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 92 for “"Rayleigh fading"”.
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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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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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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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Coding and multiaccess for the energy limited Rayleigh fading channel
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1988.
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The impact of Rayleigh fading channel effects on the RF-DNA fingerprinting process
… that estimates the coefficients of an indoor Rayleigh fading channel. The performance of the Nelder-Mead estimator is compared to the Least Square estimator and is assessed with degrading signal-to-noise ratio. The Rayleigh channel coefficients set estimated by the Nelder-Mead estimator is …
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Adaptive DS-CDMA multiuser detection for time variant frequency selective Rayleigh fading channel
… systems over time-variant frequency selective fading channels. In addition, channel acquisition and delay estimation techniques are developed to combat the uncertainty introduced by the wireless propagation channel. This work emphasizes fast and simple techniques that can meet practical needs …
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Performance Evaluation of Cognitive Radio Spectrum Sensing Techniques through a Rayleigh Fading Channel
… of these spectrum-sensing techniques through a Rayleigh fading channel. In a wireless environment, a Rayleigh fading channel models the propagation of a wireless signal where there is no dominant line of sight between the transmitter and receiver. Understanding the performance of spectrum …
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Analysis of a Two-Branch Maximal Ratio and Selection Diversity System with Unequal Branch Powers and Correlated Inputs for a Rayleigh Fading Channel
… for analyzing two-branch diversity systems for a Rayleigh fading channel. In many cases the fading received at both branches (i.e. a two-antenna element system) is correlated because of the proximity of the antenna elements to each other. It is also not uncommon for a diversity system to use …
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A comparison of two novel channel coding techniques for CDMA
… channels and frequency non-selective Rician Fading (FNRF) channels. The performance of coded CDMA systems in frequency selective Rayleigh fading channels is also analyzed using simulation techniques. Both analytic and simulation results show that by using trellis codes or very low rate …
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Energy-Efficient Multicarrier and Multicarrier-CDMA Systems
… frequency-selective and frequency-non-selective Rayleigh fading channels. Power Penalty (PP) required over these channels are assessed for BPSK, QPSK, and -QPSK mappers in an OFDM system. It is observed that at BER, PP required is of the order of for frequency-non-selective and for …
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A hybrid-structure offset-QAM filter-bank multi-carrier MIMO system
… with FDE at the receiver in frequency selective Rayleigh fading channel. The Alamouti SFBC block coding is performed on the complex-orthogonal signal before OQAM processing, which resolves the problems of intrinsic interference when integrating OQAM/FBMC with MIMO. In better multipath channel …
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Self-concatenated coding for wireless communication systems
… White Gaussian Noise (AWGN) and uncorrelated Rayleigh fading channels. We designed both the symbol-based Self-Concatenated<br/>Codes considered using Trellis Coded Modulation (SECTCM) and bit-based Self- Concatenated Convolutional Codes (SECCC) using a Recursive Systematic Convolutional (RSC) …
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Design and analysis of transmission strategies in wireless relay networks
… scheme in both additive white Gaussian noise and Rayleigh fading channels is presented. Furthermore, it is shown that MIF scheme in Rayleigh fading channels can achieve a full diversity order. A distributed space-time coded soft information relaying in Rayleigh fading channels is also considered. …
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Energy-Efficient Collaborative Communications for Wireless Sensor Networks
… sensor networks in the presence of AWGN and Rayleigh fading without decreasing the quality of service of data transmission. Due to the reduction of energy consumption of wireless sensor networks, the life time of sensor networks is extended. In collaborative communications, a set of …
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Smart Antennas at Handsets for the 3G Wideband CDMA Systems and Adaptive Low-Power Rake Combining Schemes
… three channel models: loosely correlated fading channel model (LCFCM), spatially correlated fading channel model (SCFCM), and envelope correlated fading channel model (ECFCM). Each antenna signal is assumed to have independent Rayleigh fading in the LCFCM. In the SCFCM, each antenna signal …
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Adaptive Channel Estimation for Turbo Decoding
… filter is proposed for the turbo decoding on Rayleigh fading channels with noisy channel estimates. The extrinsic information generated from the turbo decoder has some priority information about the transmitted data bits, which can help us better understand the channel characters. By using the …
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Noncoherent Communication Over Fading Channels
… communication 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 …
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