发布求助
文献互助 智能选刊 最新文献

The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.最新文献

筛选
英文 中文
Performance if transceiving JPEG-2000 images over peer-to-peer wireless link 通过点对点无线链路收发JPEG-2000图像的性能
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359378
Hoang D. Le, Ming Zhao, T.M. Le
{"title":"Performance if transceiving JPEG-2000 images over peer-to-peer wireless link","authors":"Hoang D. Le, Ming Zhao, T.M. Le","doi":"10.1109/ICCS.2004.1359378","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359378","url":null,"abstract":"This paper presents the performance evaluation of transceiving JPEG-2000 image over peer-to-peer wireless links. The latest image codec JPEG-2000 is implemented [2000], and a peer-to-peer transceiver model is established for wireless transmission. The standard test images are compressed by the codec within the transceiver, and subsequently transmitted from peer to peer over IEEE 802.11b wireless LAN (Wi-Fi) [1999] and General Packet Radio Service (GPRS) [1998] networks. For Wi-Fi, due to its substantially high data rate, image transmission time is not as critical. For GPRS, due to the restricted data rate and power resources, it is meaningful to investigate the performance of image transmission over GPRS-involved wireless links. Therefore, in this paper, JPEG-2000 images are compressed in lossy mode and transmitted over GPRS-GPRS and GPRS-Wi-Fi links. Since network usage time and amount of data transferred are cost-determining factors, transmission times for various compression ratios are recorded. Levels of compression can be evaluated using both objective and subjective criteria, yet subjective criteria is more dominant for the smaller screen-size and lower processing power of GPRS-supported devices","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114774600","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
A combined MMSE receiver for high data rate UWB systems 用于高数据速率UWB系统的组合MMSE接收机
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359327
L. Zhiwei, B. Premkumar, A. Madhukumar
{"title":"A combined MMSE receiver for high data rate UWB systems","authors":"L. Zhiwei, B. Premkumar, A. Madhukumar","doi":"10.1109/ICCS.2004.1359327","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359327","url":null,"abstract":"In this paper, an ultra wideband (UWB) receiver is proposed based on optimally combining of multiple minimum mean square error (MMSE) detector outputs. These outputs are obtained by applying shifted observation windows. On one hand, each MMSE detector uses smaller number of taps and can be trained separately. This makes the combined structure suitable for adaptive filter bank implementation and for parallel processing. On the other hand, the system performance is effectively improved by diversity combining. The analysis and simulation results show that the combined MMSE receiver is capable of very high data rate transmission based on IEEE 802.15.3a channel model recommendation (J. Foerster)","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128226659","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
Delay constraint dynamic bandwidth allocation in ethernet passive optical networks 以太网无源光网络中时延约束的动态带宽分配
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359352
Lin Zhang, G. Poo
{"title":"Delay constraint dynamic bandwidth allocation in ethernet passive optical networks","authors":"Lin Zhang, G. Poo","doi":"10.1109/ICCS.2004.1359352","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359352","url":null,"abstract":"Ethernet passive optical network (EPON) is an emerging access network technology that provides a low-cost method of deploying next generation broadband access network. Dynamic bandwidth assignment (DBA) provides statistical multiplexing between the optical network units for upstream channel utilization. To satisfy various QoS requirements, it is important to provide QoS guaranteed network access while utilizing the bandwidth efficiently. We propose a QoS-enabled dynamic bandwidth assignment algorithm for differentiated service in Ethernet passive optical networks. The new DBA algorithm is based on the weights of the different classes and the current queue information to perform better per class bandwidth allocation. The specific QoS requirements of various classes are mapped into deterministic effective bandwidth and then used to assign weights accordingly. We conduct detailed simulation experiments to study the performance and validate the effectiveness of the proposed protocols","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116577345","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
A framework for multiuser detection in time-hopping UWB with randon sign repetition 随机符号重复跳时超宽带多用户检测框架
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359329
Jinho Choi
{"title":"A framework for multiuser detection in time-hopping UWB with randon sign repetition","authors":"Jinho Choi","doi":"10.1109/ICCS.2004.1359329","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359329","url":null,"abstract":"In this paper, we introduce a framework for multiuser detection in time-hopping (TH) ultra-wideband (UWB) systems. Based on this framework, we can derive multiuser detectors. In addition, we can gain insight into TH-UWB and improve the performance by modifying TH-UWB signaling for the multiuser detection. From simulation results, we can observe that there is about 5 dB signal-to-noise ratio (SNR) gain at a bit error rate (BER) of 10-3 when the minimum mean square error (MMSE) detector is used by modifying TH-UWB signaling with random sign repetition","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122116847","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
Reduced-rank adaptive time-domain channel estimation for OFDM systems OFDM系统的降阶自适应时域信道估计
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359354
X. Nguyen, Jinho Choi
{"title":"Reduced-rank adaptive time-domain channel estimation for OFDM systems","authors":"X. Nguyen, Jinho Choi","doi":"10.1109/ICCS.2004.1359354","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359354","url":null,"abstract":"In this paper, we consider a reduced-rank adaptive channel estimation for orthogonal frequency division multiplexing (OFDM) systems. The pilot-aided channel estimation is rawly carried out in the time domain, which is shown to have the better performance compared to the frequency-domain estimator. The adaptive modified least mean square (LMS) algorithm is then applied to further improve the estimates of the channel coefficients. In order to attain lower complexity as well as fast convergence, a reduced-rank technique is also applied to the adaptive algorithm","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"394 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122187126","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
Dynamic bandwidth allocation algorithm for differentiated sservices over WDM EPONs 基于WDM epon的差异化业务动态带宽分配算法
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359350
K. Kwong, D. Harle, Ivan Andonovic
{"title":"Dynamic bandwidth allocation algorithm for differentiated sservices over WDM EPONs","authors":"K. Kwong, D. Harle, Ivan Andonovic","doi":"10.1109/ICCS.2004.1359350","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359350","url":null,"abstract":"A variety of passive optical network (PON) systems has been proposed to target the bottleneck problem in the local access. The medium access controls (MACs) of the PON systems are either based on cyclic rotation or polling mechanism. However, these MACs have inherited a potential problem; the cycle time (or polling cycle in the polling MACs) increases linearly as the number of attached ONUs scale up, which can be caused by increasing customer numbers. The longer cycle time means that the ONUs have to wait longer before the next transmission window arrives thus contributing to longer packet delays and poorer QoS. In this paper, a new WDM PON system is proposed where multiple wavelength channels are established in both upstream and downstream directions. The MAC applied is based on an adaptive polling mechanism, and can be used as an upgrade solution for PON systems","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125863153","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: 78
A model for turbo decoder 一种涡轮解码器模型
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359422
Xiaobo Jiang, Chen Jie, Qiu Yulin
{"title":"A model for turbo decoder","authors":"Xiaobo Jiang, Chen Jie, Qiu Yulin","doi":"10.1109/ICCS.2004.1359422","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359422","url":null,"abstract":"Recently, turbo code has gathered much attention for its outstanding performance. Many literatures have been published on algorithm and applications of turbo code. However, there is little progress on the decoding mechanism of turbo decoder. In this paper we propose an asymmetry AWGN (additive white Gaussian noise channel) model. The proposed model simplified the turbo decoder to an RSC decoder. Through the simulation of the proposed model, two mechanisms of the TURBO decoder have been uncovered. First, turbo decoder improves the S/N (signal to noise) rate of systematic code. Second, turbo decoder improves affection of the systematic code. The simulation result shows that the proposed model is consistent with turbo decoder","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121985783","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
Cancellation of loop interference with exponential profile using autocorrelation method in OFDM based systems 基于OFDM系统的指数型环路干扰的自相关消除
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359355
A. Hazmi, J. Rinne, M. Renfors
{"title":"Cancellation of loop interference with exponential profile using autocorrelation method in OFDM based systems","authors":"A. Hazmi, J. Rinne, M. Renfors","doi":"10.1109/ICCS.2004.1359355","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359355","url":null,"abstract":"This paper discusses the use of the autocorrelation method introduced in A. Hazmi et al. (2002) to cancel multi-tap loop interference with exponential profile in digital terrestrial broadcasting using relays. It was shown that the method can cancel efficiently the coupling between the transmitter and the receiver antennas in the relay station when one tap loop model is considered. Here we modify the autocorrelation method to deal with multi-tap loop with exponential profile. Analytical and experimental results are presented to verify the advantages and the limitations of the method in such environment. Bit error rate simulation results are also considered in AWGN and Rayleigh static channels cases","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130209124","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
A hybrid-slot decentralized control protocol with quality of service for passive optical networks 无源光网络中具有服务质量的混合时隙分散控制协议
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359428
Yang Wei, Cheng Tee Hiang
{"title":"A hybrid-slot decentralized control protocol with quality of service for passive optical networks","authors":"Yang Wei, Cheng Tee Hiang","doi":"10.1109/ICCS.2004.1359428","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359428","url":null,"abstract":"Ethernet-based passive optical network (E-PON) is one of the most promising technology choices for next generation broadband access services, In this paper, we propose a novel media access control (MAC) protocol based on distributed control to enable EPON to provide quality-of-service (QoS) support for various traffic types. This protocol eliminates the process of MAC control messages, which simplifies the network control mechanism. Simulation results show that our proposed scheme outperforms the conventional carrier-sense multiple access with collision detection (CSMA/CD) MAC protocol in terms of packet delay for high priority (HP) traffic. In addition, the proposed scheme has smaller packet delay and larger saturation throughput for low priority (LP) traffic than the fixed time division multiple access (TDMA) scheme and the conventional CSMA/CD scheme","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127751200","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 SISO front-end decoders in IM/DD optical channels with application to turbo code decoding IM/DD光信道SISO前端解码器分析及其在turbo码译码中的应用
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359437
M. Hueda, D. Crivelli, H. Carrer
{"title":"Analysis of SISO front-end decoders in IM/DD optical channels with application to turbo code decoding","authors":"M. Hueda, D. Crivelli, H. Carrer","doi":"10.1109/ICCS.2004.1359437","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359437","url":null,"abstract":"We analyze the log-likelihood ratio (LLR) of the received signal yielded by a soft input/soft output (SISO) front-end decoder, in intensity modulation direct detection (IM/DD) optical channels operating in the presence of amplified spontaneous emission (ASE) noise. We focus on long haul or metro links spanning several hundred kilometers of single mode fibers with optical amplifiers. Unlike in AWGN channels where the LLR is a scaled version of the received sample, our study shows that in IM/DD optical channels with dominant ASE noise the LLR is approximately proportional to the square root of the received signal. Moreover, although Gaussian modeling of the received samples in optical channels has been shown to be inaccurate (e.g., (G. Bosco, et al., 2003), (Y. Cai, et al., 2003)), in this work we show that the LLR yielded by a SISO front-end decoder can be accurately modeled as a Gaussian random variable. Building on this result, we develop an adaptive decoding scheme for block turbo codes (BTC) in IM/DD optical channels. The predictions of our analysis are verified by computer simulations of the bit error rate (BER) for several BTC. Our results also show that the new scheme performs better than previous proposals in transmissions over optical fiber channels","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130481043","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信