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 116 for “"Fading channel"”.
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Finite blocklength analysis of the MISO Coherent Block Fading Channel
The Coherent MISO Block Fading Channel is a wireless communication channel model in which the transmitter has access to multiple antennas while the receiver has access to one. This model is becoming increasingly important in communication networks because a base station is often able to use many …
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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
… 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 used to …
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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
… 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 sensing …
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Low-Complexity Iterative Receiver Design for Multi-Carrier Faster-Than-Nyquist Signaling Over Frequency-Selective Fading Channel
… quite challenging. Especially in multipath fading channels, the coupling of channel interference and self-interference imposed by MFTN signaling further increases the complexity of symbol detection and channel estimation in non-orthogonal transmission systems. Based on statistical signal …
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Performance analysis of Binary FSK signals with L-Fold diversity selection combining techniques in a Nakagami-M fading channel
… over a frequency non-selective, slowly fading Nakagami channel. These techniques are independent of the number of diversity branches, so simpler receivers can be employed. First order selection Combining (SC), second order Selection Combining (SC-2) and third order Selection Combining …
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New hybrid automatic repeat request (HARQ) combining with space time block coding (STBC) in invariant and variant fading channel
… and M receive antennas (NxM) in a time invariant channel and in a time varying channel is proposed and its performance is analyzed. Based on the measured channel matrix, the receiver chooses the best retransmission order and communicated it to the transmitter. The scheme, where this algorithm is …
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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
… 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 antennas with …
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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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New hybrid automatic repeat request (HARQ) scheme for 4x4 MIMO system, based on the extended alamouti quasi-orthogonal space-time bloc coding (Q-STBC), in invariant and variant fading channel
… Output (MIMO) system in invariant and variant fading channel conditions is proposed and analized. Based on the Extended Alamouti Quasi-orthogonal Space-Time Block Coding (Q-STBC), the use of the so-called Alternative Matrices for transmission, depending on the Channel State Information (CSI) …
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Analysis on the use of EM algorithm for space time coding in fading channels
… method of partial detected frame in slow, flat fading channel, it is found that the use of partial frame to estimate the mean is able to improve the EM algorithm further. In the study, the use of a minimum 2 symbols results in a BER performance improvement of 2dB as compared to the use of the …
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Dynamic channel allocation in satellite and wireless networks
… thesis is to understand how to utilize wireless channels in a fair and efficient manner within a multi-users communication environment. We start by exploring the allocation of a single wireless downlink fading channel among competing users. The allocation of a single uplink multiacccess fading …
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Simulation study of frequency estimators
… estimation in both additive white Gaussian noise channel and static fading channel. A new measurement model is proposed, which can describe the phase noise more accurately, thus improves the performance by 4 dB in the initial acquisition stage. Simulations show that the proposed estimator is …
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Performance of multi-user codes in wireless communications
… by a mobile station goes through different fading channels resulting. These multi-paths add constructively and destructively with different delays and attenuation at the mobile station. The autocorrelation and cross correlation properties of the Multi-user codes play a significant role in …
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On performance analysis of optimal diversity combining with imperfect channel estimation
… investigated for multipath Rayleigh and Ricean fading channel with additive white Gaussian noise where only imperfect channel knowledge is available at the receiver. The non-observable estimation error contributes as an additive source of noise which is not white. Therefore, the optimal …
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Error and erasure decoding for a CDPD system
… telephone network to transmit data with a channel hopping technique. The CDPD system employs Gaussian minimum shift keying (GMSK) as a modulation scheme and a Reed-Solomon code for error control to transmit high-quality data in the mobile and wireless environment. Most current CDPD …
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Concatenation of Space-Time Block Codes with ConvolutionalCodes
… help in combating the destructive effects of fading as well as improve the spectral efficiency of a communication system. Receive diversity techniques like maximal ratio receive combining have been popular means of introducing multiple antennas into communication systems. Space-time block …
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Performance of turbo coded DS-CDMA systems in correlated and uncorrelated satellite communication channels
… in the correlated and uncorrelated satellite fading channel. Turbo codes are known to give very good perfonnance results in A WGN channels, especially for very large input message length codes or interleaver sizes. It can be shown that good perfonnance of the turbo codes can be achieved with …
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