8th International Conference on Cognitive Radio Oriented Wireless Networks最新文献_第4页

Dynamic rate adaptation in cognitive radio considering time-dependent channel access models 考虑时变信道接入模型的认知无线电动态速率自适应

8th International Conference on Cognitive Radio Oriented Wireless Networks Pub Date : 2013-07-08 DOI: 10.4108/icst.crowncom.2013.252006

Álvaro Gonzalo-Ayuso, Jesús R. Pêrez

引用次数: 1

A joint approach for PAPR reduction and predistortion by adding signal in cognitive radio 认知无线电中加入信号减少PAPR和预失真的联合方法

8th International Conference on Cognitive Radio Oriented Wireless Networks Pub Date : 2013-07-08 DOI: 10.4108/icst.crowncom.2013.252009

O. A. Gouba, Y. Louët

引用次数: 2

On the delay and data rate performance of throughput-efficient multi-channel access algorithms in cognitive radio networks 认知无线网络中吞吐量高效多通道接入算法的延迟和数据速率性能研究

8th International Conference on Cognitive Radio Oriented Wireless Networks Pub Date : 2013-07-08 DOI: 10.4108/icst.crowncom.2013.252381

Luca Zappaterra, Hyeong-Ah Choi, K. Sayrafian-Pour, J. Iinatti

{"title":"On the delay and data rate performance of throughput-efficient multi-channel access algorithms in cognitive radio networks","authors":"Luca Zappaterra, Hyeong-Ah Choi, K. Sayrafian-Pour, J. Iinatti","doi":"10.4108/icst.crowncom.2013.252381","DOIUrl":"https://doi.org/10.4108/icst.crowncom.2013.252381","url":null,"abstract":"Cognitive Radio Networks (CRNs) are designed to increase spectrum utilization by allowing unlicensed secondary users (SUs) to operate over existing wireless channels where primary users (PUs) have license to transmit. An SU searches for channels not currently occupied by PUs, it estimates their link quality and it aggregates the resources found available for transmission, by means of multi-channel access. Typically, optimal stopping algorithms decide when to interrupt the exploration phase and start exploiting the channels for transmission, with the goal of throughput maximization. In this paper we recognize the importance of evaluating the performance of throughput-efficient multi-channel access algorithms in terms of delay and data rate, which constitute fundamental traffic requirements for mobile applications. Through extensive simulations, we have derived guidelines for supporting SUs with stringent traffic requirements of delay, jitter and guaranteed data rate in the current multi-channel algorithms under multiple CRN scenarios. The encouraging results of the conducted performance evaluation motivate our interest in further researching multi-channel access algorithms for the optimization of application-specific requirements.","PeriodicalId":425536,"journal":{"name":"8th International Conference on Cognitive Radio Oriented Wireless Networks","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132648982","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

Energy-efficient link adaptation for cognitive radios with heterogeneous QoS requirements 具有异构QoS需求的认知无线电的节能链路自适应

8th International Conference on Cognitive Radio Oriented Wireless Networks Pub Date : 2013-07-08 DOI: 10.4108/icst.crowncom.2013.252012

Erqing Zhang, Sixing Yin, Liang Yin, Shufang Li

{"title":"Energy-efficient link adaptation for cognitive radios with heterogeneous QoS requirements","authors":"Erqing Zhang, Sixing Yin, Liang Yin, Shufang Li","doi":"10.4108/icst.crowncom.2013.252012","DOIUrl":"https://doi.org/10.4108/icst.crowncom.2013.252012","url":null,"abstract":"Energy efficiency is crucial in wireless communication systems, especially in cognitive radio (CR) systems in which the exclusive functionality of spectrum sensing inevitably incurs additional energy consumption. In this paper, we study energy-efficient link adaptation for the secondary users (SUs) with heterogeneous quality of service (QoS) requirements in an interference-limited CR system. Two classes of SUs with different QoS are considered: delay-sensitive SUs (DS-SUs) and delay-tolerant SUs (DT-SUs). We focus on energy efficiency (EE) maximization taking into account the SUs' heterogeneous QoS and PU interference constraint. The problem of EE maximization is formulated as a nonlinear fractional programming problem, which is transformed into an equivalent parametric programming problem. Moreover, optimal solution to joint subcarrier assignment and power allocation is derived with the bisection method and dual decomposition method (DDM) in convex optimization theory. Simulation results illustrate the significant performance improvement of our scheme over an existing one which aims at maximizing system throughput rather than EE.","PeriodicalId":425536,"journal":{"name":"8th International Conference on Cognitive Radio Oriented Wireless Networks","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114301234","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

Client-centric heterogeneous access in cognitive WLANs 认知wlan中以客户端为中心的异构访问

8th International Conference on Cognitive Radio Oriented Wireless Networks Pub Date : 2013-07-08 DOI: 10.4108/icst.crowncom.2013.252045

Deming Pang, QUAN LIU, Gang Hu, Yingwen Chen, Ming Xu

引用次数: 0

Transmit beamforming for spectral coexistence of satellite and terrestrial networks 卫星和地面网络频谱共存的发射波束形成

8th International Conference on Cognitive Radio Oriented Wireless Networks Pub Date : 2013-07-08 DOI: 10.4108/icst.crowncom.2013.252017

S. Sharma, S. Chatzinotas, B. Ottersten

{"title":"Transmit beamforming for spectral coexistence of satellite and terrestrial networks","authors":"S. Sharma, S. Chatzinotas, B. Ottersten","doi":"10.4108/icst.crowncom.2013.252017","DOIUrl":"https://doi.org/10.4108/icst.crowncom.2013.252017","url":null,"abstract":"Herein, we study transmit beamforming techniques in an underlay cognitive mode for the coexistence of satellite and terrestrial networks with the satellite forward link as primary and the terrestrial downlink as secondary. Since geostationary satellite terminals have predetermined propagation characteristics so that they always point towards the geostationary satellite, the interference received by the satellite terminals from the terrestrial Base Station (BS) is confined in an angular sector. Based on this a priori knowledge, we propose transmit beamforming techniques at the BS to maximize the Signal to Interference plus Noise Ratio (SINR) towards the desired Secondary User (SU) and to mitigate the interference towards the primary satellite terminals. Different types of Linearly Constrained Minimum Variance (LCMV) techniques have been proposed for our considered scenario where the exact locations and the number of satellite terminals within a specific angular sector are not known while designing the beamformer. Furthermore, an optimization problem is formulated for maximizing the SU rate and it is shown that the worst case SU rate depends on the Primary User (PU) distance, PU interference threshold and the angular separation of the desired SU from the region of interest.","PeriodicalId":425536,"journal":{"name":"8th International Conference on Cognitive Radio Oriented Wireless Networks","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126433749","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: 71

Primary user DoA and RSS estimation in cognitive Radio networks using sectorized antennas 使用扇区天线的认知无线电网络中主用户DoA和RSS估计

8th International Conference on Cognitive Radio Oriented Wireless Networks Pub Date : 2013-07-08 DOI: 10.1109/CROWNCOM.2013.6636792

J. Werner, Jun Wang, Aki Hakkarainen, M. Valkama, D. Cabric

{"title":"Primary user DoA and RSS estimation in cognitive Radio networks using sectorized antennas","authors":"J. Werner, Jun Wang, Aki Hakkarainen, M. Valkama, D. Cabric","doi":"10.1109/CROWNCOM.2013.6636792","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2013.6636792","url":null,"abstract":"Received-signal-strength (RSS) and direction-of arrival (DoA) are the sufficient measurements to solve the primary user localization problem in cognitive radio networks. In this paper we consider using energy measurements from sectorized antenna to estimate RSS and DoA of a primary user. Abstracting from practical antenna types, we define a sectorized antenna as an antenna that can be set to different operating modes, each of which resulting in a selectivity of those signals that arrive from within a certain, continuous range of angles, i.e. a sector. We first characterize the achievable performance of RSS and DoA estimations using energy measurements from sectorized antennas by means of the Cramer-Rao Bound (CRB), which provides a lower bound on the estimation accuracy of any unbiased estimator. We then propose a practical RSS and DoA estimator, namely the simplified least squares (SLS) algorithm. The SLS algorithm minimizes a cost function obtained from two largest energy measurements among all sectors, and its accuracy closely approaches the CRB. Simulation results studying the impact of important system parameters, such as SNR, number of sectors and number of samples, on the achievable accuracy specified by the CRB and the SLS algorithm are presented.","PeriodicalId":425536,"journal":{"name":"8th International Conference on Cognitive Radio Oriented Wireless Networks","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134390995","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: 8

Enhanced energy detection for multi-band spectrum sensing under RF imperfections 射频缺陷下多波段频谱传感的增强能量检测

8th International Conference on Cognitive Radio Oriented Wireless Networks Pub Date : 2013-07-08 DOI: 10.4108/icst.crowncom.2013.252015

A. Gokceoglu, S. Dikmese, M. Valkama, M. Renfors

{"title":"Enhanced energy detection for multi-band spectrum sensing under RF imperfections","authors":"A. Gokceoglu, S. Dikmese, M. Valkama, M. Renfors","doi":"10.4108/icst.crowncom.2013.252015","DOIUrl":"https://doi.org/10.4108/icst.crowncom.2013.252015","url":null,"abstract":"In this paper, we study simultaneous multi-channel spectrum sensing in cognitive radio context. The sensing receiver RF front-end is assumed to deploy wideband multi-channel IQ down-conversion which is well-suited for highly-integrated circuit implementations. Such RF front-end is, however, also prone to several RF impairments, such as IQ imbalance, which leads to mirror-frequency cross-talk and can thus considerably degrade the sensing performance. Assuming that the individual channel sensing is building on energy detection, we first analyze the spectrum sensing performance of the multichannel sensing receiver in terms of false alarm and detection probabilities. The analysis shows that IQ imbalance is especially harmful in terms of false alarms stemming from the mirror-channel crosstalk, and is greatly emphasized when the overall down-converted signal has high dynamic range. Motivated by this, we present an efficient digital compensation scheme, called energy correction method, where the sensing statistics of any particular channel are properly adjusted based on the corresponding mirror-channel statistics such that the effect of the crosstalk is minimized. Optimum minimum mean-squared error (MMSE) solution for the energy correction processing is first derived, complemented then with a practical low-complexity sample estimator. Extensive computer simulations demonstrate that under various parameter settings for IQ imbalance and receiver dynamic range, the proposed scheme yields sensing performance practically identical to the IQ imbalance free reference performance. Thus the proposed method offers feasible RF impairment-aware energy detection solution for practical multichannel sensing receivers.","PeriodicalId":425536,"journal":{"name":"8th International Conference on Cognitive Radio Oriented Wireless Networks","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128300967","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

Enforcement and spectrum sharing: A case study of the 1695–1710 MHz band 执法和频谱共享:1695-1710 MHz频段的案例研究

8th International Conference on Cognitive Radio Oriented Wireless Networks Pub Date : 2013-07-08 DOI: 10.4108/icst.crowncom.2013.252040

M. Weiss, MohammedBinSaadSaleh Altamimi., M. McHenry

引用次数: 22

A split architecture for random access MAC for SDR platforms 一种针对SDR平台随机存取MAC的拆分架构

8th International Conference on Cognitive Radio Oriented Wireless Networks Pub Date : 2013-07-08 DOI: 10.4108/icst.crowncom.2013.252050

Paolo Di Francesco, Séamas McGettrick, Uchenna K. Anyanwu, J. C. O'Sullivan, A. B. Mackenzie, L. Dasilva

{"title":"A split architecture for random access MAC for SDR platforms","authors":"Paolo Di Francesco, Séamas McGettrick, Uchenna K. Anyanwu, J. C. O'Sullivan, A. B. Mackenzie, L. Dasilva","doi":"10.4108/icst.crowncom.2013.252050","DOIUrl":"https://doi.org/10.4108/icst.crowncom.2013.252050","url":null,"abstract":"Implementation of carrier-sensing-based medium access control (MAC) protocols on inexpensive reconfigurable radio platforms has proven challenging due to long and unpredictable delays associated with both signal processing on a general purpose processor (GPP) and the interface between the RF front-end and the GPP. This paper describes the development and implementation of a split-functionality architecture for a contention-based carrier-sensing MAC, in which some of the functions reside on an FPGA (field programmable gate array) and others reside in the GPP. We provide an FPGA-based implementation of a carrier sensing block and develop two versions of a CSMA MAC protocol based upon this block. We experimentally test the performance of the resulting protocols in a multihop environment in terms of end-to-end throughput and required frame retransmissions. We cross-validate these results with a network simulator with modules modified to reflect the mean and variance of delays measured in components of the real software-defined radio system.","PeriodicalId":425536,"journal":{"name":"8th International Conference on Cognitive Radio Oriented Wireless Networks","volume":"279 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132728342","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