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Now showing items 21-30 of 32
Low-density parity-check coding for high-density magnetic recording systems.
(2004)
Our strategy is to combine advanced signal processing techniques, the core of which is soft-decision iterative channel detection, with powerful low-density parity-check (LDPC) coding techniques.
Applications of iterative decoding to magnetic recording channels.
(2002)
Finally, Q-ary LDPC (Q-LDPC) codes are considered for MRCs. Belief propagation decoding for binary LDPC codes is extended to Q-LDPC codes and a reduced-complexity decoding algorithm for Q-LDPC codes is developed. Q-LDPC ...
An optimally well-localized multi-channel parallel perfect reconstruction filter bank.
(2003)
Joint uncertainty for the overall L-channel, one-dimensional, parallel filter bank is quantified by a metric which is a weighted sum of the time and frequency localizations of the individual filters. Evidence is presented ...
Coverage issues in wireless sensor networks.
(2006)
A fundamental issue in the deployment of a large scale Wireless Sensor Network (WSN) is the ability of the network to cover the region of interest. While it is important to know if the region is covered by the deployed ...
Improved nonlinear filtering for target tracking.
(2007)
The objective of this research is to develop robust and accurate tracking algorithms for various tracking applications. These tracking problems can be formulated as nonlinear filtering problems. The tracking algorithms ...
Mid-infrared emitter technology.
(2006)
As part of an effort to improve heat dissipation from mid-infrared laser materials during operation, work was performed on mounting laser bars in an epi-side-down configuration. Results obtained from packaging interband ...
Estimation of Doppler and polarimetric variables for weather radars.
(2001)
A method for estimation of Doppler spectrum and its moments as well as several polarimetric variables on pulsed weather radars is presented. This scheme operates on oversampled echoes in range, that is samples of in-phase ...
A study on mobile ad hoc networks equipped with free-space optical capabilities.
(2006)
A mobile ad hoc network (MANET) offers a cost-effective solution for communications in areas where infrastructure is unavailable, e.g. emergency response, disaster recovery, and battlefield scenarios. Traditional MANETs ...
Performance evaluation of CDMA systems.
(2001)
Also, various coding techniques are compared for the forward link of IS-2000 systems in this dissertation. The possible application of low-density parity-check (LDPC) coding in CDMA systems is investigated. Its performance ...
Digital signal processing on the unit sphere via a Ramanujan set of rotations and planar wavelets.
(2000)
We give a sufficient condition for a zonal function to be a strictly positive definite. A major result of this thesis is that we have proven Shreiner's result as a consequence of a more general representation-theoretic ...