Results 71 to 80 of about 798,977 (204)
Quantitative Guanidinium CEST‐Based pH Mapping at 3 T in Healthy and Pathological Muscle
NMR in Biomedicine, Volume 39, Issue 8, August 2026.Chemical exchange saturation transfer (CEST) enables high‐resolution pH mapping by measuring the exchange rate between guanidinium and water protons. The current method is based on the Z‐spectra fitting with Bloch–McConnell (BM) equations and allows us to detect pH variations on the order of 0.02 pH units in the very restrained pathophysiological pH ...
Valentin Henriet +4 more
wiley +1 more source
High‐Resolution Diffusion Kurtosis Imaging of Hippocampus Subfields Across the Healthy Lifespan
NMR in Biomedicine, Volume 39, Issue 8, August 2026.Developmental and aging changes were examined in the hippocampus using 1 mm isotropic diffusion kurtosis imaging in 363 participants aged 5–90 years. HippUnfold enabled automated subfield segmentation and unfolded hippocampal maps. Whole‐hippocampus showed distinct lifespan trajectories: volume, quadratic; MD, negative Gamma Variate; FA, positive Gamma
Pablo Stack‐Sanchez +3 more
wiley +1 more source
Fractionally Spread Multicarrier CDMA: A Multiple-Access Scheme for Various Wireless Channels
, 2003 In multicarrier code-division multiple-access (MCCDMA) the total system bandwidth is divided into a number of subbands, where each subband may use direct-sequence (DS) spreading and each subband signal is transmitted using a subcarrier frequency. In this
Yang, L-L., Hanzo, L.
core +1 more source
HELIOS ‐ Highly rEliable Links durIng sOlar conjunctionS
Radio Science, Volume 61, Issue 8, August 2026.Abstract During deep space missions, maintaining reliable communication between a spacecraft and Earth becomes particularly challenging during superior solar conjunctions, when the spacecraft passes behind the Sun relative to Earth. The highly ionized solar corona and solar wind create plasma inhomogeneities that severely affect radio signals, leading ...
A. Zeqaj +8 more
wiley +1 more source
Outage analysis and power optimization in uplink and downlink NOMA systems with Rician fading
Results in EngineeringNon-orthogonal multiple access (NOMA) stands as a promising technology with the potential to significantly enhance the performance of forthcoming wireless networks by leveraging its distinctive attributes.
Dipinkrishnan R, Vinoth Babu Kumaravelu
doaj +1 more source
On the MIMO Capacity for Distributed System under Composite Rayleigh/Rician Fading and Shadowing
International Journal of Antennas and Propagation, 2015 Wireless channels are commonly affected by short-term fading and long-term fading (shadowing). The shadowing effects must be taken into account also when mobility is present in the wireless scenario.
Santiago González-Aurioles +4 more
doaj +1 more source
Radio Science, Volume 61, Issue 8, August 2026.Abstract This paper explores the impact of natural phenomena on signal data transmission across various ionospheric communication channels. The study focuses on three primary phenomena: meteor trails prevalent in the middle‐ and lower‐latitude ionosphere, bubble and plume structures observed around the equatorial ionosphere, and magnetic‐storm‐induced ...
I. Bronfman +2 more
wiley +1 more source
Exact BER performance of asynchronous MC-DS-CDMA over Nakagami-m fading channels [PDF]
, 2008 In this contribution an accurate average bit error rate (BER) formula is derived for Nakagami-faded MC-DSCDMA in the context of asynchronous transmissions and random spreading sequences.
Smida, Besma +5 more
core +1 more source
Egyptian Informatics JournalMultiple Input and Output-Orthogonal Time–Frequency Selective (MIMO-OTFS) is considered one of the leading candidates for the beyond fifth generation (B5G) radio framework.
Arun Kumar +2 more
doaj +1 more source
Bit Error Rate Closed-Form Expressions for LoRa Systems under Nakagami and Rice Fading Channels
Sensors, 2019 We derive exact closed-form expressions for Long Range (LoRa) bit error probability and diversity order for channels subject to Nakagami-m, Rayleigh and Rician fading.
Claudio Ferreira Dias +2 more
doaj +1 more source