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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: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: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: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:googlescopusCapacity 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: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:scopusAn Opportunistic System to Counteract Fading and Gaussian Interference Effects under Different Modulation Schemes
ArticleAbstract: In this paper we propose an opportunistic transmission in which the fading characteristics and interPalabras claves:Cellular system, co-channel interference, Opportunistic System, Rayleigh Fading ChannelAutores:Celso de Almeida, Henry Ramiro Carvajal Mora, Nathaly OrozcoFuentes:scopusGeneral performance of detect-and-forward cooperative relaying in the presence of multiple interferers for optimum combining receivers
ArticleAbstract: Detect-and-Forward (DF) is a cooperative technique based on the retransmission of a detected versionPalabras claves:Antenna arrays, Detect-and-forward, Interference, Moment-generating function, Optimum combiningAutores:Câmara C.E., Celso de Almeida, Merino H.W.Fuentes:scopusEnabling Signal Space Diversity for MU-MIMO/OFDMA Cellular Systems That Employ Frequency Diversity
ArticleAbstract: Signal space diversity (SSD) is a technique to obtain diversity without loss in spectral efficiency.Palabras claves:Diversity methods, MIMO, Mobile Communication, multiple access interference, OFDMAutores:Celso de Almeida, Henry Ramiro Carvajal Mora, Nathaly Orozco, Paulo Chiliguano T.Fuentes:scopus