naa a22 4500 510794785 CHVBK 20180411083332.0 cr unu---uuuuu 180411e20130401xx s 000 0 eng 10.1007/s11277-012-0663-x doi (NATIONALLICENCE)springer-10.1007/s11277-012-0663-x Space-Time Codebook Design for Spread Systems [Elektronische Daten] [Marko Beko, Rui Dinis] The problem of designing space-time constellations for communication in spread multiple-antenna wireless systems over Rayleigh fading channel is addressed. Using the asymptotic union bound on error probability as design criterion, codes based on general complex-valued symbols are obtained with a gradient search optimization technique. New space-time constellations are constructed and their performance is assessed. Simulation results show that the proposed technique achieves significant performance gains over existing schemes. Since the designed codebooks do not seem to possess any structure that could reduce the memory requirements for storing the corresponding codebook, the problem of designing structured space-time constellations is also addressed. To overcome this problem, a discrete Fourier transform-based approach is adopted to design structured codebooks and their performance is evaluated. The new structured codebooks also demonstrate significant improvement over state-of-art structured schemes. Springer Science+Business Media, LLC., 2012 Spread multiple-input multiple-output (MIMO) nationallicence Space-time coding nationallicence Fading channels nationallicence Performance analysis nationallicence Diversity methods nationallicence Beko Marko Universidade Lusófona de Humanidades e Tecnologias, Lisbon, Portugal aut Dinis Rui Departamento de Engenharia Electrotécnica, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal aut Wireless Personal Communications Springer US; http://www.springer-ny.com 69/4(2013-04-01), 1783-1797 0929-6212 69:4<1783 2013 69 11277 https://doi.org/10.1007/s11277-012-0663-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0663-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Beko Marko Universidade Lusófona de Humanidades e Tecnologias, Lisbon, Portugal aut NATIONALLICENCE 700 1- Dinis Rui Departamento de Engenharia Electrotécnica, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 69/4(2013-04-01), 1783-1797 0929-6212 69:4<1783 2013 69 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer