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 483 for “"cancellation"”.
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Improved successive interference cancellation schemes using selective pre-cancellation and cross- correlation
… complexity and processing time. Interference cancellation (IC) schemes allow BER improvement at the cost of processing time and complexity. We propose an alternate implementation called cross-correlation implementation (CCI) that can be applied to any IC scheme to reduce the processing time up …
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Wideband active antenna cancellation
… an adaptive filtering approach on active signal cancellation. The final system design demonstrates that, with a broadband interference source in close proximity to a receiver, it is possible to provide 30 dB of isolation by using active cancellation.
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Adaptive Blocker Cancellation For Wireless Receivers
This thesis targets cancellation of unwanted signals (blockers), one of the most difficult requirements for a wireless receiver. Current state-of-the-art analog filtering ADCs are analyzed and compared in detail. Recognizing that the analog circuitry requires accurate calibration and PVT …
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Selective cancellation of interference for CDMA
… shown that Multiple Access Interference (MAl) cancellation is a promising technique for improving the performance and capacity of the reverse link in a Code Division Multiple Access (CDMA) cellular system. However, it has beep observed that indiscriminate cancellation of all received signals …
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Adaptive noise cancellation using multichannel lattice structure.
… thesis presents a multichannel adaptive noise cancellation technique (MCLS) for cancelling the noise over nonlinear transmission channel. The technique applies to the situation in which the reference signal and noisy primary signal are collected simultaneously. The coefficients of the …
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Stereophonic Acoustic Echo Cancellation: Theory and Implementation
… aspects for stereophonic acoustic echo cancellation. In Paper I a complete implementation of a stereophonic acoustic echo canceler based on the two-channel fast recursive least-squares algorithm is presented. An analysis of the system calculation complexity is also given, in addition to …
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Van Kampen Diagrams and Small Cancellation Theory
… identity in G. In this thesis, we study small cancellation theory, developed by Lyndon, Schupp, and Greendlinger in the mid-1960s, which contributed to the resurgence of geometric group theory. We investigate the connection between Van Kampen diagrams and the small cancellation hypotheses. …
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3D echo cancellation in a home environment
… and compare various algorithms for the cancellation of echoes in a home environment, where the room impulse response is unknown and variable. The general problem, where the speaker's movements are completely unrestricted, is a very hard one, and research in this area has only begun in …
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Coupled-magnetic filters with adaptive inductance cancellation
Conventional filter circuits suffer from a number of limitations, including performance degradation due to capacitor parasitic inductance and the size and cost of magnetic elements. Coupled-magnetic filters have been developed that provide increased filter order with a single magnetic component, …
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Motion artifact cancellation for wearable photoplethysmographic sensor
… measurements around-the-clock, a motion artifact cancellation mechanism must be implemented to recover the blood volume pulse (BVP) from the corrupted signal. Various digital signal processing (DSP) approaches for motion artifact cancellation have been attempted in the past, but a reliable …
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Implementation and evaluation of echo cancellation algorithms
… issues associated with an integrated echo cancellation system, such as double-talk detection, finite precision effects, nonlinear processing, and howling detection and control. The use of a second adaptive filter is proposed, to reduce near-end ambient noise. Simulation results indicate …
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Dynamic Pricing with Early Cancellation and Resale
We consider a continuous time dynamic pricing model where a seller needs to sell a single item over a finite time horizon. Customers arrive in accordance with a Poisson process. Upon arrival, a customer either purchases the item if the posted price is lower than his/her reservation price, or leaves …
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Analogue self-interference cancellation in full-duplex radios
Active analogue self-interference cancellation (AASIC) techniques are used to prevent the saturation of the receiver chain in full-duplex (FD) radios. This is done by cancelling the self-interference (SI) signal before it enters the receiver chain. AASIC techniques are usually implemented together …
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Analogue self-interference cancellation in full-duplex radios
Active analogue self-interference cancellation (AASIC) techniques are used to prevent the saturation of the receiver chain in full-duplex (FD) radios. This is done by cancelling the self-interference (SI) signal before it enters the receiver chain. AASIC techniques are usually implemented together …
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Wide band TX Leakage Cancellation for FDD Transceivers
… conventional filtering techniques, an active cancellation system is required. This thesis will present a novel wide band TX leakage cancellation approach along with two new modelling techniques. The cancellation system is based on the analog finite impulse response (FIR) filter structure and …
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Solutions of Quadratic Equations in Small Cancellation Groups
… of the solutions of quadratic equations in small cancellation quotients of free groups and free products. Paul E. Schupp has obtained similar results for a restricted class of quadratic equations (those without constants). Some of the methods used here were previously employed by Leo P. Comerford …
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Advanced techniques for fast offset cancellation limit amplifiers
As the need for higher data rates to end users increases, new technologies are required. Passive optical networks promise a vast improvement over previous methods, but they require amplifiers which can quickly adapt to changing input power levels. This thesis proposes two methods for addressing …
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