Results 51 to 60 of about 7,178 (195)
Multiuser Detection for the Uplink of Prefix-Assisted DS-CDMA Systems Employing Multiple Transmit and Receive Antennas [PDF]
, 2006 In this paper we consider the uplink transmission within a DS-CDMA system employing CP-assisted (Cylic Prefix) block transmission techniques combined with spatial multiplexing techniques that require multiple antennas at both the transmitter and the ...
Dinis, Rui, Silva, Paulo
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Impact of Ionospheric Scintillations on GNSS Availability and Precise Positioning
Space Weather, Volume 23, Issue 2, February 2025.Abstract For many applications where accuracy, availability, and integrity are essential, such as geodetic positioning and civil aviation, Global Navigation Satellite Systems (GNSS) are indispensable. However, GNSS signal dependability is severely hampered by ionospheric disturbances, especially equatorial plasma bubbles (EPBs), particularly in ...
C. R. Aguiar +2 more
wiley +1 more source
Generalized orthogonal transmission system and its efficient implementation method
Tongxin xuebao, 2002 Based on subband transformation theory, a general model for orthogonal transmultiplexers is constructed. Besides several popular multiuser communication applications such as TDMA, FDMA and CDMA, it can also describe multi-carrier systems such as OFDM and
ZHANG Deng-yin, ZHENG Bao-yu
doaj +2 more sources
NORM Technique based PAPR Reduction in MC-CDMA Systems
Journal of ICT Research and Applications, 2015 Multicarrier code division multiple access (MC-CDMA) is one of the promising technologies for future-generation wireless networks. It offers high data rates, protection against frequency-selective fading and efficient utilization of the spectrum.
Noor Mohammed Vali Mohamad +5 more
doaj +1 more source
DDMA Signal Separation Method Based on Frame‐Interleaved Binary Mask
Electronics Letters, Volume 61, Issue 1, January/December 2025.To solve the problem of multi‐target separation failure at the same distance in empty‐band Doppler division multiple access system, we propose the frame‐interleaved binary mask method. This method can effectively separate multiple targets in above scenario. ABSTRACT Millimetre‐wave multiple‐input multiple‐output (MIMO) radar has many advantages such as
Lu Qian +3 more
wiley +1 more source
Design and Implementation of MC-CDMA Systems for Future Wireless Networks
EURASIP Journal on Advances in Signal Processing, 2004 The emerging need for high data rate wireless services has raised considerable interest in MC-CDMA systems. In this work, we describe an MC-CDMA system design process for indoor propagation scenarios.
Le Nours Sébastien +2 more
doaj +1 more source
Two-Dimensional Joint Acquisition of Doppler Factor and Delay for MC-DS-CDMA in LEO Satellite System
IEEE Access, 2020 Low Earth Orbit (LEO) satellite systems have received considerable attentions for its advantages and potential applications in global communication. Yet LEO satellite-ground communication is challenged by the huge Doppler shift.
Entong Meng, Xiangyuan Bu
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International Journal of Antennas and Propagation, Volume 2025, Issue 1, 2025.Accurate path loss prediction is vital for 5G deployment, especially at midband frequencies where signal degradation is significant. This paper presents a hybrid model that integrates an optimized COST‐231 Hata model with a random forest algorithm to improve prediction accuracy at 3.5 GHz.
Farouq E. Shaibu +6 more
wiley +1 more source
IB-DFE receiver techniques for CP-assisted block transmission within DS-CDMA and MC-CDMA systems [PDF]
, 2008 MC-CDMA (MultiCarrier Code Division Multiple Access), currently regarded as a promissing multiple access scheme for broadband communications, is known to combine the advantages of an OFDM-based (Orthogonal Frequency Division Multiplexing), CP ...
Dinis, Rui +2 more
core
Ant-Colony-Based Multiuser Detection for MC DS-CDMA Systems
, 2007 In this contribution we present a novel ant colony optimization (ACO) based multi-user detector (MUD) designed for synchronous multi-carrier direct sequence code division multiple access (MC DSCDMA) systems. The operation of the ACO-based MUD is based on
Hanzo, L, Xu, C, Yang, L-L
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