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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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Has files: YesSubject: search.filters.subject.direct-conversion receiver

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    Preamble-Assisted Estimation for Frequency-Dependent I/Q Mismatch in Direct-Conversion OFDM Receivers
    (2009-07-01)
    Sun, Ming-Fu
    ;
    Hsu, Terng-Yin
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    資訊工程學系
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    Department of Computer Science
    In direct-conversion orthogonal frequency division multiplexing (OFDM) receivers, the impact of frequency-dependent I/Q mismatch (IQ-M) with carrier frequency offset (CFO) must be considered. A preamble-assisted estimation is developed to circumvent the frequency-dependent IQ-M with CFO. The results of a simulation and an experiment show that the proposed method could provide good estimation efficiency and enhance the system performance. Moreover, the proposed scheme is compatible with current wireless local area network standards.
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    A Wide Tuning Range G(m)-C Filter for Multi-Mode CMOS Direct-Conversion Wireless Receivers
    (2009-09-01)
    Lo, Tien-Yu
    ;
    Hung, Chung-Chih
    ;
    Ismail, Mohammed
    ;
    電信工程研究所
    ;
    Institute of Communications Engineering
    A third-order channel selection filter for multi-mode direct-conversion receivers is presented. The filter is designed with a Butterworth prototype and with the target wireless applications of Bluetooth, cdma2000, Wideband CDMA, and IEEE 802.11a/b/g/n wireless LANs. Linear-region MOS transistors are used to perform voltage-to-current conversion. The wide tuning range is achieved by the current multipliers and linear voltage-to-current converters. Implemented in the TSMC 0.18 mu m CMOS process, the measurement results show that the filter can operate successfully over a cutoff frequency range of 500 kHz to 20 MHz, and is compliant with the requirements of different wireless applications. The power consumption is 4.1 mW to 11.1 mW for minimum and maximum cutoff frequencies respectively from a 1.2 V supply voltage. The circuit performance compares favorably with previously reported works.