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2007 4th International Symposium on Wireless Communication Systems最新文献

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An Optimal Strategy for Power Sensitive Localization in Ad Hoc Networks Ad Hoc网络中功率敏感定位的最优策略
2007 4th International Symposium on Wireless Communication Systems Pub Date : 2007-12-04 DOI: 10.1109/ISWCS.2007.4392318
P. Tarrío, A. Bernardos, J. Casar
{"title":"An Optimal Strategy for Power Sensitive Localization in Ad Hoc Networks","authors":"P. Tarrío, A. Bernardos, J. Casar","doi":"10.1109/ISWCS.2007.4392318","DOIUrl":"https://doi.org/10.1109/ISWCS.2007.4392318","url":null,"abstract":"This paper considers an ad hoc network in which it is assumed that each node estimates its position by measuring the distances to its neighbor nodes. We evaluate the energy consumption in the network during the measurement process and find a transmission strategy, in terms of the transmission power and the packet transmission rate, which minimizes the total energy consumption of the network while achieving certain accuracy in the distance estimations between pairs of nodes. An evaluation of the sensitivity of this strategy with respect to errors in the distance estimations is also performed.","PeriodicalId":261480,"journal":{"name":"2007 4th International Symposium on Wireless Communication Systems","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130980241","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
Enhanced Energy Detector for IEEE 802.22 WRAN Systems Using Maximal-to-Mean Power Ratio 基于最大平均功率比的IEEE 802.22 WRAN系统增强能量检测器
2007 4th International Symposium on Wireless Communication Systems Pub Date : 2007-12-04 DOI: 10.1109/ISWCS.2007.4392364
Guanbo Zheng, Ning Han, Xiaoge Huang, Sunghwan Sohn, J. Kim
{"title":"Enhanced Energy Detector for IEEE 802.22 WRAN Systems Using Maximal-to-Mean Power Ratio","authors":"Guanbo Zheng, Ning Han, Xiaoge Huang, Sunghwan Sohn, J. Kim","doi":"10.1109/ISWCS.2007.4392364","DOIUrl":"https://doi.org/10.1109/ISWCS.2007.4392364","url":null,"abstract":"Spectrum sensing is the key function in implementing cognitive radio, which enables secondary users to identify and utilize vacant spectrum resource allocated to primary users. Recent studies have proposed three major sensing methods for WRAN systems, including matched filter, energy and feature detector. However, there are some drawbacks along with them. In this paper, we propose an enhanced energy detector that extends the ability of conventional one to differentiate the primary user from the other as well as the noise with maximum- to-mean power ratio. A novel structure of cognitive radio detector employing the proposed algorithm is also presented to implement spectrum sensing. The simulation result shows that our proposed scheme performs well in the individual sensing environment and can satisfy the requirement with high detection probability.","PeriodicalId":261480,"journal":{"name":"2007 4th International Symposium on Wireless Communication Systems","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129264324","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: 14
A Predictive Scheduler for FDD Systems Based on the Windowed Empirical CDF 基于窗口经验CDF的FDD系统预测调度
2007 4th International Symposium on Wireless Communication Systems Pub Date : 2007-12-04 DOI: 10.1109/ISWCS.2007.4392455
S. Sorrentino, U. Spagnolini
{"title":"A Predictive Scheduler for FDD Systems Based on the Windowed Empirical CDF","authors":"S. Sorrentino, U. Spagnolini","doi":"10.1109/ISWCS.2007.4392455","DOIUrl":"https://doi.org/10.1109/ISWCS.2007.4392455","url":null,"abstract":"Channel aware schedulers represent a convenient solution for the resource allocation problem in wireless systems by leveraging on fast channel fluctuations to achieve a convenient trade-off between sum-rate and fairness. Even though the current decision is conventionally performed with respect to the past assignments and measurements, interest has recently been focused on predictive schedulers to account on the future (i.e., predicted) channel values for the optimization of the current decisions. This paper provides the implementation for a class of predictive schedulers called P-CBS (predictive CDF based scheduler) as they are based on the empirical cumulative density function of the channel quality. Differently from related works on this topic, here it is assumed that the knowledge about the channel quality is achieved through feedback channels from the users as currently envisaged for Beyond 3G standards. The proposed optimal scheduling approach takes advantage of the estimated CDF from available past values in a predictive way. A sub- optimal (and somewhat intuitive) approach for P-CBS that neglects the optimization with respect to prediction uncertainty is also discussed in this work. The P-CBS scheduler proposed in this paper is basically optimized for LoS fading and it achieves a better trade-off between sum-rate and fairness even in No-LoS when compared to non-predictive schedulers.","PeriodicalId":261480,"journal":{"name":"2007 4th International Symposium on Wireless Communication Systems","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128817981","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 Optimal Slot Allocation for Reservation TDMA MAC Protocol in Shadow Fading Environment 阴影衰落环境下保留TDMA MAC协议的最优时隙分配
2007 4th International Symposium on Wireless Communication Systems Pub Date : 2007-12-04 DOI: 10.1109/ISWCS.2007.4392453
J. Gadze, N. Pissinou, K. Makki, G. Crosby
{"title":"On Optimal Slot Allocation for Reservation TDMA MAC Protocol in Shadow Fading Environment","authors":"J. Gadze, N. Pissinou, K. Makki, G. Crosby","doi":"10.1109/ISWCS.2007.4392453","DOIUrl":"https://doi.org/10.1109/ISWCS.2007.4392453","url":null,"abstract":"This paper investigates the problem of providing delay guarantees to time-sensitive users sharing an uplink channel. The channel is a time slotted joint AWGN and impulsive noise channel in a shadow fading environment. Guaranteeing delay in shadow fading and noisy environment requires the MAC layer to be aware of the application delay requirements and the physical layer characteristics of the wireless channel. One of the important components of the base station MAC is the slot allocation module that allocates time slots to users. Existing slot allocation schemes use linear proportional schemes based on the queue state and priority factor. We develop an optimal slot allocation scheme that bases its allocation decision on the buffer content, the traffic class factor and the wireless channel quality. We specify the wireless channel quality in terms of the probability of connectivity between users and the base station and develop a method of estimating this quantity. Instead of absolute no transmission during bad wireless link states our optimal slot allocation module allots fewer slots in bad link states. The slot allocation module is used in a reservation TDMA base station (BS) MAC to control queuing delay and improve throughput. The performance of the slot allocation scheme is evaluated using OPNET simulation.","PeriodicalId":261480,"journal":{"name":"2007 4th International Symposium on Wireless Communication Systems","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125399954","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
Topology Generation and Power Assignment in IR-UWB Networks IR-UWB网络拓扑生成与功率分配
2007 4th International Symposium on Wireless Communication Systems Pub Date : 2007-12-04 DOI: 10.1109/ISWCS.2007.4392345
D. Bielefeld, R. Mathar
{"title":"Topology Generation and Power Assignment in IR-UWB Networks","authors":"D. Bielefeld, R. Mathar","doi":"10.1109/ISWCS.2007.4392345","DOIUrl":"https://doi.org/10.1109/ISWCS.2007.4392345","url":null,"abstract":"In this paper, two different power assignment strategies for an ultra-wideband impulse radio (IR-UWB) multi-user system are presented and compared in terms of computational complexity. The algorithms aim at finding the lowest possible transmission power for each node in the network under the constraint that individual QoS demands of all nodes are met. The first direct approach results in a high computational complexity contradicting the intention of building low complexity IR-UWB transceivers. We show how the complexity of the power assignment problem can be substantially lowered by analytical means if the network topology is taken into consideration. Additionally, an algorithm creating the necessary network topology is discussed.","PeriodicalId":261480,"journal":{"name":"2007 4th International Symposium on Wireless Communication Systems","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126559200","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
HSDPA Link Adaptation Improvement Based on Node-B CQI Processing 基于b节点CQI处理的HSDPA链路自适应改进
2007 4th International Symposium on Wireless Communication Systems Pub Date : 2007-12-04 DOI: 10.1109/ISWCS.2007.4392410
David Martín-Sacristán, J. Monserrat, Daniel Calabuig, N. Cardona
{"title":"HSDPA Link Adaptation Improvement Based on Node-B CQI Processing","authors":"David Martín-Sacristán, J. Monserrat, Daniel Calabuig, N. Cardona","doi":"10.1109/ISWCS.2007.4392410","DOIUrl":"https://doi.org/10.1109/ISWCS.2007.4392410","url":null,"abstract":"In this paper HSDPA link adaptation (LA) based on Channel Quality Indicator (CQI) reports is optimised. A pre-processing of the last received CQI reports is done before the execution of the LA algorithm in the Node-B in order to obtain more profitable channel quality estimations and hence improve the LA performance. Different types of processing techniques are presented and assessed, considering from the simplest sample averaging to some more elaborated predictive algorithms. Results demonstrate that a non negligible enhancement in the LA performance can be obtained if medium and high speed users are considered.","PeriodicalId":261480,"journal":{"name":"2007 4th International Symposium on Wireless Communication Systems","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125921541","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: 14
Optimization of the pulse shape of OFDM systems Using the Arrow-Hurwicz Algorithm 用Arrow-Hurwicz算法优化OFDM系统的脉冲形状
2007 4th International Symposium on Wireless Communication Systems Pub Date : 2007-12-04 DOI: 10.1109/ISWCS.2007.4392308
Raouia Ayadi, I. Kammoun, M. Siala
{"title":"Optimization of the pulse shape of OFDM systems Using the Arrow-Hurwicz Algorithm","authors":"Raouia Ayadi, I. Kammoun, M. Siala","doi":"10.1109/ISWCS.2007.4392308","DOIUrl":"https://doi.org/10.1109/ISWCS.2007.4392308","url":null,"abstract":"Orthogonal frequency division multiplexing (OFDM) has been used in various wireless communication systems. For these OFDM systems, the elementary pulse has to guarantee orthogonality with its time-frequency shifted versions. However, the time and frequency dispersion of the wireless channel leads to the loss of this orthogonality, producing inter-symbol and inter-channel interference. In order to reduce these interferences, a good localization of the pulse shape is required. In this paper, we investigate the optimization of the OFDM pulse shape for time and frequency dispersive channels. We consider the same envelope functions in transmission and reception. The proposed pulse shape is expressed as a linear combination of the most localized Hermite functions. The optimization, with respect to the signal-to-interference ratio (SIR), is carried out using the Arrow-Hurwicz algorithm. Simulations show that OFDM optimized systems can be outperform conventional OFDM systems.","PeriodicalId":261480,"journal":{"name":"2007 4th International Symposium on Wireless Communication Systems","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124931103","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
Blind carrier frequency offset estimation for cross QAM constellations 交叉QAM星座载波频偏盲估计
2007 4th International Symposium on Wireless Communication Systems Pub Date : 2007-12-04 DOI: 10.1109/ISWCS.2007.4392338
S. Colonnese, G. Panci, S. Rinauro, G. Scarano
{"title":"Blind carrier frequency offset estimation for cross QAM constellations","authors":"S. Colonnese, G. Panci, S. Rinauro, G. Scarano","doi":"10.1109/ISWCS.2007.4392338","DOIUrl":"https://doi.org/10.1109/ISWCS.2007.4392338","url":null,"abstract":"This paper introduces a novel blind frequency offset estimator for signaling using cross Quadrature Amplitude Modulated constellations. The estimator is based on the tentative frequency offset compensation of nonlinearly transformed received signal samples and on their accumulation in different angular windows. When the compensation perfectly removes the frequency offset, the measurements are suitably clustered and their accumulation, that we call the \"Constellation Phase Signature\" (CPS), is a peaked function of the window orientation. Hence, the frequency offset estimator is obtained by adjusting the compensation so that the peakness of the sample CPS is maximized. The performance of the estimator has been evaluated by numerical simulations. Comparison of the CPS based estimator with a selected existing estimator shows that it performs well for medium to high values of SNR.","PeriodicalId":261480,"journal":{"name":"2007 4th International Symposium on Wireless Communication Systems","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121590450","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
Space-Time Adaptive MMSE Multiuser Decision Feedback Detectors with Multiple Feedback Interference Cancellation for CDMA Systems CDMA系统多反馈干扰抵消的空时自适应MMSE多用户决策反馈检测器
2007 4th International Symposium on Wireless Communication Systems Pub Date : 2007-12-04 DOI: 10.1109/ISWCS.2007.4392420
Yunlong Cai, R. D. Lamare
{"title":"Space-Time Adaptive MMSE Multiuser Decision Feedback Detectors with Multiple Feedback Interference Cancellation for CDMA Systems","authors":"Yunlong Cai, R. D. Lamare","doi":"10.1109/ISWCS.2007.4392420","DOIUrl":"https://doi.org/10.1109/ISWCS.2007.4392420","url":null,"abstract":"In this work, we propose a novel adaptive space- time MMSE decision feedback detection scheme, which employs a structure with multiple-parallel feedback branches (MPF) for interference cancellation and combines this novel structure with antenna arrays using both diversity and beamforming configurations. Our proposed adaptive DF algorithm can be used in several scenarios, including MIMO and MC-CDMA systems. In this paper, we focus on the application to DS-CDMA systems and the use of adaptive algorithms for parameter estimation. Simulation results for an uplink scenario with uncoded systems assess the proposed MPF-DF detector against the best known schemes and show that it achieves a substantial capacity increase over existing schemes.","PeriodicalId":261480,"journal":{"name":"2007 4th International Symposium on Wireless Communication Systems","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114258074","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
Diversity Gain Analysis of a Novel Dual-Frequency Multiple Access Relay Transmission Scheme 一种新型双频多址中继传输方案的分集增益分析
2007 4th International Symposium on Wireless Communication Systems Pub Date : 2007-12-04 DOI: 10.1109/ISWCS.2007.4392382
B. Khalaj, J. Ser, P. Crespo, Jesús Gutiérrez-Gutiérrez
{"title":"Diversity Gain Analysis of a Novel Dual-Frequency Multiple Access Relay Transmission Scheme","authors":"B. Khalaj, J. Ser, P. Crespo, Jesús Gutiérrez-Gutiérrez","doi":"10.1109/ISWCS.2007.4392382","DOIUrl":"https://doi.org/10.1109/ISWCS.2007.4392382","url":null,"abstract":"In this paper, we will present diversity gain analysis of a novel channel assignment scheme at the relay for the case in which two non-cooperative independent users communicate with their destination through a single relay and by using only two frequency channels. The analysis of two main relay techniques, namely the amplify-and-forward (AF) and decode-and-forward (DF) will be provided. As the results show, the DF approach provide a higher diversity gain especially in scenarios in which the relay is closer to the receiver.","PeriodicalId":261480,"journal":{"name":"2007 4th International Symposium on Wireless Communication Systems","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122828852","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
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