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 136 for “"Fading Channels"”.
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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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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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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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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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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
… (EGC) receiver in correlated Nakagami-m channels, which had defied a simple solution in the past. The framework facilitates efficient evaluation of the mean and variance of coherent EGC output signal-to-noise ratio, outage probability and average symbol error probability for a broad range …
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Wavelet Modulation in Gaussian and Rayleigh Fading Channels
… performance of wavelet modulation in Gaussian channels. This paper extends the investigation to the performance of wavelet modulation in time varying channels. We show that bit error rate (BER) wavelet demodulation performance in the additive, white, Gaussian noise (AWGN) channel is comparable …
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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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Communication for wideband fading channels : on theory and practice
… theoretic aspects of communication over wideband fading channels and their applicability to design of signaling schemes approaching the wideband capacity limit. This work thus leads to enhanced understanding of wideband fading channel communication, and to the proposal of novel efficient signaling …
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Coded still image transmission over very slow fading channels
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Communication Strategies for Single-User and Multiuser Slow Fading Channels
… we design spatial diversity techniques for slow-fading wireless channels. There are two parts to this thesis: In Part I we propose spatial diversity techniques for point-to-point single-user wireless systems, while in Part II we propose multiuser cooperative diversity techniques for multiuser …
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Performance analysis of collaborative hybrid-arq protocols over fading channels
Impairments due to multipath signal propagation on the performance of wireless communications systems can be efficiently mitigated with time, frequency or spatial diversity. To exploit spatial diversity, multiple-antenna technology has been thoroughly investigated and emerged as one of the most …
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Cooperative retransmission protocols in fading channels : issues, solutions and applications
Future wireless systems are expected to extensively rely on cooperation between terminals, mimicking MIMO scenarios when terminal dimensions limit implementation of multiple antenna technology. On this line, cooperative retransmission protocols are considered as particularly promising technology …
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Performance Study of OFDM over Fading Channels for Wireless Communications
… the performance of OFDM over different channels is the main focus of this research. Channels' environments simulated in Matlab are additive white Gaussian noise (AWGN) and fading channels. Each channel affects the process of transmission in a certain way. Simulation results will make us …
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On Communication Over Correlated Fading Channels With Practical Power Constraints
… system performance, especially in the context of fading channels. They derived an upper bound to the probability of error, called the expurgated bound. Here, the proof of the expurgated bound is shown to be flawed. A new upper bound is also derived. It is not known whether the original expurgated …
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Error exponents for multipath fading channels : a strong coding theorem
… that achieves the capacity of the multipath fading channel under an average power constraint in the limit of infinite bandwidth. These bounds constitute a strong coding theorem for the channel as they not only delimit the range of achievable rates, but also give us a relationship among the …
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