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收集所有交通大學研究人員與學生個人或團體所發表之各項學術著作，涵蓋期刊論文、教師專書、學位論文等項。;;Collections of Publications of NCTU Researchers and Students Like Journal Papers and Thesis.

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Subject: search.filters.subject.CDMA

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Now showing 1 - 10 of 36
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    APPLICATION OF CODE DIVISION MULTIPLE ACCESS TECHNOLOGY IN READOUT CIRCUIT AND SYSTEM DESIGN FOR AN ULTRA-THIN ON-CELL FLEXIBLE CAPACITIVE TOUCH PANEL
    (2019-01-01)
    Lin, Ying-Jia
    ;
    Su, Ying-Cheng
    ;
    Chao, Paul C. -P.
    ;
    Zhang, Jia-Yu
    ;
    Pribadi, Eka Fitrah
    A capacitive sensing circuit including electrodes for a 7-inch ultra-thin flexible on-cell touch panel has been designed. Implementing code-division multiple sensing (CDMS) with Walsh transform to scan Tx electrodes is chosen to improve the signal-to-noise ratio (SNR). The algorithm applies to field programmable logic array (FPGA). The sensing readout algorithm is applied to work on 4 Tx transmitter electrodes and 4 Rx sensing electrodes. The switched-capacitor (SC) circuit is applied to avoid disturbing sample signal from parasitic capacitance and enlarge the voltage difference from capacitance changes of the touch panel. 12-bit ADC to transfer the front-end analog signal to digital code. The digital part adopts a correction algorithm to eliminate the background value of the panel, the moving average algorithm has an adjustable signal-to-noise ratio function, and the Walsh conversion demodulation algorithm improves the touch report rate to achieve high SNR with up-to 34 dB.
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    Scheduler design issues for wireless high-speed data systems
    (2004-01-01)
    Huang, CY
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    Su, HY
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    電子工程學系及電子研究所
    ;
    Department of Electronics Engineering and Institute of Electronics
    To understand the tradeoff between the system throughput and the user fairness, in this paper, two different scheduler design concepts are discussed and evaluated based on the full-buffer data model and finite packet-call-size data model. In finite packet-call-size data model, we will show analytically and by simulation that the system throughput depends on the number of active users and the user's in-slot rates. In order to quantify the impacts, a simulation platform is developed based on IxEV-DO technology.
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    A Framework for Simultaneous Message Broadcasting Using CDMA-Based Visible Light Communications
    (2015-12-01)
    Chen, Yan-Ann
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    Chang, Yi-Ting
    ;
    Tseng, Yu-Chee
    ;
    Chen, Wen-Tsuen
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    資訊工程學系
    Internet of Things applications are fast growing recently. One of the things that has a lot of potential is the lighting equipment since it is widely used in our daily life. Recently, the technology of visible light communication (VLC) has been widely discussed. VLC has several advantages, such as freedom of license, line-of-sight security, and less health concern compared with radio-based systems. In addition, the rapid progress of light emitting diode (LED) technology by solid-sate lighting allows VLC to be easily deployed and integrated with the existing lighting infrastructure at low costs. However, VLC, when integrated with lighting infrastructure, is usually for one-way communication and is highly sensitive to external interfering light. Thus, transmitting or broadcasting multiple messages simultaneously over a visible light channel without any preprocessing may result in serious collisions. In this paper, we propose a framework to tackle these problems by optical code division multiple access (CDMA) for VLC. With our approach, a VLC receiver can enter an environment without any prior configuration and can be designed with simple hardware. Even a mobile device with a high-resolution photodiode sensor can be used as a receiver. We demonstrate an application of indoor positioning by querying the location service provider on the Internet with the IDs decoded from the received light signals. The prototyping results reveal some communication properties of CDMA-based VLC and its potential for indoor positioning applications.
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    雙址調位分碼系統的鎖相追蹤迴路
    (1996)
    張振壹
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    國立交通大學電信工程學系
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    OFDM/CDMA無線行動通訊傳收機之研究及實現---OFDM/CDMA系統之信號與編碼研究
    (1997)
    蘇育德
    ;
    SU YU TED
    ;
    交通大學電信工程學系
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    非同步跳頻式行動衛星系統之多用戶偵側研究
    (1997)
    蘇育德
    ;
    SU YU TED
    ;
    交通大學電信工程學系
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    整合設計環境建立及GSM基頻模組設計
    (1999)
    溫?岸
    ;
    交通大學電子工程系
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    無線寬頻網路之研究---子計畫I：TDMA/CDMA網路中之傳送及允諾控制(I)
    (1999)
    張仲儒
    ;
    CHANG CHUNG-JU
    ;
    交通大學電信工程系
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    階層式CDMA行動通信系統之架構設計及性能分析(I)
    (2001)
    王蒞君
    ;
    LI-CHUNWANG
    ;
    交通大學電信工程系