Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 645 for “"fading"”.
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Fading of carbonless copying paper
… factors. Prolonged exposure to light causes fading of the zwitterion, the products from which are mainly demethylated species. It was shos.jn that the fading mechanism involves singlet oxygen production, by the dyestuff itself, which subsequently attacks the dye. Singlet oxygen quenchers …
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Noncoherent Communication Over Fading Channels
… scenario. For a Gauss-Markov Rayleigh fading channel, we derive upper and lower bounds for the mutual information generated by the Gaussian input distribution. The upper bound shows that the mutual information remains bounded at high SNR. We obtain necessary and sufficient conditions …
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Reliable communication over Rayleigh fading channels
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Multiaccess and fading in communication networks
… users and the time-varying nature of the fading wireless channel. We apply fundamental techniques in information theory and queueing theory to gain insights into the structure of these problems. In a terrestrial cellular or space network, multi-user interference arises naturally as …
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Turbo coding in correlated fading channels
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Doppler spread estimation in mobile fading channels
… a measure of the spectral dispersion of a mobile fading channel. Accurate estimation of the mobile speed is important in wireless mobile applications which require such as knowledge of the rate of channel variations. In this dissertation, first the performance of classical crossing- and …
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Broadband Fading Channels: Signal Burstiness and Capacity
… stationary and uncorrelated scattering (WSSUS) fading channel has a similar behavior in that the capacity per unit energy equals the capacity per unit energy of the AWGN channel with the same signal-to-noise ratio. The fourth-moment cost is generalized to a fourth-order functional called …
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Cellular power control in a fading environment
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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New Results on Selection Diversity over Fading Channels
… non-selective Rayleigh, Nakagami-m and Ricean fading channels. Aside from the classical selection diversity, generalized selection combining and the "maximum output" selection methods, two new selection rules based on choosing the branch providing the largest magnitude of log-likelihood ratio …
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Fading of Substituted phenylazo - B - naphthols on polyolefins
… main object of the present work was to study the fading of a series of substituted phenylazo-B-naphthol dyes on polypropylene by means of irradiation with short and long ultraviolet light sources, under aerobic and anaerobic atmospheres, respectively. It nas also intended that similar experiments …
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Rss Based Localization In A Rayleigh Fading Environment
… whose locations are known. Further, we assume fading is Rayleigh and that the propagation constant is constant but unknown. Also, we assume that modulation is spread spectrum and that either the sensors or agents are capable of resolving multipath components down to the chip level and are …
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Performance of Digital Communications Over Selective Fading Channels
… uncorrelated-scattering (WSSUS) fading channels is investigated. The emphasis is on the evaluation of the performance of binary differential phase-shift keyed (DPSK) and binary frequency-shift keyed (FSK) communications with primary emphasis on the effects of intersymbol …
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Transmit antenna selection in fading wireless communication systems
To address the drawbacks associated with multiple-input multiple-output (MIMO) systems, we propose the use of the transmit antenna selection technique. In transmit antenna selection, the best performing antenna(s) is selected from all the available transmit antennas for transmission. Transmit …
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Power and delay trade-offs in fading channels
… In such networks, communication takes place over fading channels. By varying the transmission rate and power based on the current fading level, a user in a wireless network can more efficiently utilize the available energy. For a given average transmission rate, information theoretic arguments …
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Analysis of Advanced Diversity Receivers for Fading Channels
… with non-independent and non-identical fading statistics is also presented. Finally, the thesis develops some closed-form solutions for a few integrals involving the generalized Marcum Q-function. Integrals of these types often arise in the analysis of multichannel diversity reception of …
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Wavelet Modulation in Gaussian and Rayleigh Fading Channels
… modulation; BER versus SNR curves for each fading channel show how the message at one rate can be more accurately recovered than at another rate. Furthermore, we also present results indicating the dramatic improvement in wavelet demodulation performance when multiple rates are available and …
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The Effects Of Systematically Fading Reinforcement While Maintaining Skills
1 PDF file (129 leaves)
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Retransmission strategies for moving networks over ricean fading channels
… reQuest (HARQ) for moving networks over Ricean fading channels has been considered. The scenario of interest consists of one receiver traveling at a given speed while connected to a wireless network based on OFDM (e.g., WiMax) through several base stations located along the path. Five different …
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