Results 21 to 30 of about 188,879 (245)
Q-learning algorithm based mine adaptive OFDM modulation
Gong-kuang zidonghua, 2021 When the traditional adaptive OFDM (Orthogonal Frequency Division Multiplexing) modulation technology based on fixed signal-to-noise ratio threshold is applied to complex mine channels, the feedback channel state cannot completely match the actual ...
ZHU Jingru +3 more
doaj +1 more source
MIMO Systems With Adaptive Modulation
IEEE Transactions on Vehicular Technology, 2005 Adaptive modulation (AM) schemes in multiple input multiple output (MIMO) systems with a perfect or imperfect channel state information (CSI) at both the transmitter and receiver were investigated. Under an average transmit power and instantaneous bit error rate (BER) constraint, the transmit parameters including the subchannel transmit power and/or ...
Z. Zhou, B. Vucetic, M. Dohler, Y. Li
openaire +2 more sources
On the Adaptive Modulation for User-Centric Cell-Free Massive MIMO Systems
IEEE AccessThe cell-free (CF) systems are a key technology for future wireless networks, which exploit the scenario spatial macro-diversity to offer high channel capacity and link reliability, uniform user quality of service (QoS), and better coverage.
Danilo B. T. Almeida +6 more
doaj +1 more source
IEEE Access, 2019 A novel spectrally efficient optical transmission in a passive optical network (PON) with hexagonal quadrature amplitude modulation (QAM)-based adaptive modulated optical (AMO) orthogonal frequency division multiplexing (OFDM) is proposed and ...
Hyoung Joon Park +3 more
doaj +1 more source
Chaperonin activity modulates codon adaptation
Molecular Systems Biology, 2010 Mol Syst Biol. 6: 6 Since the discovery of the genetic code by Holley, Khorana, and Nirenberg, researchers have been fascinated by the apparent redundancy of synonymous codons that code for the same amino acid. Subsequent work led to the discovery that synonymous codons are not used randomly in coding sequences.
Sangjo Han, Philip M Kim
openaire +3 more sources
IEEE AccessLarge-scale media data, such as 3D point cloud videos, have received increasing attention as a key content type for 6G mobile communication services. When delivering large-scale media in real time, it is necessary to transmit high-resolution data to meet
Somin Park +4 more
doaj +1 more source
IEEE Access, 2019 In this paper, a novel channel quality indicator (CQI) prediction scheme for adaptive modulation and coding in high-speed mobility environments is proposed, where the wavenumber spectrum segmentation filters' bank is utilized to improve the estimation ...
Rong Zeng +3 more
doaj +1 more source
Attentional modulation of adaptation in V4 [PDF]
European Journal of Neuroscience, 2009 AbstractAdaptation and visual attention are two processes that alter neural responses to luminance contrast. Rapid contrast adaptation changes response size and dynamics at all stages of visual processing, while visual attention has been shown to modulate both contrast gain and response gain in macaque extrastriate visual cortex. Because attention aims
Andrew E, Hudson +3 more
openaire +2 more sources
Attention modulates visual size adaptation
Journal of Vision, 2015 The current study determined in healthy subjects (n = 16) whether size adaptation occurs at early, i.e., preattentive, levels of processing or whether higher cognitive processes such as attention can modulate the illusion. To investigate this issue, bottom-up stimulation was kept constant across conditions by using a single adaptation display ...
Kreutzer, Sylvia +2 more
openaire +3 more sources
IEEE Photonics Journal, 2021 Continuous-variable quantum key distribution (CV-QKD) with a real local oscillator (LO) experiences a phase attack security challenge due to the reference pulses transmitted along with quantum signals over an unsecure quantum channel.
Khaled Alaghbari +4 more
doaj +1 more source