{"title":"Performance testing of a single-phase voltage-source wavelet modulated AC-DC converter","authors":"S. Saleh, M. Rahman","doi":"10.1109/CCECE.2009.5090289","DOIUrl":"https://doi.org/10.1109/CCECE.2009.5090289","url":null,"abstract":"This paper presents the development and performance testing of a new switching strategy for single-phase (1φ) voltage-source (VS) AC-DC converters. The proposed switching strategy is based on employing scale-based linearly-combined wavelet basis functions and their dual synthesis ones for switching 1φ 4-pulse bridge AC-DC converters. The employed wavelet basis functions are meant to sample a DC reference signal in a non-uniform recurrent manner, then reconstruct it using the AC-DC converter's switching actions. The output of such an AC-DC converter is found to contain low harmonic contents along with a unity input power factor.","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":"125154726","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 mobility-based channel model for wireless systems with adaptive modulation","authors":"M. López-Guerrero, Javier Gomez","doi":"10.1109/CCECE.2009.5090229","DOIUrl":"https://doi.org/10.1109/CCECE.2009.5090229","url":null,"abstract":"The purpose of this paper is to introduce a model intended to capture the behavior of the wireless channel at time scales which are related to packet transmission times. In this approach it is assumed that the prime factor affecting data rate selection is the path attenuation. We model the wireless channel using a multistate stochastic process where each state corresponds to the nominal data rate achieved by the station when it uses a particular combination of modulation and coding (i.e., adaptive modulation). Differently from other proposals, in the proposed model state changes are created from mobility assumptions. We illustrate the use of this model with a case study.","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":"123919140","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 quasi-orthogonal space-frequency coded ofdm system with time spreading and constellation rotation","authors":"S. Senthuran, A. Anpalagan, O. Das","doi":"10.1109/CCECE.2009.5090227","DOIUrl":"https://doi.org/10.1109/CCECE.2009.5090227","url":null,"abstract":"A constellation rotated quasi-orthogonal OFDM system could offer full rate and full diversity in a frequency selective fading channel. Time spreading can give additional time diversity gain in a fast fading channel. In this paper, we propose and verify a time-spread quasi-orthogonal space-frequency coded OFDM (TS-QO-SFOFDM) system with constellation rotation. Assuming perfect channel state information at the receiver, we develop a coding scheme for 4×1 MISO transceiver and its BER performance is evaluated for different Doppler frequencies in an OFDM system. Monte-Carlo simulation results show that 2 dB gain can be achieved at BER of 10−3 using the proposed scheme compared to a scheme without time spreading and constellation rotation when 512 subcarriers are used at maximum Doppler frequency of 300 Hz. The proposed scheme also lends itself to easy implementation making it more attractive for adaptive cognitive radio systems.","PeriodicalId":153464,"journal":{"name":"2009 Canadian Conference on Electrical and Computer Engineering","volume":"2 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":"128475595","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":"Signal construction for high-speed access over copper wiring","authors":"A. Enteshari, M. Kavehrad, J. Fadlullah","doi":"10.1109/CCECE.2009.5090089","DOIUrl":"https://doi.org/10.1109/CCECE.2009.5090089","url":null,"abstract":"In this paper, we present signal construction for the future IEEE 40GBASE-T standard. The LDPC assisted coded modulation and demodulation is presented. A code achieving 6dB gain, which is literally high enough to satisfy reliability constraints for data transmission at a rate of 40 Gbps over 50m Cat-7A (class FA) copper cable, is designed and the simulation results are presented. The main objective of the presented work is to extensively reduce the power and implementation complexities of a 40GBASE-T system.","PeriodicalId":153464,"journal":{"name":"2009 Canadian Conference on Electrical and Computer Engineering","volume":"31 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":"128077807","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":"Design and FPGA implementation of iterative decoders for codes on graphs","authors":"Bharathram Sivasubramanian, W. Gross, H. Leib","doi":"10.1109/CCECE.2009.5090295","DOIUrl":"https://doi.org/10.1109/CCECE.2009.5090295","url":null,"abstract":"This work presents a Field Programmable Gate Array (FPGA) implementation of the Min-Sum iterative decoding algorithm for the (8,4) extended Hamming code using a reconfigurable computing system. The Mitrion-C high level language (HLL) is used to program the FPGAs, since it provides flexible tools for FPGA-based prototyping and functional verification for hardware design. A hardware-efficient implementation of the Min-step in the Min-Sum decoder, which eliminates the use of floating point multipliers, is also presented. The parallelism offered by the Min-Sum algorithm is exploited in hardware, resulting in a 15 fold speedup over optimized software implementations. The performance of the hardware implementation is virtually the same as that predicted by computer simulations, validating the hardware design.","PeriodicalId":153464,"journal":{"name":"2009 Canadian Conference on Electrical and Computer Engineering","volume":"34 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":"129857504","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":"On the second-order cyclostationarity for joint signal detection and classification in cognitive radio systems","authors":"Qiyun Zhang, O. Dobre, S. Rajan, R. Inkol","doi":"10.1109/CCECE.2009.5090121","DOIUrl":"https://doi.org/10.1109/CCECE.2009.5090121","url":null,"abstract":"Spectrum awareness is a crucial aspect of a cognitive radio (CR). The CR concept of dynamically sensing and adapting to the radio frequency environment depends on the ability to perform reliable joint signal detection and classification at low signal-to-noise ratios (SNRs) given relaxed a priori information. This paper proposes a joint detection and classification algorithm for single-carrier linearly digitally modulated (SCLD), cyclically prefixed SCLD (CP-SCLD), and orthogonal frequency division multiplexing (OFDM) signals, which does not require estimation of signal and noise powers, symbol timing, and carrier and waveform recovery.","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":"130738770","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}
F. Elsayed, M. Ibrahim, Y. Ghallab, Wael Badawy, B. Maundy
{"title":"A new 90NM CMOS current feedback operational amplifier","authors":"F. Elsayed, M. Ibrahim, Y. Ghallab, Wael Badawy, B. Maundy","doi":"10.1109/CCECE.2009.5090258","DOIUrl":"https://doi.org/10.1109/CCECE.2009.5090258","url":null,"abstract":"A new Current Feedback Amplifier (CFA) suitable for VLSI applications is presented in two different designs to serve both low power (LBW design) and high bandwidth (HBW) applications. The new circuit is employing positive current conveyor followed by amplifier followed by buffer to achieve vey high trans-impedance for this CFA circuit without needing to stack many transistors together and at the same time to use the whole bandwidth range. The proposed circuit is designed and simulated using 90nm technology kit in cadence. The bandwidth of the LBW circuit is approximately constant at 32MHz and for HBW is around 107MHz.","PeriodicalId":153464,"journal":{"name":"2009 Canadian Conference on Electrical and Computer Engineering","volume":"4 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":"129558466","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":"Prohibitive-link Detection and Routing Protocol","authors":"Marwan M. Fayed, Hussein T. Mouftah","doi":"10.1109/CCECE.2009.5090135","DOIUrl":"https://doi.org/10.1109/CCECE.2009.5090135","url":null,"abstract":"In the current body of knowledge, planarity is necessary in order to recover from routing holes using left- or right-hand rule (LHR). This is often referred to as face-routing. In this paper we introduce the Prohibitive-link Detection and Routing Protocol (PDRP). PDRP is a position-based wireless protocol that, when faced with a routing hole, can recover using left-hand rule in a non-planar environment. As the name implies, the protocol detects and circumvents the prohibitive links that hamper LHR. The goal of PDRP is to provide the same levels of service as GPSR-like protocols, while avoiding the prohibitive transmissions of cooperative protocols such as CLDP. Initial results are promising, revealing the same level of service as face-routing protocols despite preserving most intersecting links in the network.","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":"129503532","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":"Efficient partial distortion search algorithm for block based motion estimation","authors":"M. G. Sarwer, Q. M. J. Wu","doi":"10.1109/CCECE.2009.5090256","DOIUrl":"https://doi.org/10.1109/CCECE.2009.5090256","url":null,"abstract":"The block based full search algorithm has been widely used for motion estimation in video coding, but it has the serious problem of significant computation requirements. In order to reduce the computation, this paper proposes a novel partial distortion search algorithm which reduces the computation of each distortion measure by using partial distortion search. In this algorithm, the entire macroblock is divided into different sub-blocks and the calculation order of partial distortion is determined based on the complexity of sub-blocks. A lossy algorithm is also presented by adaptively changing the early termination threshold for the current accumulated partial sum of absolute difference value. Experimental results show that the proposed lossless and lossy algorithm can significantly save about 60% and 70% of the total computational costs, respectively. PSNR degradation of lossy algorithm is very negligible and 0.016 dB on average.","PeriodicalId":153464,"journal":{"name":"2009 Canadian Conference on Electrical and Computer Engineering","volume":"52 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":"129794378","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}
Lei Shi, Jun Pang, Lei Yang, Tiejun Zhang, Donghui Wang
{"title":"Fair-Priority-Expression-Based burst scheduling to enhance performance and fairness of shared dram systems","authors":"Lei Shi, Jun Pang, Lei Yang, Tiejun Zhang, Donghui Wang","doi":"10.1109/CCECE.2009.5090118","DOIUrl":"https://doi.org/10.1109/CCECE.2009.5090118","url":null,"abstract":"Many algorithms ofmemory access scheduling have been studied to attack the well-known memory-wall. However, some of them introduce unfairness problem in Chip-Multi-Processor (CMP) systems. Therefore a new approach called Fair-Priority-Expression-Based (FairPEB) burst scheduling is proposed in this paper to address both performance and unfairness problems. Experiment results show that this method improves data bus utilization of memory system by 15.4% and 31.87% over conventional First-Ready First-Come-First-Service (FR-FCFS) and original burst scheduling. Furthermore it keeps memory accesses of different applications fair.","PeriodicalId":153464,"journal":{"name":"2009 Canadian Conference on Electrical and Computer Engineering","volume":"93 3 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":"127980640","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}