منابع مشابه
On Fast-Decodable Algebraic Space-Time Codes
In the near future, the 5th generation (5G) wireless systems will be established. They will consist of an integration of different techniques, including distributed antenna systems and massive multiple-input multiple-output systems, and the overall performance will highly depend on the channel coding techniques employed. Due to the nature of future wireless networks, space– time codes are no lo...
متن کاملOn diagonal algebraic space-time block codes
Theoretical and practical aspects of diagonal algebraic space-time block codes over n transmit andm receive antennae are examined. These codes are obtained by sending a rotated version of the information symbols over the principal diagonal of the n × n space-time matrix over n transmit antennae and n symbol periods. The output signal-to-noise ratios of two pre-decoding filters and two decoding ...
متن کاملMathematical Structures of Space-time * Mathematical Structures of Space-time
At first we introduce the space-time manifold and we compare some aspects of Riemannian and Lorentzian geometry such as the distance function and the relations between topology and curvature. We then define spinor structures in general relativity, and the conditions for their existence are discussed. The causality conditions are studied through an analysis of strong causality, stable causality ...
متن کاملAlgebraic Structures on Hyperkähler Manifolds Algebraic Structures on Hyperkähler Manifolds
Let M be a compact hyperkähler manifold. The hy-perkähler structure equips M with a set R of complex structures parametrized by CP 1 , called the set of induced complex structures. It was known previously that induced complex structures are non-algebraic, except may be a countable set. We prove that a countable set of induced complex structures is algebraic, and this set is dense in R. A more g...
متن کاملUniform Representation of Basic Algebraic Structures in Computer Algebra
This work presents a methodological framework suitable for the design of innovative sym bolic computation systems A signi cant set of basic algebraic structures is de ned and implemented by a uniform representation based on the algebraic structure of truncated power series By following this approach we succeed in avoiding the need for explicit coercion in computing with the de ned structures We...
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ژورنال
عنوان ژورنال: Linear Algebra and its Applications
سال: 1993
ISSN: 0024-3795
DOI: 10.1016/0024-3795(93)90342-l