (CSI) can be exploited at the transmitter to obtain the spatial-frequency multiuser diversity by joint spatial-frequency subcarrier and antenna assignment of MIMO OFDMA for the independent fading of different user in spatial and frequency domain. With the optimised radio transmission parameters, the peak data rate and system throughput can be improved 12.7%. The downlink system throughput in multi-cell scenario can achieve about 30 Mbps with 4times2 MIMO in 10 MHz bandwidth.","PeriodicalId":282306,"journal":{"name":"2007 Asia-Pacific Conference on Communications","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126311622","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

Face recognition based dog breed classification using coarse-to-fine concept and PCA 基于人脸识别的犬种分类方法

2007 Asia-Pacific Conference on Communications Pub Date : 2007-10-01 DOI: 10.1109/APCC.2007.4433495

M. Chanvichitkul, P. Kumhom, K. Chamnongthai

{"title":"Face recognition based dog breed classification using coarse-to-fine concept and PCA","authors":"M. Chanvichitkul, P. Kumhom, K. Chamnongthai","doi":"10.1109/APCC.2007.4433495","DOIUrl":"https://doi.org/10.1109/APCC.2007.4433495","url":null,"abstract":"Dog breed classification or identification is important for dog training, and curing. The conventional identification method is based on experts which is hard to find. This paper proposes a method to classify dog breed based on the dog face images. The proposed method is based on the coarse to fine concept, where the template matching technique is applied for coarsely classifying the images into 5 groups. Then, within each group, the principle component analysis (PCA) is applied to finely classifying the dog breed. In the PCA- based classification, face features are represented in term of a weight vector. A set of sample image of each dog breed are used for learning the features of the breed. The average weight vectors are stored as the templates of features for breeds after the coarse classification. During the running time after the coarse classification, a dog face image is passed through the PCA to find it vector representation. This vector will then be compared with feature template for each breed in the database. The image under test is classified as the breed that gives the minimum distance between the twp vectors. To evaluate the performance of the proposed method, experiments with 700 dog face images from 35 dog breeds had been performed. Before the testing, 5 dog face images from every breed (totally 175 dog faces) were used to train the system. The experiments showed that the proposed method (coarse classification and PCA for fine classification) gives approximately 93% accuracy which is better than the PCA-based classifier without the coarse classification. The improvement is 16% approximately.","PeriodicalId":282306,"journal":{"name":"2007 Asia-Pacific Conference on Communications","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128107166","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 pilot mapping method for channel-quality estimation in SC-FDMA system 一种新的SC-FDMA信道质量估计导频映射方法

2007 Asia-Pacific Conference on Communications Pub Date : 2007-10-01 DOI: 10.1109/APCC.2007.4433437

Dae-Hong Lee, Se-Bin Im, Hyung-Jin Choi

引用次数: 1

A new PAPR reduction in OFDM-WLAN systems by hybrid algorithm of PTS and APPR methods 基于PTS和APPR混合算法的OFDM-WLAN系统PAPR降低新方法

2007 Asia-Pacific Conference on Communications Pub Date : 2007-10-01 DOI: 10.1109/APCC.2007.4433523

C. Pradabpet, S. Yoshizawa, Y. Miyanaga, K. Dejhan

引用次数: 10