Download PDF by F. Oggier, E. Viterbo, Frederique Oggier: Algebraic Number Theory and Code Design for Rayleigh Fading

By F. Oggier, E. Viterbo, Frederique Oggier

ISBN-10: 1933019077

ISBN-13: 9781933019079

Algebraic quantity idea is gaining an expanding impression in code layout for lots of various coding functions, corresponding to unmarried antenna fading channels and extra lately, MIMO platforms. prolonged paintings has been performed on unmarried antenna fading channels, and algebraic lattice codes were confirmed to be a good device. the final framework has been built within the final ten years and many particular code structures in response to algebraic quantity idea at the moment are to be had. Algebraic quantity idea and Code layout for Rayleigh Fading Channels offers an summary of algebraic lattice code designs for Rayleigh fading channels, in addition to an educational advent to algebraic quantity concept. the fundamental evidence of this mathematical box are illustrated through many examples and by way of machine algebra freeware with a view to make it extra obtainable to a wide viewers. This makes the e-book appropriate to be used by way of scholars and researchers in either arithmetic and communications.

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Extra info for Algebraic Number Theory and Code Design for Rayleigh Fading Channels (Foundations and Trends in Communications and Information Theory)

Example text

Among all possible packings of spheres we distinguish the lattice sphere packings which are obtained by centering at each point of a full-rank lattice Λ, identical spheres with the maximum radius such that they do non penetrate into each other. This particular radius ρ is called packing radius of Λ. If we restrict the problem to lattice sphere packings, we know the optimal lattice sphere packing up to dimension 8. The covering problem asks for the most economical way to cover the entire space with equal overlapping spheres (Fig.

The smallest radius for which the spheres still cover the entire space. R is also the distance of the furthest point of Rn from any lattice point. 4. Lattice Packings and Coverings 25 Fig. 6 The optimal 2-dimensional lattice covering. TEAM LinG TEAM LinG 4 The Sphere Decoder: A Universal Lattice Decoding Algorithm The Sphere Decoder is a ML decoder for arbitrary lattice constellations. , it finds the closest lattice point to a given received point. At the basis of the Sphere Decoder is the Finke–Pohst algorithm which enumerates all lattice points within a sphere centered at the origin [27].

The interest in lattice decoding has steadily grown in the last few years. This algorithm was also successfully applied to ML decoding of MIMO and DS-CDMA systems [25, 20]. An interesting alternative to the Sphere Decoding is given by the Shnorr–Euchner strategy presented in [1]. Further optimization of the decoding strategy based on the appro- TEAM LinG 36 The Sphere Decoder Å Ö « ÁÆÈÍÌ Å ½ Å ¹ Å Å ½ ´ ´«µ «µ ½ ½ Å Å Å ´Õ µ ɹ Ì Óд µ ½ Ò ÖÅ ½ ¾ ÌÒ Ë Ò Ä Ù Ô Ô ¹ ¹ Ì Ì ·½ ÈÈ ÈÈÈÈ ÈÈÈ È ÒÓ Ò Ý× Ù Ù · · Ë Ë ½ ½ ·½ ÈÈÈÈ È Ý × ÈÈÙÈÈÈÄ ÒÓ Ë ÈÈÈ ÈÈÈÈ ½ ÈÈ ¹ Ý× È ÇÍÌÈÍÌ Ù Õ Õ ¾ Ì ÒÓ ¾ ÌÒ ½ ½ · È Ò Õ ½ Ù Õ ´Ë Ù µ¾ Ì Ì½ · Õ½½ ´Ë½ Ù½ µ¾ ÈÈ ÈÈÈÈ ÈÈÈ È ¾ ÒÓ ½ ¾ Ý × ¹ Ù ½ Ù ¾ ÌÒ ¾ Ò ¹ ¾ Fig.

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Algebraic Number Theory and Code Design for Rayleigh Fading Channels (Foundations and Trends in Communications and Information Theory) by F. Oggier, E. Viterbo, Frederique Oggier


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