发布求助
文献互助 智能选刊 最新文献

2008 IEEE International Symposium on Wireless Communication Systems最新文献

筛选
英文 中文
Improving the MAC layer performance of Ad Hoc Networks by congestion control algorithms 利用拥塞控制算法提高Ad Hoc网络的MAC层性能
2008 IEEE International Symposium on Wireless Communication Systems Pub Date : 2008-12-30 DOI: 10.1109/ISWCS.2008.4726016
Sichao Ruan, Cong Wang, T. Lee
{"title":"Improving the MAC layer performance of Ad Hoc Networks by congestion control algorithms","authors":"Sichao Ruan, Cong Wang, T. Lee","doi":"10.1109/ISWCS.2008.4726016","DOIUrl":"https://doi.org/10.1109/ISWCS.2008.4726016","url":null,"abstract":"Wireless Ad Hoc Networks have experienced great improvement over the past decade. However, IEEE 802.11 DCF, as the standard for Ad Hoc Networks, is still greatly influenced by hidden and exposed node problems. Lots of researches have been performed to solve them, but only a few of them have addressed the tradeoff between the two problems. This paper tries to balance the two problems by distributed terminal coordination. We will present two MAC schemes that import the concept of congestion control algorithms. A model between carrier sensing range and congestion window size is established. According to the simulation results, it is shown that these schemes can achieve good MAC layer performance in terms of one-hop throughput, fairness and speed of throughput convergence.","PeriodicalId":158650,"journal":{"name":"2008 IEEE International Symposium on Wireless Communication Systems","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131411718","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
Balancing power saving and single user experience with discontinuous reception in LTE 在LTE的不连续接收中平衡省电和单用户体验
2008 IEEE International Symposium on Wireless Communication Systems Pub Date : 2008-12-30 DOI: 10.1109/ISWCS.2008.4726149
T. Kolding, J. Wigard, Lars Dalsgaard
{"title":"Balancing power saving and single user experience with discontinuous reception in LTE","authors":"T. Kolding, J. Wigard, Lars Dalsgaard","doi":"10.1109/ISWCS.2008.4726149","DOIUrl":"https://doi.org/10.1109/ISWCS.2008.4726149","url":null,"abstract":"The UTRAN long-term evolution (LTE) provides flexible means to achieve micro-sleep operation for user equipment (UE) even though it is in active mode and running a service. By means of a discontinuous reception (DRX) framework pauses in transmission due to natural traffic characteristics or network prioritization can be utilized. However, the optimum setting of parameters must be provided as a compromise among reaction latency, user throughput, power consumption, and network performance. Using a realistic RF modem power consumption model for the UE, we investigate different algorithms for optimizing the balance among user throughput and power saving using a Web-browsing session as the reference. We show that with proper configuration of the DRX parameters we can optimally achieve a 95% reduction of the UE power consumption with only a moderate and acceptable 10-20% loss of experienced throughput.","PeriodicalId":158650,"journal":{"name":"2008 IEEE International Symposium on Wireless Communication Systems","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127047896","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: 68
On the performance and the optimization of LDPC codes on fading channels with imperfect CSI 不完全信道下LDPC码的性能及优化研究
2008 IEEE International Symposium on Wireless Communication Systems Pub Date : 2008-12-30 DOI: 10.1109/ISWCS.2008.4726114
A. Benvegnu, Samuele Bandi, V. Tralli
{"title":"On the performance and the optimization of LDPC codes on fading channels with imperfect CSI","authors":"A. Benvegnu, Samuele Bandi, V. Tralli","doi":"10.1109/ISWCS.2008.4726114","DOIUrl":"https://doi.org/10.1109/ISWCS.2008.4726114","url":null,"abstract":"In this article we investigate low-density paritycheck (LDPC) codes for fast Rayleigh fading channels in the presence of channel estimation error. The analysis is carried out using the density evolution technique assuming a belief propagation (BP) decoder. After having derived the analytical framework for decoding analysis, we prove that there exists a simple approximated relationship, function of estimation error variance, between the signal-to-noise ratio thresholds in the two cases of perfect and imperfect channel state information (CSI). This approximation follows the exact computation tightly, when the variance of the estimation error is sufficiently smaller than the fading variance. As a result, optimized codes for perfect CSI are also approximately optimized for imperfect CSI.","PeriodicalId":158650,"journal":{"name":"2008 IEEE International Symposium on Wireless Communication Systems","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114486624","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
Determining 802.11 link quality with passive measurements 通过被动测量确定802.11链路质量
2008 IEEE International Symposium on Wireless Communication Systems Pub Date : 2008-12-30 DOI: 10.1109/ISWCS.2008.4726152
Daniel Wu, P. Djukic, P. Mohapatra
{"title":"Determining 802.11 link quality with passive measurements","authors":"Daniel Wu, P. Djukic, P. Mohapatra","doi":"10.1109/ISWCS.2008.4726152","DOIUrl":"https://doi.org/10.1109/ISWCS.2008.4726152","url":null,"abstract":"Unlike a wired link, a wireless link changes according to the physical environment and the network traffic in the surrounding area. The link quality, capacity and reliability are dependent on the MAC layer parameters and the channel conditions. In this work, we present a new passive link quality measurement tool and study the effects of modulation rate changes, interflow and intraflow interferences on the wireless link. We observe the channel conditions (RSSI in both directions), retries, and various basic metrics to determine their usefulness in certain conditions. We found that RSSI is not a good metric for link quality since it does not correlate with the measured throughput. Other factors, such as modulation rate settings and the topology setups are also detailed in this paper.","PeriodicalId":158650,"journal":{"name":"2008 IEEE International Symposium on Wireless Communication Systems","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114903785","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: 22
Co-phasing full-duplex relay link with non-ideal feedback information 具有非理想反馈信息的同相全双工中继链路
2008 IEEE International Symposium on Wireless Communication Systems Pub Date : 2008-12-30 DOI: 10.1109/ISWCS.2008.4726058
T. Riihonen, R. Wichman, Jyri Hämäläinen
{"title":"Co-phasing full-duplex relay link with non-ideal feedback information","authors":"T. Riihonen, R. Wichman, Jyri Hämäläinen","doi":"10.1109/ISWCS.2008.4726058","DOIUrl":"https://doi.org/10.1109/ISWCS.2008.4726058","url":null,"abstract":"We study a wireless full-duplex amplify-and-forward relay link where a destination receives superposition of relayed and direct signals. We propose a new relay protocol that performs co-phasing of the two paths. We analyze the performance of the relay link by calculating closed-form expressions for the average end-to-end signal-to-noise ratio assuming flat Nakagami-m fading channels and by simulating the outage capacity. In the analysis, the phase feedback information is considered non-ideal due to Nph bit quantization and bit error probability ¿. We show that full-duplex relaying can offer performance improvement over both direct transmission and half-duplex relaying even with few feedback bits and with a feedback channel of relatively low quality.","PeriodicalId":158650,"journal":{"name":"2008 IEEE International Symposium on Wireless Communication Systems","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123936771","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: 20
Channel aware scheduling in MIMO based WLANs in the presence of channel uncertainty 基于MIMO的无线局域网中存在信道不确定性的信道感知调度
2008 IEEE International Symposium on Wireless Communication Systems Pub Date : 2008-12-30 DOI: 10.1109/ISWCS.2008.4726087
J. Mirkovic, B. Walke, Jordi Gomez Garcia
{"title":"Channel aware scheduling in MIMO based WLANs in the presence of channel uncertainty","authors":"J. Mirkovic, B. Walke, Jordi Gomez Garcia","doi":"10.1109/ISWCS.2008.4726087","DOIUrl":"https://doi.org/10.1109/ISWCS.2008.4726087","url":null,"abstract":"In this paper system level performance evaluation of channel aware schedulers that apply previously presented multiple input-multiple output (MIMO) link adaptation algorithms is given. The analyzed schedulers operate in single-user (SU) and in multi-user (MU) mode, and adapt either only modulation and coding scheme, or MIMO scheme in addition. The performance evaluation is done by comparative analysis of saturation throughput achievable by different schedulers, investigating the impact of MU diversity and channel uncertainty.","PeriodicalId":158650,"journal":{"name":"2008 IEEE International Symposium on Wireless Communication Systems","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122018457","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
Multiobjective optimization of service delivery over a heterogeneous wireless access system 异构无线接入系统服务交付的多目标优化
2008 IEEE International Symposium on Wireless Communication Systems Pub Date : 2008-12-30 DOI: 10.1109/ISWCS.2008.4726033
C. Fortuna, M. Mohorčič, Bogdan Filipie
{"title":"Multiobjective optimization of service delivery over a heterogeneous wireless access system","authors":"C. Fortuna, M. Mohorčič, Bogdan Filipie","doi":"10.1109/ISWCS.2008.4726033","DOIUrl":"https://doi.org/10.1109/ISWCS.2008.4726033","url":null,"abstract":"This paper investigates the problem of optimal assignment of wireless interfaces for service delivery in the context of a heterogeneous wireless access system. We formulate service requests initiated by the applications running on the mobile device as a multiobjective optimization (MOO) problem: optimal mapping of application requirements to wireless interface while minimizing the monetary cost and maximizing the satisfaction with respect to QoS metrics. This problem is then solved for three different access scenarios using an exhaustive search algorithm and the NSGA-II MOO algorithm. Our aim is to demonstrate how MOO works in such a context, nevertheless for real life problems where exhaustive search cannot handle the problem, we expect NSGA-II to be a more appropriate tool. The results obtained by these algorithms are then discussed and their quality is compared to a more traditional cost function based on weighted sum.","PeriodicalId":158650,"journal":{"name":"2008 IEEE International Symposium on Wireless Communication Systems","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115047659","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: 9
A power boosting factor determination for the impulse sample in Impulse Postfix OFDM systems 脉冲后置OFDM系统中脉冲采样功率提升因子的确定
2008 IEEE International Symposium on Wireless Communication Systems Pub Date : 2008-12-30 DOI: 10.1109/ISWCS.2008.4726081
Byung Moo Lee, Youngok Kim, Heung-Ryeol You
{"title":"A power boosting factor determination for the impulse sample in Impulse Postfix OFDM systems","authors":"Byung Moo Lee, Youngok Kim, Heung-Ryeol You","doi":"10.1109/ISWCS.2008.4726081","DOIUrl":"https://doi.org/10.1109/ISWCS.2008.4726081","url":null,"abstract":"Recently, a new impulse postfix OFDM (IP-OFDM) system, which performs channel estimation in time-domain by exploiting the impulse postfix instead of pilot tones, was proposed . The proposed IP-OFDM system exploits the impulse postfix, which consists of a high power impulse sample and several zero samples at the end of a OFDM symbol block, to estimate channel impulse response. As shown in , , the IP-OFDM system can achieve the enhanced bit error rate performance compared to that of conventional OFDM systems, but there is an important Peak-to-Average Power Ratio (PAPR) issue for deciding the amount of impulse power in the IP-OFDM system. In , a statistic-based method was proposed to determine the amount of impulse power for avoiding the PAPR increase. However, the proposed method does not give meaningful intuition for us how the designed impulse power would affect to the performance of practical IP-OFDM systems. In real systems, there is a nonlinear High Power Amplifier (HPA) that may cause significant performance degradation of IP-OFDM by distorting the impulse postfix. Therefore, we propose decision criteria of the power boosting factor for impulse sample in practical IP-OFDM systems. With the proposed decision criteria, the impulse power is designed based on the characteristics of the nonlinear HPA. Simulation results demonstrate the effectiveness of the proposed decision criteria for IP-OFDM systems.","PeriodicalId":158650,"journal":{"name":"2008 IEEE International Symposium on Wireless Communication Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128852447","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
Statistical analysis of OFDMA assignments OFDMA分配的统计分析
2008 IEEE International Symposium on Wireless Communication Systems Pub Date : 2008-12-30 DOI: 10.1109/ISWCS.2008.4726009
Maria Vega Martin, J. Gross
{"title":"Statistical analysis of OFDMA assignments","authors":"Maria Vega Martin, J. Gross","doi":"10.1109/ISWCS.2008.4726009","DOIUrl":"https://doi.org/10.1109/ISWCS.2008.4726009","url":null,"abstract":"In this paper we investigate statistical properties of IP optimal subcarrier assignments in the down-link of an OFDMA cell. Essentially, we show that such subcarrier assignments do have ¿hidden¿ statistical properties which can be exploited to design an extremely simple assignment strategy. We investigate such statistical properties and the corresponding performance of the simple assignment rules regarding a specific, well-known, NP-hard assignment problem. Although our approach is ¿light-weight¿ in complexity, the strategy provides a significant performance gain compared to static assignments. Finally, we investigate our approach also for other optimization problems in the context of multi-user OFDMA assignments.","PeriodicalId":158650,"journal":{"name":"2008 IEEE International Symposium on Wireless Communication Systems","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128929666","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
Call Admission Control with QoS guarantees for multiservice Wireless-Broadband over Power Line networks 电力线网络上多业务无线宽带的具有QoS保证的呼叫接纳控制
2008 IEEE International Symposium on Wireless Communication Systems Pub Date : 2008-12-30 DOI: 10.1109/ISWCS.2008.4726040
Georgios I. Tsiropoulos, D. Stratogiannis, P. Cottis
{"title":"Call Admission Control with QoS guarantees for multiservice Wireless-Broadband over Power Line networks","authors":"Georgios I. Tsiropoulos, D. Stratogiannis, P. Cottis","doi":"10.1109/ISWCS.2008.4726040","DOIUrl":"https://doi.org/10.1109/ISWCS.2008.4726040","url":null,"abstract":"The present paper investigates call admission control (CAC) over multiservice wireless - broadband over power line (BPL) networks. The CAC problem is examined not only as a decision process but, also, as a channel reallocation and QoS renegotiation process. A fast and effective CAC algorithm for BPL networks is proposed providing high network utilization, low blocking rate (BR) and fairness between calls of different service classes (SC). Priority levels between calls of different SCs and also between new and handoff calls are assumed. The simulation results demonstrate that the proposed algorithm achieves high utilization and low blocking rate and, at the same time, maintains the priorities imposed on new and handoff calls.","PeriodicalId":158650,"journal":{"name":"2008 IEEE International Symposium on Wireless Communication Systems","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127522192","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
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：481959085
Book学术官方微信