Results 81 to 90 of about 31,082 (236)
Global Challenges, Volume 10, Issue 6, June 2026.This review examines the transition from rigid to flexible soil sensing technologies in the context of soil as a dynamic and heterogeneous environment. By integrating sensor types, sensing modalities, materials, fabrication and deployment strategies, and IoT‐enabled energy and communication approaches, it highlights geotextiles as scalable sensing ...
Ayse Feyza Yilmaz +7 more
wiley +1 more source
Singular value decomposition-based multiuser multiple-input multiple-output vector perturbation-aided downlink transmitter and lattice-reduction-assisted uplink receiver pair [PDF]
, 2012 : A full-duplex uplink/downlink (UL/DL) system having a UL transmitter/receiver (transceiver) pair and a DL transceiver is considered. Both the UL and DL are improved.
Li, J.-D., Liu, Wei, Li, C, Hanzo, Lajos
core
Initial synchronisation of wideband and UWB direct sequence systems: single- and multiple-antenna aided solutions [PDF]
, 2012 This survey guides the reader through the open literature on the principle of initial synchronisation in single-antenna-assisted single- and multi-carrier Code Division Multiple Access (CDMA) as well as Direct Sequence-Ultra WideBand (DS-UWB) systems ...
SeungHwan Won +3 more
core +1 more source
On generalized downlink beamforming with NOMA
Journal of Communications and Networks, 2017 Recently, nonorthogonal multiple access (NOMA) has been studied to increase the spectral efficiency of downlink in a multiuser system by exploiting the notion of superposition coding with successive interference cancellation (SIC). NOMA can be employed with downlink beamforming for downlink transmissions from a base station (BS) equipped with an ...
openaire +1 more source
Downlink Multiple Input Multiple Output Mixed Sparse Code Multiple Access for 5G System
IEEE Access, 2018 For downlink multiple-input multiple-output-sparse code multiple access (MIMO-SCMA) system, the convergence reliability of the detected codeword in each decision process is unsatisfactory at the message passing algorithm receiver. To address this problem,
Cheng Yan, Ningbo Zhang, Guixia Kang
doaj +1 more source
Spatial de-correlation of the UTRA-FDD radio channel
, 2000 For smart antenna deployment in Frequency Division Duplex (FDD) applications the downlink weight vector can be derived from the uplink steering vector, assuming a degree of correlation between these channels.
Allen, B, Beach, MA, Karlsson, Peter
core
An Improved Overloading Scheme for Downlink CDMA
EURASIP Journal on Advances in Signal Processing, 2005 Summary: An improved overloading scheme is presented for single-user detection in the downlink of multiple-access systems based on OCDMA/OCDMA (O/O). By displacing in time the orthogonal signatures of the two user sets that make up the overloaded system, the cross-correlation between the users of the two sets is reduced. For random O/O with square-root
Vanhaverbeke Frederik, Moeneclaey Marc
openaire +2 more sources
Iterative Near-Maximum-Likelihood Detection in Rank-Deficient Downlink SDMA Systems
, 2008 —In this paper, a precoded and iteratively detected downlink multiuser system is proposed, which is capable of operating in rankdeficient scenarios, when the number of transmitters exceeds the number of receivers.
Wei, C.Y. +3 more
core
On the analysis of switched-beam antennas for the W-CDMA downlink [PDF]
, 2004 Smart antennas are widely recognized as an enabling technology for addressing the demand of future wireless network capacity when employed in place of traditional fixed-coverage sector antennas.
Beach, Mark +5 more
core +1 more source
Deep Bidirectional LSTM Network Learning-Aided OFDMA Downlink and SC-FDMA Uplink
, 2021 In this paper, deep learning (DL)-aided signal detection is proposed for the orthogonal frequency division multiple access (OFDMA) in the downlink and for the single carrier frequency division multiple access (SC-FDMA) in the uplink. A deep bidirectional
Saha, Ritu +7 more
core +1 more source