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 17 of 17 for “"decision-directed"”.
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Direct-form adaptive equalization for underwater acoustic communication
… is on applying concepts from inference and decision theory and information theory to provide an approach to deriving and analyzing adaptation algorithms. Limited work has been done so far on rigorously devising adaptation algorithms to suit a particular situation, and the aim of this thesis …
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Direct-form adaptive equalization for underwater acoustic communication
… is on applying concepts from inference and decision theory and information theory to provide an approach to deriving and analyzing adaptation algorithms. Limited work has been done so far on rigorously devising adaptation algorithms to suit a particular situation, and the aim of this thesis …
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Fast blind adaptive equalisation for multiuser CDMA systems
… as the Constant Modulus Algorithm (CMA) or the Decision Directed algorithm (DD), which has similar convergence properties as the LMS in the absence of decision errors, the CMA is relatively slow compared to the DD algorithm but more robust in converging to a suitable solution. This thesis is …
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A Hardware Implementation of a Coherent SOQPSK-TG Demodulator for FEC Applications
… and block recovery are described. This decision-directed demodulator is based on maximum likelihood principles, and is efficiently implemented by the soft output Viterbi algorithm (SOVA). The design is intended for use in a field-programmable gate array (FPGA). Simulation results of the …
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A High-Speed and Low-Noise Nanopore Amplifier and Event Detector
… on the cumulative sum technique but employs a decision-directed policy coupled with a post-decision correction mechanism to achieve at least a 10× accuracy improvement over a previously reported method. As a result the new technique can better accommodate high-speed embedded nanopore …
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Iterative receivers with channel estimation for MIMO and multi-user OFDM systems
… combinations of multi-user detectors (MUD) and decision-directed channel estimators are compared. The comparison focuses on the complexity-performance tradeoff for the receiver configurations. The results show that low complexity algorithms, despite requiring more receiver iterations, tend to …
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Simulation of Adaptive Array Algorithms for CDMA Systems
… (MT-LSCMA) and multitarget steepest-descent decision-directed (MT-SDDD) algorithm. It is shown from the simulation results that these two novel algorithms can outperform the other algorithms in all the test situations (e.g., AWGN channel, timing offset case, frequency offset case, and …
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Analysis and Development of Blind Adaptive Beamforming Algorithms
… well-known Constant Modulus Algorithm (CMA) and decision directed algorithm (DDA). New results on the behavior of the CMA and DDA are presented here, including analytic results on the convergence rate. Previous results have relied on Monte Carlo simulation. This framework is also used to propose …
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Communications over fading channels with partial channel information : performance and design criteria
… the inversion of a data-dependent matrix in decision-directed channel estimation. When CSI is not available, two noncoherent detection algorithms are formulated based on the generalized likelihood ratio test (GLRT). Numerical results are presented to demonstrate the use of GLRT-based …
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Iterative Decoding and Channel Estimation over Hidden Markov Fading Channels
… the thesis illustrates sequential and decision-directed techniques for using the aforementioned trellis based channel estimators <I>en masse</I> with an iterative decoder.
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Fast all-digital carrier synchronization techniques for linear modulation formats
… all-digital data-aided (DA) feedforward (FF) and decision-directed (DD) feedback (FB) carrier recovery (CR) techniques based on oversampling, suitable for linear modulation schemes ( M -ary phaseshift-keying ( M -PSK) and M -ary quadrature amplitude modulation ( M -QAM)). Carrier synchronization …
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Physically constrained maximum likelihood (PCML) mode filtering and its application as a pre-processing method for underwater acoustic communication
… rank pseudoinverse filter. Lastly, a linear, decision-directed, RLS equalizer is used to combine the response of several modes and its performance is compared with an equalizer applied directly to the data received on each hydrophone.
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Novel Estimation and Detection Techniques for 5G Networks
… domain, which enables the realization of a decision-directed (DD) one-shot blind channel estimator (OSBCE). The performance of the proposed estimator is evaluated in terms of the mean squared error (MSE), where an accurate analytical expression is derived and verified using Monte Carlo …
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Pre-compensation of nonlinear distortion of a silicon microring modulator in short reach systems
… the system BER performance. Thus a linear decision-directed least mean square (DD-LMS) equalizer and a Volterra nonlinear equalizer are implemented at the receiver to equalize the signal distortion induced by fiber dispersion. In order to verify the simulation results, experiment has been …
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Adaptive polarization mode dispersion equalizers for coherent optical communications systems
… equalizers perform slightly better than the decision directed least mean square (DD-LMS) counterparts at links with larger PMD values, whereas the opposite holds true for the low PMD regime. Due to their distinguishable performance in different regimes of the PMD, they provided an even better …
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Identification of impulsive interference channels
… the context of recursive estimation, a recursive decision-directed estimator for on-line identification of the parameters of the Class A model is proposed. This estimator is based on an adaptive, Bayesian classification of each of a sequence of Class A envelope samples as either an impulsive …
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Adaptive detection in ultrawide bandwidth wireless communication systems
… least square (RLS) algorithms. In our study decision directed (DD) approaches are also introduced to the adaptive detectors to improve the BER performance and spectral-efficiency of the hybrid DS-TH UWB systems. Our studies show that the complexity of the adaptive LMS and adaptive NLMS …