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 97 for “"equalizer"”.
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Fractionally Spaced Blind Equalizer Performance Improvement
… blind adaptation techniques may force the equalizer to converge to a false minimum, depending on the initialization. The most commonly used blind adaptation algorithm is the Constant Modulus Algorithm (CMA). It is shown by simulation that a logarithmic error equation can make CMA converge …
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Sparse equalizer filter design for multi-path channels
… thesis, sparse Finite Impulse Response (FIR) equalizers are designed for sparse multi-path channels under a pre-defined Mean Squared Error (MSE) constraint. We start by examining the intrinsic sparsity of the Zero Forcing equalizers and the FIR Minimum MSE (MMSE) equalizers. Next the …
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A novel OFDM Blind Equalizer: Analysis and Implementation
… solution. In most wireless communications, an equalizer is implemented at the receiver to estimate the channel impulse response. This estimate can be fed back to the transmitter via a feedback channel, which can in turn help generate a sub-optimal transmission solution for the current …
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BER Modeling for Interference Canceling Adaptive NLMS Equalizer
Adaptive LMS equalizers are widely used in digital communication systems for their simplicity in implementation. Conventional adaptive filtering theory suggests the upper bound of the performance of such equalizer is determined by the performance of a Wiener filter of the same structure. However, …
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The "Equalizer" Administration: Managerial Strategies in the Public Sector
The purpose of this dissertation is to understand the managerial "action" of public administrators in the management of their organizations within the Brazilian context. The research seeks to understand the relationships between managers and formal management mechanisms by exploring the …
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A hybrid battery cell voltage equalizer considering thermal behavior and capacity fade characteristics
The thesis focuses on developing a robust, high-fidelity lithium-ion battery model adaptive to changes in operating temperature, aiming for accurate estimation of state of health (SOH). The thesis proposes two novel methods for lithium-ion battery SOH tracking and estimation using the developed …
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Exploring the properties of a combined differential-mode equalizer and common-mode filter
… thesis analyzes a combination differential-mode equalizer and common-mode filter (DME-CMF) realized on a two-layer microstrip board. Measurements up to 25 GHz are taken to explore the functionality of this device at and above the design frequency. The basics of S-parameters are reviewed, and the …
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An investigation into non-linear propagation of MSK with a view to specifying an adaptive equalizer
… which could be used in the design of an equalizer. The choice of adaptive equalizer is made based on criteria such as construction cost, circuit complexity, and performance improvement. It is known from ray model analysis that at a transmitting frequency of 23 GHz deep fading will only …
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A class of batch-iterative methods for the equalization of intersymbol interference channels
… fashion. The iterated-decision or multipass equalizer uses symbol decisions made during the previous iteration to cancel out both precursor and postcursor ISi during the current iteration. With each successive pass of the equalizer, the probability of symbol error decreases. Eventually, after …
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Adaptive Equalization for Indoor Channels
… covered in this work are the linear transversal equalizer (LTE), the fractionally spaced equalizer (FSE), the decision-feedback equalizer (DFE), and the maximum-likelihood sequence estimation (MLSE) equalizer. This work also covers adaptive algorithms for equalization including both the least …
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Simulation of adaptive equalization in two-ray, SIRCIM, and SMRCIM mobile radio channels
… the following structures: the linear transversal equalizer (LTE), the decision feedback equalizer (DFE), the lattice equalizer, and the maximum likelihood sequence estimation (MLSE) equalizer. Least mean square (LMS) and recursive least squares (RLS) algorithms are used as the adaptive algorithms …
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An investigation into the performance of a power-of-two coefficient transversal equalizer in a 34Mbit/s QPSK digital radio during frequency-selective fading conditions
… the investigations which follow. The adaptive equalizer was developed to combat the distortion introduced by frequency-selective fading. It achieves this by applying an estimate of the inverse of the distorting channel's transfer function. The theory on adaptive equalizers has been well …
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Non-Wiener Characteristics of LMS Adaptive Equalizers: A Bit Error Rate Perspective
Adaptive Least Mean Square (LMS) equalizers are widely used in digital communication systems primarily for their ease of implementation and lack of dependence on a priori knowledge of input signal statistics. LMS equalizers exhibit non-Wiener characteristics in the presence of a strong narrowband …
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Equalization Techniques For Multipath Mitigation in Aeronautical Telemetry
… waveforms. An adaptive version of the DF-MMSE equalizer is developed and applied to this application. In the presence of frequency selective multipath interference typically encountered in aeronautical telemetry, both equalization techniques are shown to provide reliable performance for FQPSK …
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High-Speed Serial Data Link Design and Simulation
… architecture uses a continuous-time receiver equalizer to equalize a channel with known frequency response. The second incorporates an adaptive decision feedback equalizer (DFE) for use in unknown or time-varying channels.
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Automatic Modulation Classication and Blind Equalization for Cognitive Radios
… to a CR scenario are addressed. A blind equalizer is another important signal processing component that a CR must possess since there are no training or pilot signals available in many applications. In a typical wireless communication environment the transmitted signals are subjected to …
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Analysis of and techniques for adaptive equalization for underwater acoustic communication
… the operation of a decision feedback equalizer. This thesis examines how to use physical models to improve the reliability and reduce the computational complexity of the decision feedback equalizer. The specific topics covered by this work are: how to handle channel estimation errors …
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Analysis of and techniques for adaptive equalization for underwater acoustic communication
… the operation of a decision feedback equalizer. This thesis examines how to use physical models to improve the reliability and reduce the computational complexity of the decision feedback equalizer. The specific topics covered by this work are: how to handle channel estimation errors …
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Receiver equalization for a 10 gigabit per second high-speed serial link in 65 nm CMOS technology
… 3.1 link in 65 nm CMOS technology. Two types of equalizers are implemented: a continuous time linear equalizer (CTLE) and a 1-tap full-rate decision feedback equalizer (DFE). The combined CTLE and DFE architecture is simulated with an rms receiver clock jitter of 5.3 ps and achieves a BER < …
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Equalization in continuous and discrete time for high speed links using 65 nm technology
… (CMOS), especially on designing both Tx and Rx equalizers. The equalizer is a key component in insuring communication as signals that propagate through some channel will have to endure insertion loss and cross talk, where this can cause two major problems: larger rise/fall times and lower signal …
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