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A 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:scopusComparative 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: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:googlescopusCDMA ad hoc networks in multipath fading channels
Conference ObjectAbstract: This work analyses the effects of multipath diversity on the performance of wireless code division mPalabras claves:Autores:Celso de Almeida, Filho R.B., Ramos R.P., Rêgo M.G.Fuentes:scopusCapacity analysis of an ARQ scheme for multimedia DS-CDMA systems
ArticleAbstract: A multimedia DS-CDMA system using an ARQ reverse link for data transmission is proposed and analyzedPalabras claves:Autores:Carvalho V.R.D., Celso de AlmeidaFuentes:scopusCapacity loss of CDMA/PRMA protocol with imperfect power control loop for multimedia traffic
Conference ObjectAbstract: This paper analyzes by simulation the capacity loss due to imperfections in the power control loop fPalabras claves:Autores:Celso de Almeida, Hoefel R.Fuentes:scopusCapacity loss of CDMA/PRMA systems with imperfect power control loop
ArticleAbstract: The capacity loss of the joint CDMA/PRMA protocol owing to imperfections in the power control loop iPalabras claves:Autores:Celso de Almeida, Hoefel R.Fuentes:scopusAchieving optimum performance with ZF detector by using a novel precoding approach in spatial multiplexing MIMO systems
ArticleAbstract: Zero forcing (ZF) detector is unable to exploit all of the available diversity order of a spatial muPalabras claves:BER, Condition number, Maximum likelihood, Optimum performance, Spatial multiplexing MIMO systems, Zero-ForcingAutores:Celso de Almeida, Minango J.Fuentes:scopusData transmission efficiency over CDMA systems employing RLP and FEC error control strategies on the radio link layer
ArticleAbstract: In this article, the normalized throughput and the normalized average delay for the transport layerPalabras claves:Autores:Celso de Almeida, Filho R.B., NELSON BOLIVAR BENAVIDES CIFUENTESFuentes:googlescopusDoubling the Data Throughput in CDMA Cellular Networks
ArticleAbstract: In this paper we show how the data throughput of a CDMA cellular network can be doubled by using M-QPalabras claves:CDMA, cellular networks, Data throughput, M-QAM, MUD-D, Orthogonal sequences, Random sequencesAutores:Celso de Almeida, Gianini R.Fuentes:scopus