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 153 for “"channel estimation"”.
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Adaptive Channel Estimation for Turbo Decoding
… 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 soft extrinsic …
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Joint Pose and Radio Channel Estimation
… investigates the combination of pose and radio channel estimation. Pose is the knowledge of the position and orientation of a device whereas the radio channel describes the transmission medium between radio transmitters and receivers. The two subjects are both active research topics with a long …
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OFDM Channel Estimation with Artificial Neural Networks
… OFDM still suffers when passing through a noisy channel. In order to maximize the abilities of OFDM, channel effects must be corrected. Unfortunately, channel estimation is often difficult due to the nonlinearity and randomness present in a practical communication channel.</p> <p>Recently, …
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Channel Estimation Strategies for Coded MIMO Systems
… systems. In a multipath-rich wireless channel, deploying multiple antennas at both the transmitter and receiver achieves high data rate, without increasing the total transmission power or bandwidth. When perfect knowledge of the wireless channel conditions is available at the receiver, …
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Channel Estimation for OFDM Systems With Transmitter Diversity
… diversity can effectively combat multipath channel impairments due to the dispersive wireless channel that can cause deep fades in some subchannels. The combination of the two techniques, OFDM and transmitter diversity, can further enhance the data rates in a frequency-selective fading …
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Channel estimation in a two-way relay network
In wireless communications, channel estimation is necessary for coherent symbol detection. This thesis considers a network which consists of two transceivers communicating with the help of a relay applying the amplify-and-forward (AF) relaying scheme. The training based channel estimation technique …
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Optimal Detection with Imperfect Channel Estimation for Wireless Communications
… systems transmitting data through unknown fading channels, traditional detection techniques are based on channel estimation (e.g., by using pilot signals), and then treating the estimates as perfect in a minimum distance detector. In this thesis, we derive and investigate an optimal detector that …
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Channel estimation and signal enhancement for DS-CDMA systems
… space-time (S-T) transceiver design, and S-T channel parameter estimation for direct-sequence code-division multiple-access (DS-CDMA) systems. Using the Bayesian framework, various linear and simplified nonlinear multiuser detectors are proposed, and their performances are analyzed. The …
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Joint Positioning and Multipath Radio Channel Estimation and Prediction
… the topic of joint positioning and radio channel estimation and prediction. Both positioning and radio channel estimation have a long history of research with many publications but the combination of the two has so far at large been left unexplored. The reason for studying this topic is …
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Channel estimation for Gigabit Multi-user MIMO-OFDM Systems
The fundamental detection problem in fading channels involves the correct estimation of transmitted symbols at the receiver in the presence of Additive White Gaussian Noise (AWGN). Detection can be considered when the receiver is assumed not to know the channel (non-coherent detection), or …
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Diversity with practical channel estimation in arbitrary fading environments
… diversity combining in the presence of non-ideal channel estimates. The estimator structure is based on the maximum likelihood (ML) estimate and arises naturally as the sample mean of Np pilot symbols. The framework presented requires only the evaluation of a single integral involving the moment …
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Channel Estimation in TDD and FDD-Based Massive MIMO Systems
… to this thesis. In the first part, we study the channel estimation problem in frequency-selective multi-user (MU) multi-cell massive multiple-input multiple-output (MIMO) systems, where, a time-domain semi-blind channel estimation technique is proposed. Compared to frequency-domain, the …
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Channel Estimation Overhead Reduction for Downlink FDD Massive MIMO Systems
… the downlink (DL) suffer significantly from the channel estimation overhead. In this thesis, we propose a minimum mean square error (MMSE)-based channel estimation framework that exploits the spatial correlation between the antennas at the BS to reduce the latter overhead. We investigate how the …
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Channel Estimation in Single -Carrier and Multi-Carrier Communication Systems
… 802.16. Regardless of the communication systems, channel state information is required for reliable demodulation, and different structures pose distinctive channel estimation problems. This thesis studies channel estimation in single-carrier and multi-carrier systems, focusing on recent …
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Blind Identification of MIMO Systems: Signal Modulation and Channel Estimation
… well as how the received signals are affected (channel) by these impediments in order to appropriately mitigate them. This dissertation addresses the blind (unaided) identification of the signal modulations and the channel in a Multiple Input Multiple Output (MIMO) system. The method presented …
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Impact of Channel Estimation Errors on Space Time Trellis Codes
… the use of multiple transmit antennas with channel coding. This scheme provides capacity benefits in fading channels, and helps in improving the data rate and reliability of wireless communication. STTC schemes have been primarily designed assuming perfect channel estimates to be available …
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Iterative Decoding and Channel Estimation over Hidden Markov Fading Channels
… Typical applications have included signal estimation, frequency tracking, equalization, burst error characterization, and transmit power control. Of special significance to this thesis, however, has been the use of HMMs to model fading channels typical of wireless communications. This …
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Random numerical linear precoding and channel estimation in massive MIMO systems
Thesis presented in fulfilment of the requirements for the degree of Doctor of Engineering in Electronic Engineering in the Faculty of Engineering and the Built Environment at Durban University of Technology, 2021.
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Blind Channel Estimation and Multiuser Detection for Multi-Rate CDMA Communications
… wireless links. Currently, the study on channel estimation and multiuser detection for multi-rate DS/CDMA, which makes full use of the nature of multi-rate signals, is still at its early stage. The thesis deals with the application of subspace-based techniques to blind channel estimation …
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Algorithms and architectures for channel estimation in wireless CDMA communication systems
… division multiple access (CDMA) technology. The estimation of channel delays along with channel attenuation and phases of different users constitutes the first stage in the detection process at the receiving base station in a CDMA communication system. This stage, called channel parameter …
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