Results 21 to 30 of about 70,898 (211)

Detection Schemes With Low-Resolution ADCs and Spatial Oversampling for Transmission With Higher-Order Constellations in Terahertz Band

IEEE Access
In this work, we consider Terahertz (THz) communications with low-resolution uniform quantization and spatial oversampling at the receiver side, corresponding to a single-input multiple-output (SIMO) transmission.
Christian Forsch, Peter Zillmann, Osama Alrabadi, Stefan Brueck, Wolfgang Gerstacker   +4 more
doaj   +1 more source

Performance analysis of an ISMA DS-CDMA packet data network [PDF]

, 1999
The efficiency of MAC protocols for a packet switching DS-CDMA network strongly depends on the offered traffic statistic. For bursty sources where transmission needs are restricted to short message lengths, a protocol such as S-ALOHA can be efficient ...
Agustí Comes, Ramon, Pérez Romero, Jordi, Sallent Roig, José Oriol   +2 more
core   +1 more source

ENHANCEMENT OF CODE DIVISION MULTIPLE ACCESS (CDMA) WITHIN THE GSM SYSTEM IN IRAQ

Mağallaẗ Al-kūfaẗ Al-handasiyyaẗ
Despite the widespread adoption of Global System for Mobile Communications (GSM) in Iraq, the network's capacity and performance limitations have become increasingly apparent, particularly in urban areas with high user density. Currently, LTE (4G) is the
Nabil Abdulwahab Abdulrazaq Baban
doaj   +1 more source

Blind equalization of DS-CDMA and MC-CDMA modulations in time-variant frequency selective channels [PDF]

, 1999
The paper addresses the blind equalization problem of spread spectrum modulations in the presence of fast time-variant frequency-selective channels. The basic assumption of the paper is that the channel response exhibits fast changes.
Rey Micolau, Francesc, Vázquez Grau, Gregorio   +1 more
core   +1 more source

On the variable capacity property of CC/DS-CDMA systems [PDF]

, 2006
A complete complementary code based direct sequence code division multiple access (CC/DS-CDMA) system has been proposed recently as a potential candidate for beyond third generation (B3G) wireless communications.
Chen, HH, Song, YH, Wang, LP, Yang, Y
core   +1 more source

Statistical Modeling of Bit-Error-Rates in Asynchronous Multicarrier CDMA and Direct-Sequence CDMA Systems [PDF]

, 2004
This paper presents a method for modeling the bit-error-rate (BER) probability density functions (pdf) of asynchronous Multicarrier Code Division Multiple Access (MC-CDMA) and Direct-Sequence Code Division Multiple Access (DS-CDMA) systems.
Carey, Daniel, Roviras, Daniel, Senadji, Bouchra   +2 more
core   +2 more sources

Building a Continental‐Scale Geodetic Network: The Plate Boundary Observatory (PBO)

Perspectives of Earth and Space Scientists, Volume 7, Issue 1, December 2026.
Abstract The Plate Boundary Observatory (PBO) transformed the use of geodesy in North America to study crustal deformation and plate boundary processes by establishing a continental‐scale, standardized, open‐access geodetic network. Built and operated by UNAVCO between 2003 and 2018 as part of the National Science Foundation (NSF)‐funded EarthScope ...
Emily E. Zawacki, Michael E. Jackson, Glen S. Mattioli, David J. Mencin, Karl Feaux, Donna J. Charlevoix   +5 more
wiley   +1 more source

Mental Health Promotion Through Nursing Interventions Focused on Anxiety, Sleep and Well‐Being: A Scoping Review

International Journal of Mental Health Nursing, Volume 35, Issue 2, April 2026.
ABSTRACT Anxiety is more prevalent than other mental disorders and maintains a bidirectional relationship with sleep disturbances, negatively affecting well‐being and overall mental health. This scenario underscores the need to strengthen and qualify nursing practice in addressing these outcomes.
Louise Constancia de Melo Alves Silva, Samia Valeria Ozorio Dutra, Barbara Fernandes Ferreira, Yenifer Lizeth Gañan Rojas, Kauanny Vitoria Gurgel dos Santos, Carlos Jordão Assis de Silva, Hylarina Maria Montenegro Diniz Silva, Kátia Regina Barros Ribeiro, Daniele Vieira Dantas, Rodrigo Assis Neves Dantas   +9 more
wiley   +1 more source

Análise da Performance da Técnica MC/MC-CDMA

Trends in Computational and Applied Mathematics, 2007
A técnica Multi Portadora / Multi Código CDMA (MC/MC-CDMA) é analisada através de uma comparação do desempenho entre as técnicas Multi Código CDMA e Multi Portadora CDMA.
A.S. Araújo, G.A. Carrijo, E.L. Flores
doaj   +1 more source

Fixed-complexity quantum-assisted multi-user detection for CDMA and SDMA [PDF]

, 2014
In a system supporting numerous users the complexity of the optimal Maximum Likelihood Multi-User Detector (ML MUD) becomes excessive. Based on the superimposed constellations of K users, the ML MUD outputs the specific multilevel K-user symbol that ...
Botsinis, Panagiotis, Hanzo, Lajos, Ng, Soon Xin   +2 more
core   +1 more source