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New hybrid of PTS-CAPPR methods using GA for PAPR reduction in OFDM systems

New hybrid of PTS-CAPPR methods using GA for PAPR reduction ...

引用

International Symposium on Communications and Information Technologies (ISCIT)

作者： Chusit Pradabpet Shingo Yoshizawa Yoshikazu Miyanaga Kobchai Dejhan Faculty of Science and Technology Phranakhon Si Ayutthaya Rajabhat University Phranakhon Si Ayutthaya Thailand Division of Media & Network Technologies Graduate School of Information Science and Technology Hokkaido University Sapporo Japan Department of Telecommunication Engineering Faculty of Engineering King Mongkut''s Institute of Technology Ladkrabang Bangkok Thailand

In this paper, we propose a new PAPR reduction by using the hybrid of partial transmit sequences (PTS) and cascade adaptive peak power reduction (CAPPR) methods with coded side information (SI) technique design by genetic algorithm (GA). These methods are used in an orthogonal frequency division multiplexing (OFDM) system. The OFDM employs orthogonal sub-carriers for data modulation. These sub-carriers unexpectedly present a large peak to average power ratio (PAPR) in some cases. A proposed reduction method consists of these two methods and realizes both advantages at the same time. In order to obtain the optimum condition on PTS for PAPR reduction, a quite large calculation cost must be demanded and thus it is impossible to obtain the optimum PTS. In the proposed method, by using the pseudo-optimum condition with a coded SI technique designed by GA, the total calculation cost becomes drastically reduced. In simulation results, the proposed method shows the improvement on PAPR and also reveals the high performance on bit error rate (BER) of an OFDM system.

关键词： Peak to average power ratio OFDM Partial transmit sequences Bit error rate Genetic engineering Design engineering Power engineering and energy Interference Digital audio broadcasting Multimedia communication

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OTA-based high frequency CMOS multiplier and squaring circuit

OTA-based high frequency CMOS multiplier and squaring circui...

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IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)

作者： Risanuri Hidayat Kobchai Dejhan Phichet Moungnoul Yoshikazu Miyanaga Faculty of Engineering and Research Center of Communication and Information Technology King Mongkut''s Institute of Technology Ladkrabang Bangkok Thailand Division of Media and Network technologies Graduate School of Information Science and Technology Hokkaido University Sapporo Japan

A gigahertz analog multiplier based on OTA and squaring is proposed. The multiplier has gigahertz frequency response is suitable to use in communication system. The circuit is based on 0.18 mum CMOS technology simulated using PSPICE level 7. This technique provides; wide dynamic range, GHz-bandwidth response and low power consumption. The proposed circuit has been simulated with PSPICE and achieved -3 dB bandwidth of 3.96 GHz. The total power dissipation is 0.588 mW with plusmn1 V power supply voltages..

关键词： CMOS technology Circuit simulation SPICE Frequency response Dynamic range Energy consumption Bandwidth Power dissipation Power supplies Voltage

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Designing a groupware with handheld devices for learning mathematics

Designing a groupware with handheld devices for learning mat...

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5th IEEE International Workshop on Wireless, Mobile and Ubiquitous Technologies in Education

作者： Tao, Shu-Yuan Ho, Kuang-Wen Chung, Chen-Wei Liu, Baw-Jhiune Liu, Chen-Chung Department of Computer Science and Engineering Yuan Ze University Taiwan Department of Information Management Chungyu Institute of Technology Taiwan Department of Computer Science and Information Engineering Central University Taiwan Graduate Institute of Network Learning Technology Central University Taiwan

ISBN: (纸本)9780769531083

This study proposed a groupware and a flow of learning activity to guide students in learning arithmetic word problem with handheld devices. Appropriating the concept of semi-situated learning which was aided by the 4-frame comic embedded into the PDA, this study expected the comic to play as a catalyst to trigger students in articulating some theme associated with the content of the 4-frame comic. The scenario and features of this groupware are presented in the paper and a preliminary study at an elementary school is also described and discussed.

关键词： Students

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An analysis of group regulation patterns in collaborative inquiry learning

An analysis of group regulation patterns in collaborative in...

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16th International Conference on Computers in Education, ICCE 2008

作者： Chung, Chen-Wei Kuo, Wang-Hsin Liu, Chen-Chung Department of Computer Science and Engineering National Central University Taiwan Graduate Institute of Network Learning Technology National Central University Taiwan

ISBN: (纸本)9789868473522

Collaborative inquiry learning has gained a lot of attentions among educators for improving student learning. However, students still have difficulties in formulating testable hypotheses, designing conclusive experiments and attending compatible data. The formation of cognitive strategies is an internal process that may be concealed in individuals due to the concurrently cooperation of collaborative inquiry learning. This study attempted to explore the link between awareness of cognitive strategies and peer interactions in collaborative inquiry activity. By gathering the data from 56 college students, who involved experimental physics course as 17 groups, this study utilized handheld devices as an observational tool for peer interactions in a collaborative inquiry activity. The results show the awareness of cognitive strategies which distributed among group members affects peer interaction significantly. This finding suggest that designer of learning environment should consider team members about the importance of the internal process of individuals in collaborative work. In addition, asynchronous awareness which was concealed first then became visible, in an activity could inform more participation and accountability for collaboration. Furthermore, we proposed four peer cooperation models that could provide teachers and designers to configure groups to attain favorable interaction patterns.

关键词： Students

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Effects of virtual opponents in video game on students with different fluency

Effects of virtual opponents in video game on students with ...

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16th International Conference on Computers in Education, ICCE 2008

作者： Wu, Frank S.H. Cheng, Hercy N.H. Reynolds, Barry Lee Graduate Institute of Network Learning Technology National Central University Taiwan Department of Computer Science and Information Engineering National Central University Taiwan

ISBN: (纸本)9789868473522

Many researchers are concerned about the effects of video games on learning, especially the games with virtual opponents;therefore, the main purpose of this paper is to investigate the possible impacts. The authors designed Forest Defense, a digital game for practicing mental arithmetic, with two modes: training and challenge modes. In the challenge mode, students have to face virtual opponents which have not been shown in the training mode. A preliminary experiment was conducted to examine the effects of the challenge mode in Forest Defense. The results showed that virtual opponents did not influence the accuracy of the high-ability students, but significantly decreased the accuracy of the low-ability students. The results also suggested that if practicing more, the low-ability students were more able to face virtual opponents.

关键词： Students

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Not sugar, but salt: Pet-nurturing game model for student learning

Not sugar, but salt: Pet-nurturing game model for student le...

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16th International Conference on Computers in Education, ICCE 2008

作者： Chen, Zhi-Hong Tang, Taylor Tseng, Yu-Fu Chen, Pokey Chan, Tak-Wai Department of Computer Science and Information Engineering National Central University Taiwan Graduate Institute of Network Learning Technology National Central University Taiwan

ISBN: (纸本)9789868473522

In this paper, the relationship of learning and game activities is emphasized. The sugar design perspective is identified from the literature, and then we propose another salt design perspective. Based on the salt perspective, a pet-nurturing game, named My-Pet, is developed and applied to both Internet and one-to-one classroom. The results of these trial studies examined the system feasibility, and revealed that learners are motivated and interested in such game-based learning. Some implications about the tradeoff between two different perspectives and the possibility of using in formal schooling were also discussed.

关键词： Students

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Enhancing pupils' concept of leading teamwork through digital game approach

Enhancing pupils' concept of leading teamwork through digita...

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16th International Conference on Computers in Education, ICCE 2008

作者： Chien, Tzu-Chao Chang, Tina C.T. Chen, Zhi-Hong Graduate Institute of Network Learning Technology National Central University Taiwan Department of Computer Science and Information Engineering National Central University Taiwan

ISBN: (纸本)9789868473522

Developing the teamwork concept is necessary in the period of elementary education. The essence of teamwork not only involves the descriptive knowledge but also the skills, behavior and attitude. In the traditional education, knowledge is transferred from teachers, but not based on the real situation. In this study, we help pupils to learn a new abstractive concept through exquisite simulation game. Pupils can repeat trial and error and get immediate feedbacks from the game. We also explain how this game encourages the pupils to rethink and understand a complex concept.

关键词： Problem solving

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Nurturing My-Pet: Promoting effort-making learning behavior by animal companions

Nurturing My-Pet: Promoting effort-making learning behavior ...

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16th International Conference on Computers in Education, ICCE 2008

作者： Chen, Zhi-Hong Liao, Calvin C.Y. Chien, Tzu-Chao Chan, Tak-Wai Department of Computer Science and Information Engineering National Central University Taiwan Graduate Institute of Network Learning Technology National Central University Taiwan

ISBN: (纸本)9789868473522

Virtual character is a significant application on the research field of technology enhanced learning. In this study, a nurturing My-Pet system was proposed to promote learners' effort-making behavior. For performing better in the competition, learners would be evoked to learn for improving the status of their My-Pets. A preliminary experiment was conducted, and the results revealed that participants had a more improved scores during a shorter period of time.

关键词： Animals

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An English dialogue companion system for supporting conversation practice

An English dialogue companion system for supporting conversa...

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16th International Conference on Computers in Education, ICCE 2008

作者： Huang, Yi-Ting Lin, Yi-Lung Yang, Jie-Chi Wu, Yu-Chieh Graduate Institute of Network Learning Technology National Central University Taiwan Department of Computer Science and Information Engineering National Central University Taiwan

ISBN: (纸本)9789868473522

In this paper, we proposed an English dialogue companion system, called EDC, using predicate argument structure by Support Vector Machine (SVM) classifier for semantic analyzer in order to support elementary students for learning English one on one. Three phases of learning activities were designed to enhance the English learning environment, which are the choosing learning companion phase, the conversation phase, and the teaching *** also conducted a between-subject design experiment to evaluate the effectiveness of the EDC system in terms of English achievement and using experience. Results of this study showed that there is no significant difference between the experimental group and the control group on English achievement. However, more than half subjects in the lower score group got higher score in post-test than in pre-test. Thus, we assumed that the system could be useful for students in the lower English achievement degree.

关键词： Semantics

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Effectiveness of pet-nurturing handheld game on the aspects of learner motivation

Effectiveness of pet-nurturing handheld game on the aspects ...

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16th International Conference on Computers in Education, ICCE 2008

作者： Liao, Calvin C.Y. Chen, Zhi-Hong Chan, Tak-Wai Graduate Institute of Network Learning Technology National Central University Taiwan Department of Computer Science and Information Engineering National Central University Taiwan

ISBN: (纸本)9789868473522

The purpose of this study was to examine the effects of a light-version pet-nurturing game, named My-Mini-Pet, in the handheld device. Two aspects of hand-held games (stimulative and sustainable aspects) are identified, and the sustainable aspect is emphasized in this paper. The My-Mini-Pet system is designed to maximum the effect of the sustainable aspect. A preliminary experiment was conducted, and the result revealed that overall motivation, attention, and relevance of participants in the experimental group were significantly different from these of participants in the control group. Some implications about experimental results were also discussed.

关键词： Motivation

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