Donnacha Daly - Profile on Academia.edu (original) (raw)
Address: Zurich, Zürich, Switzerland
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Papers by Donnacha Daly
IEEE Transactions on Signal Processing, 2004
We reformulate the minimum mean squared error (MMSE) solution for time domain equalization (TEQ) ... more We reformulate the minimum mean squared error (MMSE) solution for time domain equalization (TEQ) in multitone transceivers. We show that the maximum shortening signal-to-noise ratio (MSSNR) and minimum intersymbol interference (min-ISI) TEQs are particular cases of our new formulation. With good channel estimation, the MMSE-TEQ achieves near-optimal rate performance. Our algorithm is less sensitive to channel estimation errors than other methods.
The electricity market in Switzerland began liberalisation in 2008, with the passing of the Feder... more The electricity market in Switzerland began liberalisation in 2008, with the passing of the Federal Electricity Supply Act, and is still not fully liberalised. Owing to its relative immaturity, there is little in the way of centralised reporting of its stylised facts, a situation the current work attempts to rectify. As a guideline, a standard Hourly Price Forward Curve (HPFC) is developed. Since Switzerland does not yet boast a financial index for energy Futures, the implementation of this model is not straightforward. This issue is addressed by a quantitative market analysis based on regionally specific stylised facts. The resulting model also yields insights on the influence of bottom-up factors driving Swiss spot prices, in particular with regards to the relatively high share of hydro-power in Switzerland. We conclude with a discussion of this “Swiss-made” HPFC and its implications for the evolution of the Swiss market.
RFID markers are proving to be a cheap and reliable enabler for indoor positioning applications. ... more RFID markers are proving to be a cheap and reliable enabler for indoor positioning applications. Motivated by this we have developed a concrete embeddable passive RFID tag for robust and long-lasting way-point identification. Embedding commercially available passive tags in concrete significantly reduces their read range and hence, usefulness as markers. By appropriate redesign of the antenna and packaging we have extended hand-held readability of concrete embedded passive tags beyond one meter. This paper details the background R&D of our prototype tags, including test and measurement results.
This thesis explores three distinct philosophies for improving the efficiency of multi-carrier co... more This thesis explores three distinct philosophies for improving the efficiency of multi-carrier communication on the digital subscriber loop. The first topic discussed is impulse response shortening for discrete multitone transceivers. The minimum mean-squared error impulse response shortener is reformulated to allow near-optimal rate performance. It is demonstrated that the best existing eigen-filter designed channel shortener is a particular case of the proposed reformulation. An adaptive time-domain LMS algorithm is provided as an alternative to eigen-decomposition. The next part of the thesis examines bit-and power-loading algorithms for multitone systems. The problem of rate-optimal loading has already been solved. It is shown, however, that the rate-optimal solution does not give best value for complexity, and that near optimal schemes can perform very well at a fraction of the computational cost. The final section of the thesis is a brief exposition of the use of wavelet packets to achieve multi-carrier communication. It is proposed that the non-uniform spectral decomposition afforded by wavelet packet modulation allows reduced inter-symbol interference effects in a dispersive channel.
IEEE Transactions on Signal Processing, 2004
We reformulate the minimum mean squared error (MMSE) solution for time domain equalization (TEQ) ... more We reformulate the minimum mean squared error (MMSE) solution for time domain equalization (TEQ) in multitone transceivers. We show that the maximum shortening signal-to-noise ratio (MSSNR) and minimum intersymbol interference (min-ISI) TEQs are particular cases of our new formulation. With good channel estimation, the MMSE-TEQ achieves near-optimal rate performance. Our algorithm is less sensitive to channel estimation errors than other methods.
The electricity market in Switzerland began liberalisation in 2008, with the passing of the Feder... more The electricity market in Switzerland began liberalisation in 2008, with the passing of the Federal Electricity Supply Act, and is still not fully liberalised. Owing to its relative immaturity, there is little in the way of centralised reporting of its stylised facts, a situation the current work attempts to rectify. As a guideline, a standard Hourly Price Forward Curve (HPFC) is developed. Since Switzerland does not yet boast a financial index for energy Futures, the implementation of this model is not straightforward. This issue is addressed by a quantitative market analysis based on regionally specific stylised facts. The resulting model also yields insights on the influence of bottom-up factors driving Swiss spot prices, in particular with regards to the relatively high share of hydro-power in Switzerland. We conclude with a discussion of this “Swiss-made” HPFC and its implications for the evolution of the Swiss market.
RFID markers are proving to be a cheap and reliable enabler for indoor positioning applications. ... more RFID markers are proving to be a cheap and reliable enabler for indoor positioning applications. Motivated by this we have developed a concrete embeddable passive RFID tag for robust and long-lasting way-point identification. Embedding commercially available passive tags in concrete significantly reduces their read range and hence, usefulness as markers. By appropriate redesign of the antenna and packaging we have extended hand-held readability of concrete embedded passive tags beyond one meter. This paper details the background R&D of our prototype tags, including test and measurement results.
This thesis explores three distinct philosophies for improving the efficiency of multi-carrier co... more This thesis explores three distinct philosophies for improving the efficiency of multi-carrier communication on the digital subscriber loop. The first topic discussed is impulse response shortening for discrete multitone transceivers. The minimum mean-squared error impulse response shortener is reformulated to allow near-optimal rate performance. It is demonstrated that the best existing eigen-filter designed channel shortener is a particular case of the proposed reformulation. An adaptive time-domain LMS algorithm is provided as an alternative to eigen-decomposition. The next part of the thesis examines bit-and power-loading algorithms for multitone systems. The problem of rate-optimal loading has already been solved. It is shown, however, that the rate-optimal solution does not give best value for complexity, and that near optimal schemes can perform very well at a fraction of the computational cost. The final section of the thesis is a brief exposition of the use of wavelet packets to achieve multi-carrier communication. It is proposed that the non-uniform spectral decomposition afforded by wavelet packet modulation allows reduced inter-symbol interference effects in a dispersive channel.