On Universal Space and Time
نویسندگان
چکیده
منابع مشابه
Universal space-time coding
A universal framework is developed for constructing full-rate and full-diversity coherent space–time codes for systems with arbitrary numbers of transmit and receive antennas. The proposed framework combines space–time layering concepts with algebraic component codes optimized for single-input–single-output (SISO) channels. Each component code is assigned to a “thread” in the space–time matrix,...
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This correspondence gives practical examples of space–time trellis codes performing as predicted by Root and Varaiya’s compound channel theorem. Specifically, 32-state and 64-state 2 2 space–time trellis codes are presented that provide a bit-error rate (BER) of10 on all2 2 matrix channels with an excess mutual information (MI) within 8% of the excess MI required by standard trellis codes of th...
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In this paper, first the space of hyperbolic tangent functions is introduced and then the universal approximator property of this space is proved. In fact, by using this space, any nonlinear continuous function can be uniformly approximated with any degree of accuracy. Also, as an application, this space of functions is utilized to design feedback control for a nonlinear dynamical system.
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In the absence of accurate channel probability distribution information or in broadcast scenarios, code design for consistent channel-by-channel performance, rather than average performance, may be desirable. Root and Varaiya’s compound channel theorem promises the existence of universal codes that operate with a consistent proximity to channel mutual information on any instance of the compound...
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Finite-time Lyapunov exponents of generic chaotic dynamical systems fluctuate in time. These fluctuations are due to the different degree of stability across the accessible phase space. A recent numerical study of spatially extended systems has revealed that the diffusion coefficient D of the Lyapunov exponents (LEs) exhibits a nontrivial scaling behavior, D(L)~L(-γ), with the system size L. He...
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ژورنال
عنوان ژورنال: Applied Mathematics
سال: 2014
ISSN: 2152-7385,2152-7393
DOI: 10.4236/am.2014.516243