Mostrando 10 resultados de: 79
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Electronics Letters(9)
AEU - International Journal of Electronics and Communications(5)
IEEE Vehicular Technology Conference(5)
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Comparative analysis of CDMA/PRMA and CDMA/ALOHA medium access schemes for packet transmission in third generation mobile communication systems
Conference ObjectAbstract: The voice-only traffic steady-state characteristics of a joint DS-CDMA/PRMA are derived. ConsideringPalabras claves:Autores:Celso de Almeida, Hoefel R.Fuentes:scopusComplexity Reduction of Convolutional and Turbo Decoding Based on Reliability Thresholds
ArticleAbstract: In this paper we propose a method that aims at reducing the complexity of convolutional and turbo dePalabras claves:Complexity reduction, convolutional codes, Turbo codesAutores:Celso de Almeida, Mataveli L.O.Fuentes:scopusBER Evaluation of Linear Detectors in Massive MIMO Systems under Imperfect Channel Estimation Effects
ArticleAbstract: New perspectives for wireless communications have brought new techniques, such as a very large numbePalabras claves:BER, imperfect channel estimation, massive MIMO, Maximal-Ratio Combining, minimum-mean-square error, Zero-ForcingAutores:Carlos Daniel Altamirano Carrillo, Celso de Almeida, Henry Ramiro Carvajal Mora, Minango J.Fuentes:scopusBER analysis of overloaded MC-CDMA cellular system employing sphere decoder in non-ideal sectorization scenario
Conference ObjectAbstract: New multiple access techniques aim to increase the spectral efficiency by overloading the system, i.Palabras claves:BER, Interference, MC-CDMA, Non-ideal-sectorization, Sphere-decoderAutores:Celso de Almeida, Henry Ramiro Carvajal Mora, Nathaly OrozcoFuentes:scopusBER of Massive MIMO in time-variant channels using multiplexed, superimposed and hybrid channel estimation techniques
ArticleAbstract: Massive MIMO (M-MIMO) is one of the most promising technologies towards fifth generation (5G) wirelePalabras claves:BER, Channel estimation, massive MIMO, Time-variant channels, Zero-forcing detectorAutores:Carlos Daniel Altamirano Carrillo, Celso de Almeida, Henry Ramiro Carvajal MoraFuentes:googlescopusBinary quadratic form: A solution to the set partitioning over GF(q)
Conference ObjectAbstract: Summary form only given, as follows. A general solution to the set-partitioning problem over GF(q) oPalabras claves:Autores:Celso de Almeida, Palazzo R.Fuentes:scopusA Low-Complexity Linear Precoding Algorithm Based on Jacobi Method for Massive MIMO Systems
Conference ObjectAbstract: In massive multiple-input multiple-output (MIMO) systems with the increase of the number of receivedPalabras claves:BER, channel capacity, Jacobi method, massive MIMO, Matrix inversion, Zero-ForcingAutores:Celso de Almeida, Minango J.Fuentes:scopusA hybrid transmission scheme employing opportunistic transmission and multiuser diversity
Conference ObjectAbstract: In this paper, we present a novel transmission scheme, which consists of a hybrid transmission methoPalabras claves:BER, Hybrid transmission, Multiuser diversity, opportunistic transmission, Spectral efficiencyAutores:Celso de Almeida, Henry Ramiro Carvajal Mora, Nathaly OrozcoFuentes:scopusA turbo multiuser detector based on samples reliability
ArticleAbstract: A turbo multiuser detector based on the reliability of the samples is proposed. Reliability thresholPalabras claves:Complexity reduction, Samples reliability, Viterbi algorithmAutores:Celso de Almeida, Mataveli L.O.Fuentes:scopusConstruction of signal sets matched to Abelian and Non-Abelian groups
Conference ObjectAbstract: We present an algorithm for the construction of signal sets matched to abelian and non-abelian groupPalabras claves:Autores:Celso de Almeida, Interlando J.C., Palazzo R.Fuentes:scopus