Patent
Systems methods and computer program products for generating and optimizing signal constellations
Gordon Taylor Davis,Ajay Dholakia,Fredy D. Neeser +2 more
- 29 Oct 1999
29
TL;DR: In this paper, a work constellation set is generated based on the initial ucode boundaries and the initial minimum signal level spacing, which is then iteratively adjusted to achieve an error probability target.
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Abstract: Methods, systems and computer program products are provided for constellation generation which determine initial ucode boundaries and an initial minimum signal level spacing. A work constellation set is generated based on the initial ucode boundaries and the initial minimum signal level spacing. The work constellation set is then iteratively adjusted so as to provide an adjusted work constellation set which achieves an error probability target. The adjusted work constellation set is then iteratively pruned so as to provide a pruned work constellation set which achieves a power limit. The pruned work constellation set is then iteratively fine-tuned so as to provide a final constellation set which is within a specified tolerance of the error probability target and/or the power limit.
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Citations
Patent
Audio spectral noise reduction method and apparatus
Daniel A. Kosek,Robert C. Maher +1 more
- 07 Mar 2005
TL;DR: In this article, a method of reducing noise in an audio signal, comprising the steps of: using a furrow filter to select spectral components that are narrow in frequency but relatively broad in time, using a bar filter, analyzing the relative energy distribution between the output of the furrow and bar filters to determine the optimal proportion of spectral components for the output signal, and reconstructing the audio signal to generate the output.
42
Patent
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Peter D. Karabinis
- 29 Mar 2010
TL;DR: In this article, a Fourier transform is used to distribute elements of the data vector over an available frequency space, thus providing robustness to channel anomalies such as fading and/or interference.
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Patent
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Peter D. Karabinis
- 25 May 2006
TL;DR: In this paper, a Gram-Schmidt Orthogonalization (GSO) procedure is used to generate a set of independent waveforms that satisfy a time-bandwidth constraint.
34
Patent
Systems and/or methods of increased privacy wireless communications
Peter D. Karabinis
- 21 Jan 2011
TL;DR: In this paper, a concatenated level of encryption/scrambling is proposed to increase the level of privacy and undetectability of transmitted signals in wireless communications, using pseudo-random generated signaling alphabets that are used by the mobile devices and by the system infrastructure to provide the communications.
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Wireless communications systems and/or methods providing low interference, high privacy and/or cognitive flexibility
Peter D. Karabinis
- 17 Feb 2009
TL;DR: In this paper, the authors describe a communication system that can provide extreme privacy, cognitive radio capability, robustness to fading and interference, communications performance associated with M-ary orthonormal signaling and/or high multiple access capacity.
26
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Patent
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Dirk Hughes-Hartogs
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Timing Recovery in Digital Synchronous Data Receivers
K. Mueller,M. Muller +1 more
TL;DR: A new class of fast-converging timing recovery methods for synchronous digital data receivers is investigated, and a general method is outlined to obtain near-minimum-variance estimates of the timing offset with respect to a given steady-state sampling criterion.
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Interpolation in digital modems. I. Fundamentals
TL;DR: The author describes the fundamental equation for interpolation, proposes a method for control, and outlines the signal-processing characteristics appropriate to an interpolator.
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Interpolation in digital modems. II. Implementation and performance
L. Erup,F.M. Gardner,R.A. Harris +2 more
TL;DR: The NCO-based control method presented in Part I is shown to be equivalent to a conventional phase locked loop and its operation is verified by simulation, demonstrating that simple interpolators give excellent performance.
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A space-time coding modem for high-data-rate wireless communications
TL;DR: The theory and practice of a new advanced modem technology suitable for high-data-rate wireless communications and its performance over a frequency-flat Rayleigh fading channel are presented and it is concluded that STCM can provide significant SNR improvement over simple delay diversity.
462