Sina Bakhshandeh Babarsad, S. M. Saberali, A. Forouzan
{"title":"Non-data-aided estimation of signal level in unknown noise using empirical characteristic function","authors":"Sina Bakhshandeh Babarsad, S. M. Saberali, A. Forouzan","doi":"10.1109/IRANIANCEE.2015.7146272","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2015.7146272","url":null,"abstract":"In this paper, we propose a new approach for signal level estimation in binary phase shift keying (BPSK) modulation based on the empirical characteristic function (ECF), when the probability density function (PDF) of the noise is unknown. Then, we compare our proposed method with two other estimators that are suggested for systems with known noises. Numerical results show that, in the presence of Laplace noise, the ECF estimator has a better performance in low signal-to-noise ratios (SNR) in comparison with previously proposed methods. Moreover, the proposed method does not require the knowledge of noise PDF and works without any training sequence.","PeriodicalId":187121,"journal":{"name":"2015 23rd Iranian Conference on Electrical Engineering","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132807810","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}
M. Karami, A. Moosavinia, Mahdi Ehsanian, M. Teshnelab
{"title":"A new evolutionary optimization algorithm inspired by Plant Life Cycle","authors":"M. Karami, A. Moosavinia, Mahdi Ehsanian, M. Teshnelab","doi":"10.1109/IRANIANCEE.2015.7146281","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2015.7146281","url":null,"abstract":"In this paper a new evolutionary optimization algorithm inspired by Plant Life Cycle is proposed. Plants are quite successful in reproduction and searching new habitats despite of their mobility limitations. During millions of years plants continued to innovate new ways of exploiting other animals and peripheral conditions and using them as part of their reproduction cycle. Thanks to these innovations, they not only produce new generations but effectively do local as well as global search in their environment. The proposed algorithm uses general concepts in plant life cycle to form an optimization method. It searches problem space in six steps named: pollination, fertilization, seed production, seed dispersal, local competition and selection to find best possible answer. The proposed algorithm has been implemented on some known test functions and simulation results of proposed algorithm are compared with Genetic algorithm and Cuckoo search algorithm results. Results demonstrate the superiority of new algorithm in most tests over two other algorithms in searching the solution space especially in high dimensions.","PeriodicalId":187121,"journal":{"name":"2015 23rd Iranian Conference on Electrical Engineering","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131153709","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":"Price-based power control in relay networks using Stackelberg game","authors":"A. Rahmati, V. Shah-Mansouri","doi":"10.1109/IRANIANCEE.2015.7146221","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2015.7146221","url":null,"abstract":"In this paper, we study the problem of price-based power control between a source and a relay node under power constraint at relay side. The relay cooperate in transmission of packets from the source to the destination. The source node benefits from the cooperation rate that relay provides and the relay obtains a revenue for forwarding the information of the source to the destination. The source pays the cost of the power that the relay allocates to it for transmitting the information to destination. The relay works under half duplex mode of operation and transmits information using decode and forward (DF) protocol. The problem is to jointly maximize the utility of source and the relay subject to a maximum power constraint at relay side. The interaction between the source and the relay node is investigated using a non-cooperative game model. The strategic game model which is employed is the well-known Stackelberg game. The relay is considered as leader while the source serves as follower. The Stackelberg equilibrium (SE) of the proposed game is obtained using convex optimization and the closed-form solution is obtained for both the leader and the follower subgames. The numerical results evaluate our price-based power control.","PeriodicalId":187121,"journal":{"name":"2015 23rd Iranian Conference on Electrical Engineering","volume":"247 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132845904","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":"Mitigation of range and velocity walk in airborne passive radar with long integration time","authors":"M. J. Ahmadi, R. Amiri, F. Behnia","doi":"10.1109/IRANIANCEE.2015.7146270","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2015.7146270","url":null,"abstract":"One of the most important problems in radar systems is to transmit signal to target and receive echo signal with high SNR. We know from the communication concepts that if we integrate multiple noisy signals, increment in the power of desired signal is more than the increment in noise power. Thus, with a greater number of integrated signals, higher SNR can be obtained. A possible way to increase the number of received signals is extension in integration time. In airborne passive radars with long integration time, moving targets do not have unique range and velocity in range-Doppler surface. Indeed, the bistatic range and velocity of moving target vary during an extended integration time. In this paper we demonstrate that even targets without acceleration have variations in bistatic velocity. Further, we propose an algorithm to mitigate the impact of aforementioned variations.","PeriodicalId":187121,"journal":{"name":"2015 23rd Iranian Conference on Electrical Engineering","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133063014","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":"Optimal dynamic voltage restorer controller for voltage sag compensation","authors":"Faranak Farhadi, Sajjad Solat, S. H. Mahdioun","doi":"10.1109/IRANIANCEE.2015.7146493","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2015.7146493","url":null,"abstract":"This paper proposes an optimal fuzzy logic controller for dynamic voltage restorer (DVR). The DVR is modeled by three phase voltage source inverter (VSI). Simulation is based on zero-order Sugeno fuzzy logic controller and particle swarm optimization (PSO) technique is used to optimally adjust its parameters. The proposed controlling approach is employed to compensate different level of voltage sag. The simulation results show the satisfactory performance of proposed controlling approach.","PeriodicalId":187121,"journal":{"name":"2015 23rd Iranian Conference on Electrical Engineering","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127851507","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":"Laplacian Eigenmaps Latent Variable Model modification for pattern recognition","authors":"S. Keyhanian, B. Nasersharif","doi":"10.1109/IRANIANCEE.2015.7146298","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2015.7146298","url":null,"abstract":"Laplacian Eigenmaps Latent Variable Model (LELVM) is a probabilistic dimensionality reduction model that combines the advantages of latent variable models and observed variables, applied to many practical problems such as pattern recognition. Non-linear dimensionality reduction techniques are affected by two critical aspects: (1) the design of the adjacency graphs, and (2) the embedding of new test data - the out-of-sample problem. For the first aspect, we modify graph construction by changing LE objective function. We add an entropy term to LE objective function. In this way, we obtain a principled edge weight updating formula which naturally corresponds to classical heat kernel weights. For the second aspect, we use the sparse representation approach as a solution to the `out-of-sample' problem. The proposed method is simple, non-parametric and computationally inexpensive. Experimental result on UCI datasets using different classifiers show the feasibility and effectiveness of the proposed method in comparison to conventional LELVM for the classification.","PeriodicalId":187121,"journal":{"name":"2015 23rd Iranian Conference on Electrical Engineering","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123175979","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":"An efficient femtocell-to-femtocell handover decision algorithm in LTE femtocell networks","authors":"Mohsen Rajabizadeh, J. Abouei","doi":"10.1109/IRANIANCEE.2015.7146212","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2015.7146212","url":null,"abstract":"Deployment of femtocells with a small coverage range in wireless networks leads to a frequent handover initiation. The problem is more crucial when femtocells operate in an open access mode. In addition, high speed users initiate unnecessary handovers as they stay in a femtocell for a short time. Taking the above challenges into account, the main goal of this paper is to reduce the number of frequent femtocell-to-femtocell handovers in an open access Long Term Evolution (LTE) network by increasing the time interval between handover triggers. Toward this goal, we propose a new handover decision algorithm which selects the most appropriate target femtocell for handover among many candidates by considering the Received Signal Strength (RSS) and the velocity of the user as decision criteria. Simulation results show about 1.8 times increasing in the time interval between handover triggers and 40% reduction in the amount of handovers in comparison with the traditional handover scheme.","PeriodicalId":187121,"journal":{"name":"2015 23rd Iranian Conference on Electrical Engineering","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125217910","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":"Enhanced multi-route ad hoc on-demand distance vector routing","authors":"Alireza Shamsoshoara, Y. Darmani","doi":"10.1109/IRANIANCEE.2015.7146282","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2015.7146282","url":null,"abstract":"In this work we developed an on-demand, multiroute power aware routing protocol for mobile ad hoc wireless networks named EMR-AODV. This protocol works based on the well-known AODV algorithm. Unlike AODV, each node uses forward and reverse routing table in EMR-AODV. EMR-AODV infers an appropriate lifetime for each path, based on residual energy and distance between nodes. Afterwards and based on these lifetimes, destination and intermediate nodes will choose the best path for the data packets. Unlike AODV, in this algorithm, reverse and forward paths are not coinciding on each other between a pair of nodes. Each node adjusts its transmission power according to its distance to its next hop. Our simulation using ns-2 shows that EMR-AODV extends the lifetime of the nodes up to 73 percent. EMR-AODV also decreases routing overhead about 40 percent by reducing the number of route discovery steps.","PeriodicalId":187121,"journal":{"name":"2015 23rd Iranian Conference on Electrical Engineering","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131993626","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":"Preemption-delay aware self-triggered controller: A scheduler-controller codesign approach","authors":"V. Panahi, M. Mohaqeqi, M. Kargahi","doi":"10.1109/IRANIANCEE.2015.7146306","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2015.7146306","url":null,"abstract":"Digital control systems traditionally are implemented using real-time periodic tasks, which periodically perform the sampling, computation, and actuation steps. Periods are usually chosen pessimistically too short to guarantee the control system stability and/or control performance. However, most of the times, the control system might be stable, accommodating in an appropriate state, and hence, there is no need to execute some control jobs. Self-triggered controllers have been introduced to address this issue through releasing less jobs, depending on the current state of the system. As a result, fewer jobs are executed during the system life time, leading to less energy consumption in the sensor, processing, actuator, and communicating devices. Stability and control performance of self-triggered controllers are sensitive to I/O delays, namely delays happening between samplings and actuations, which are mostly affected by the interferences between different tasks. This paper presents a scheduler-controller co-design approach by first showing how a predictable preemptive scheduling algorithm can provide an upper-bound on the I/O delay, and then presenting an I/O delay-aware self-triggered controller which can tolerate the bounded delays.","PeriodicalId":187121,"journal":{"name":"2015 23rd Iranian Conference on Electrical Engineering","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133885061","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}
M. Shahabi, Roya Jafarnejad, J. Sobhi, Ziaeddin Daei Kouzehkanani
{"title":"A novel low power high CMRR pseudo-differential CMOS OTA with common-mode feedforward technique","authors":"M. Shahabi, Roya Jafarnejad, J. Sobhi, Ziaeddin Daei Kouzehkanani","doi":"10.1109/IRANIANCEE.2015.7146415","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2015.7146415","url":null,"abstract":"This paper presents a novel low-power (LP) pseudo-differential (PD) CMOS operational transconductance amplifier (OTA). The proposed OTA is based on a feedforward cancellation of the input common mode signal at the output nodes in order to enhance the common-mode rejection ratio (CMRR) with the minimum cost of area, the power consumption and the parasitic components. By means of the proposed configuration of the common-mode feedforward (CMFF) technique, the transconductance gain of this OTA is almost two times and four times the transconductance gain of the traditional CMFF OTAs. It also reduces the power needed in comparison with the traditional CMFF OTAs to achieve the same transconductance gain. The post-simulation results shows that the proposed OTA has a 46.4 dB DC gain, a 14.5 MHz gain bandwidth (GBW) and a 85° phase margin for 2 PF capacitive loads. The proposed OTA achieved 110.1 dB CMRR. The OTA consumes only 28.6 μW under a 1.2 V single supply voltage and occupies a very small area of 33 × 10-5 mm2. This OTA is designed and simulated by the TSMC 0.18 μm CMOS process.","PeriodicalId":187121,"journal":{"name":"2015 23rd Iranian Conference on Electrical Engineering","volume":"502 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133268961","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}