Wed, 09 Jul 2008 13:33:53 BST CiteULike: dcastros Yeh http://www.citeulike.org/user/dcastro/author/Yeh CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/2877957 <i>Vehicular Technology, IEEE Transactions on, Vol. 46, No. 2. (1997), pp. 477-485.</i><br /><br />We derive a statistical model for the distribution of RMS delay spread (τ_rms) within a cellular environment, including the effects of base-to-mobile distance, environment type (urban, suburban, rural, and mountainous areas), and the correlation between delay spread and shadow fading. We begin with intuitive arguments that τ_rms should be lognormally distributed at any given distance d; that the median of this distribution should grow as some (weak) power of d and that the variation about the median should be negatively correlated with shadow fading gain. We then present empirical evidence, drawn from a wide array of published reports, which gives strong support to these conjectures. Finally, we combine our findings with the widely used model for path gain in a cellular environment. The result is a compact statistical model for the joint distribution of path gain and delay spread. The model lends itself readily to Monte Carlo simulation and is useful for performance studies of cellular systems with bandwidths up to tens of kilohertz A new path-gain/delay-spread propagation model for digital cellular channels LJ Greenstein V Erceg YS Yeh MV Clark doi:10.1109/25.580786 Vehicular Technology, IEEE Transactions on, Vol. 46, No. 2. (1997), pp. 477-485. 2008-06-09T19:33:11-00:00 1997 Vehicular Technology, IEEE Transactions on 46 2 477 485 digital model propagation http://www.citeulike.org/user/dcastro/article/2782032 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 53, No. 4. (2005), pp. 1331-1337.</i><br /><br />This paper presents a rigorous design of microstrip bandpass filters with a dual-passband response in parallel-coupled and vertical-stacked configurations. Based on resonance characteristics of a stepped impedance resonator (SIR), the second resonant frequency can be tuned over a wide range by adjusting its structure parameters. Emphasis is placed on filter synthesis for simultaneously matching in-band response and singly loaded Q by using tapped input/output couplings for the two designated passbands. Fractional bandwidth design graphs are used to determine proper geometric parameters of each coupled stage when filter specification is given. Realizable fractional bandwidths of the two passbands for a coupled SIR structure are clearly depicted in fractional bandwidth design graphs. Several experimental filters are fabricated and measured to demonstrate the design. Design of microstrip bandpass filters with a dual-passband response Jen-Tsai Kuo Tsung-Hsun Yeh Chun-Cheng Yeh doi:10.1109/TMTT.2005.845765 Microwave Theory and Techniques, IEEE Transactions on, Vol. 53, No. 4. (2005), pp. 1331-1337. 2008-05-09T23:51:22-00:00 2005 Microwave Theory and Techniques, IEEE Transactions on 53 4 1331 1337 bandpass filter microstrip http://www.citeulike.org/user/dcastro/article/2762254 <i>Microwave Symposium Digest, 1991., IEEE MTT-S International (1991), pp. 589-592 vol.2.</i><br /><br />A novel microwave optoelectronic mixer was fabricated on semi-insulating GaAs by monolithically integrating Schottky diode photodetectors into a microstrip ring resonator. Resistive mixing occurs when the conductance of the detector is modulated, and parametric amplification occurs when the capacitive reactance of the detector is modulated. The mixer shows very good potential for application in wideband fiber optic systems Resistive mixing and parametric up-conversion of microwave optoelectronic signals in a microstrip ring resonator GK Gopalakrishnan BW Fairchild CL Yeh CS Park K Chang MH Weichold HF Taylor doi:10.1109/MWSYM.1991.147071 Microwave Symposium Digest, 1991., IEEE MTT-S International (1991), pp. 589-592 vol.2. 2008-05-06T18:35:56-00:00 1991 Microwave Symposium Digest, 1991., IEEE MTT-S International 589 592 vol.2 mixer resonator ring http://www.citeulike.org/user/dcastro/article/2348227 <i>Antennas and Propagation, IEEE Transactions on, Vol. 51, No. 5. (2003), pp. 1124-1126.</i><br /><br />A compact dual-band planar inverted F antenna suitable for the application as a global system for mobile communication/digital communication system (GSM/DCS) dual-band mobile phone internal antenna is proposed and implemented. The proposed antenna has three resonant elements, two meandered metallic strips of slightly different lengths and one nearly-rectangular patch, which are printed on a supporting FR4 substrate and arranged in a compact configuration. These three resonant elements share a common shorting pin, and for the GSM (890-960 MHz) operation, the proposed antenna is operated with the two meandered strips both resonated as a quarter-wavelength structure, leading to a wide bandwidth formed by two resonant modes. For the upper band of the proposed antenna, three resonant modes are generated, two from the second higher-order modes of the two meandered strips and one from the nearly-rectangular patch, leading to a wide bandwidth covering the DCS band (1710-1880 MHz). The antenna design and experimental results are presented. Dual-band planar inverted F antenna for GSM/DCS mobile phones Shih-Huang Yeh Kin-Lu Wong Tzung-Wern Chiou Shyh-Tirng Fang doi:10.1109/TAP.2003.811524 Antennas and Propagation, IEEE Transactions on, Vol. 51, No. 5. (2003), pp. 1124-1126. 2008-02-07T07:55:22-00:00 2003 Antennas and Propagation, IEEE Transactions on 51 5 1124 1126 antenna dual-band gsm mobile pifa http://www.citeulike.org/user/dcastro/article/2002695 <i>Broadcasting, IEEE Transactions on, Vol. 45, No. 4. (1999), pp. 400-409.</i><br /><br />Channel estimation techniques using pilot tones in OFDM systems are investigated. Two time-domain channel estimation methods are proposed. Based on theoretical analysis and computer simulation, for a channel with multipath distortion and AWGN, the proposed time-domain channel estimation schemes perform better than the conventional frequency-domain channel estimation techniques Channel estimation using pilot tones in OFDM systems Che-Shen Yeh Yinyi Lin Broadcasting, IEEE Transactions on, Vol. 45, No. 4. (1999), pp. 400-409. 2007-11-28T10:19:17-00:00 1999 Broadcasting, IEEE Transactions on 45 4 400 409 channel estimation ofdm pilot system