{"title":"On the effects of random timing jitter on spectrum sensing algorithms based on cyclostationarity","authors":"M. Oner","doi":"10.1109/CCECE.2009.5090123","DOIUrl":"https://doi.org/10.1109/CCECE.2009.5090123","url":null,"abstract":"Cognitive radio is an enabling technology, which is expected to lead to a more efficient utilization of the available spectral resources due to its flexibility and its ability to sense its spectral environment. Recently, spectrum sensing methods based on exploiting the cyclostationary characteristics of communication signals have been drawing interest. In practice, imperfections in the signal generation or reception may affect the cyclic statistics of a signal of interest, leading to a degradation in the performance of cyclostationarity-exploiting spectrum sensing schemes based on an ideal signal model. A typical source of imperfection is random timing jitter, which can occur at the transmitter side, most notably in the form of pulse timing jitter for digitally modulated signals, or at the receiver side in the form of sampling jitter. In this work, we explore the effect of randomtiming jitter on the second order cyclostationary statistics of wide sense cyclostationary signals. General analytical expressions are derived for the cyclic statistics of signals in the presence of sampling and pulse timing jitter and specific results are provided for cases of practical interest. Subsequently, the effect of the both jitter types on a cyclostationary-based spectrum sensing algorithm is investigated via simulations.","PeriodicalId":153464,"journal":{"name":"2009 Canadian Conference on Electrical and Computer Engineering","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126383034","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}
{"title":"A hybrid control strategy for multiple mobile robots with nonholonomic constraints","authors":"G. Gamage, G. Mann, R. Gosine","doi":"10.1109/CCECE.2009.5090211","DOIUrl":"https://doi.org/10.1109/CCECE.2009.5090211","url":null,"abstract":"This paper explains a hybrid control strategy developed to coordinate multiple autonomous mobile robots with nonholonomic constraints. The robots are required to navigate in an obstacles populated environment with a predetermined geometric formation. The nonlinear robot dynamics are fully state feedback linearized in order to yield linear controllable systems while the dynamics of the environment are handled by an event based hybrid automata. The chattering effect of the switched system is tackled by incorporating sliding dynamics in the automata. The proposed system is implemented through simulation and the results are shown to verify its operation.","PeriodicalId":153464,"journal":{"name":"2009 Canadian Conference on Electrical and Computer Engineering","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126995979","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}
{"title":"A distributed and cooperative supervisory estimation of multi-agent systems - Part I: Framework","authors":"S. Azizi, M. M. Tousi, K. Khorasani","doi":"10.1109/CCECE.2009.5090286","DOIUrl":"https://doi.org/10.1109/CCECE.2009.5090286","url":null,"abstract":"In this work, we propose a framework for supervisory cooperative estimation of multi-agent linear time-invariant (LTI) systems. We introduce a group of sub-observers, each estimating certain states that are conditioned on given input, output, and state information. The cooperation among the sub-observers is supervised by a discrete-event system (DES) supervisor. The supervisor makes decisions on selecting and configuring a set of sub-observers to successfully estimate all states of the system. Moreover, when certain anomalies are present, the supervisor reconfigures the set of selected sub-observers so that the impact of anomalies on the estimation performance is minimized. This framework is applicable to any multi-agent system including large-scale industrial processes. In this paper (Part I), our proposed framework for supervisory estimation is developed based on the notion of sub-observers and DES supervisory control. In the companion paper (Part II), a DES-based combinatorial optimization method for selection of an optimal set of sub-observers is presented, the feasibility of the overall integrated sub-observers is validated, and the application of our proposed method in a practical industrial process is demonstrated through numerical simulations.","PeriodicalId":153464,"journal":{"name":"2009 Canadian Conference on Electrical and Computer Engineering","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126279586","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}
{"title":"Narrowband interference suppression method in Cognitive Ultra-wide Band Radio","authors":"X. Ning, X. Sha, Lin Mei","doi":"10.1109/CCECE.2009.5090175","DOIUrl":"https://doi.org/10.1109/CCECE.2009.5090175","url":null,"abstract":"This paper investigates a novel narrowband interference (NBI) suppression method in Cognitive Ultra-wide Band (CUWB) Radio system. UWB signals and NBI are separated by Fractional Fourier Transform (FRFT) domain filters, and therefore an estimation of NBI can be obtained by utilizing inverse FRFT. The simulation results show that the UWB pulse waveform designed by Semi-definite Programming (SDP), which is a weighted sum of chirp functions, meets the emission mask established by the Federal Communications Commission (FCC), and the use of chirp function ensures that the FRFT domain duration of UWB pulse waveform is very short. Therefore the NBI parameters (e.g. center frequency, bandwidth, energy) are more convenient to be obtained by the estimated NBI. The UWB signal will not have a detrimental effect on the performance of the narrowband system by suppressing the UWB signal in the NBI band.","PeriodicalId":153464,"journal":{"name":"2009 Canadian Conference on Electrical and Computer Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129281142","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}
{"title":"High performance synchronized dual elliptic curve crypto-processor","authors":"A. A. Zadeh","doi":"10.1109/CCECE.2009.5090271","DOIUrl":"https://doi.org/10.1109/CCECE.2009.5090271","url":null,"abstract":"In this paper a dual crypto-processor for elliptic curve cryptography has been proposed. The proposed architecture can perform two independent scalar multiplications in parallel over GF(2m). Although in this crypto-processor two independent scalar multiplications are performed in parallel, no extra arithmetic unit is employed in this crypto-processor (except an addition unit). Thus the architecture includes a field multiplier, a field divider, a field squarer and two field adders over the extension field with the degree of 163, which could perform complete arithmetic operations for elliptic curve cryptography. In this crypto-processor two scalar multipliers are synchronized and no conflicts occur in using the arithmetic units (during the execution of scalar multiplication). The implemented results of the Synchronized Dual Elliptic Curve Crypto-processor show that two scalar multiplications could be performed in1.95 msec, (in XC3S1500 platform) while one scalar multiplication takes approximately the same time for this crypto-processor.","PeriodicalId":153464,"journal":{"name":"2009 Canadian Conference on Electrical and Computer Engineering","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127673242","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}
Sang-Soo Park, Amit K. Jinda, A. Gole, Minwon Park, I. Yu
{"title":"An optimized sensorless MPPT method for PV generation system","authors":"Sang-Soo Park, Amit K. Jinda, A. Gole, Minwon Park, I. Yu","doi":"10.1109/CCECE.2009.5090224","DOIUrl":"https://doi.org/10.1109/CCECE.2009.5090224","url":null,"abstract":"This paper describes a sensorless MPPT technique for PV generation system. A DC-DC converter has been used to step-up or step-down the PV voltage. Optimization technique has been implemented to optimize the current and voltage controller gain parameters. PSCAD/EMTDC simulation results revealed that the proposed control has better response.","PeriodicalId":153464,"journal":{"name":"2009 Canadian Conference on Electrical and Computer Engineering","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132976117","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}
{"title":"Toward a general control design paradigm for hybrid systems: Ideas, concepts, and formulations","authors":"Mehdi Fatemi, J. Millan, Tina Yu, S. O'Young","doi":"10.1109/CCECE.2009.5090307","DOIUrl":"https://doi.org/10.1109/CCECE.2009.5090307","url":null,"abstract":"This paper sheds light on the concepts of decision making and optimal control in the supervisory control of hybrid systems. Here, “decision-making” is defined as “priority-setting,” meaning that we construct a priority mapping that is allowed to be defined from both policies and the system's physical limitations. At the run time, the supervisory control of any hybrid system results in a set of possible transitions for the current state from which one should be picked. However, the set may consist of more than one transition at the highest priority. In such a case, hybrid optimal control is defined to be applied. Therefore, the purpose of this paper is to highlight these stages of specification to be implemented through a novel multi-layer framework for the execution and control of hybrid systems.","PeriodicalId":153464,"journal":{"name":"2009 Canadian Conference on Electrical and Computer Engineering","volume":"225 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116316091","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}
{"title":"Partner selection strategy for users with high speed in cooperative diversity systems","authors":"Jing-ning Wang, X. Sha, Wei-dang Lu, Zhongzhao Zhang","doi":"10.1109/CCECE.2009.5090249","DOIUrl":"https://doi.org/10.1109/CCECE.2009.5090249","url":null,"abstract":"Cooperative diversity has been adopted to form virtual antenna arrays in order to obtain spatial diversity gains. Various partner selection methods in cooperative diversity systems were proposed and analyzed. However, these methods are not effective for users with high speed, such as users in cars on high way. A novel partner selection strategy is presented in this paper by dividing users into three groups according to their moving speeds and directions if there are any high speed users in a certain cell. The partners for cooperation are selected from the same group with the source user. Simulation results show that the selection strategy can increase duration of cooperation, as well as decrease the partner handoff times and probability of unsuccessful partner selection.","PeriodicalId":153464,"journal":{"name":"2009 Canadian Conference on Electrical and Computer Engineering","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116921690","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}
{"title":"Orthogonal hermite functions based orthogonal pulse shaping method","authors":"Xuanli Wu, Xin Qiu, Xiaoyan Ning, Di Lin","doi":"10.1109/CCECE.2009.5090184","DOIUrl":"https://doi.org/10.1109/CCECE.2009.5090184","url":null,"abstract":"Ultra-Wideband (UWB) communication has attracted more attentions due to its advantages in short range applications. As one of the key techniques in UWB systems, many pulse shaping methods have been proposed. The semi-definite programming (SDP) based pulse shaping method can obtain the pulse with highest power efficiency by far. However, an accurate timing of 40ps is required, and such requirement cannot be implemented precisely using modern hardware. Furthermore, the power efficiency of the second orthogonal pulse will be lower than the first pulse. To solve such problems, the linear combination of orthogonal Hermite functions is used in the SDP method and a modification method is then proposed to eliminate the direct current (DC) component. Simulation results show that orthogonal pulses without DC component can be obtained and the power efficiency of the obtained pulses are more than 80%. Moreover, the obtained orthogonal pulses will have shorter pulse duration due to the energy concentration property of orthogonal spaces.","PeriodicalId":153464,"journal":{"name":"2009 Canadian Conference on Electrical and Computer Engineering","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116657582","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}
{"title":"Dynamic leakage aware power management with procrastination method","authors":"Yongwen Pan, Man Lin","doi":"10.1109/CCECE.2009.5090130","DOIUrl":"https://doi.org/10.1109/CCECE.2009.5090130","url":null,"abstract":"Power management is an important factor during the design of real-time systems. Dynamic voltage scaling is an effective technique to reduce dynamic power consumption. With the higher density of processors, the leakage power consumption can not be ignored, which makes power management more complicated. Power shutdown and procrastination method can be used to reduce static power consumption due to leakage current efficiently. A dynamic leakage aware power management algorithm with procrastination for job-level periodic task set using EDF policy is developed. Experimental results show that it derives a good energy performance.","PeriodicalId":153464,"journal":{"name":"2009 Canadian Conference on Electrical and Computer Engineering","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116761028","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}