Results 1 to 10 of about 680 (113)
A Comparison of TDD and FDD Massive MIMO Systems Against Smart Jamming
IEEE Access, 2020 Frequency division duplex (FDD) massive multiple-input multiple-output (MIMO) systems introduce a large overhead in downlink channel estimation in contrast to the time division duplex (TDD) mode.
S Mohammad Razavizadeh +2 more
exaly +3 more sources
A Resource Allocation Scheme in Half Duplex FDD (H-FDD) Systems for M2M Communications
IFAC Postprint Volumes IPPV / International Federation of Automatic Control, 2013 Abstract Machine to machine (M2M) communications among machines without human intervention have attracted more and more prominence due to high market potential in the near future. In this article, we propose a heuristic algorithm of allocating weighted per-user data rates for half duplex frequency division duplexing (H-FDD), and show how much ...
Jihwan P Choi +2 more
exaly +2 more sources
Numerical Assessment of Building Vibration Techniques Using Laboratory Models [PDF]
Port Said Engineering Research Journal, 2022 Experimental Modal Analysis (EMA) is one of the most attractive engineering fields nowadays, which specifies in the studies of modal parameters of existing small buildings under forced vibrations.
moataz Elrayes +2 more
doaj +1 more source
The effect of photobiomodulation on the brain during wakefulness and sleep
Frontiers in Neuroscience, 2022 Over the last seventy years or so, many previous studies have shown that photobiomodulation, the use of red to near infrared light on body tissues, can improve central and peripheral neuronal function and survival in both health and in disease.
Cecile Moro +11 more
doaj +1 more source
Design of a compact K-band transceiver front-end module
Dianzi Jishu Yingyong, 2023 A compact and low-cost transceiver front-end module is designed for point-to-point radio communication system in this paper. The transceiver module contains one receive channel, one transmit channel, two groups of LO synthesizers in limited area.
Wang Yi
doaj +1 more source
Informática y Sistemas, 2023 El proceso de extracción de níquel en Cuba se encuentra a cargo de dos plantas procesadoras del mineral, ubicadas en la región nororiental del país.
Daykenis Caballero Feria +1 more
doaj +1 more source
A market study of early adopters of fault detection and diagnosis tools for rooftop HVAC systems
Energy Reports, 2022 Retrofit fault detection and diagnosis (FDD) products are undergoing major advances in their ability to optimize the operation and maintenance of building heating, ventilation, and air conditioning (HVAC) systems as a result of advances in artificial ...
Mohammed G. Albayati +4 more
doaj +1 more source
Learning the CSI Recovery in FDD Systems
IEEE Transactions on Wireless Communications, 2022 We propose an innovative machine learning-based technique to address the problem of channel acquisition at the base station in frequency division duplex systems. In this context, the base station reconstructs the full channel state information in the downlink frequency range based on limited downlink channel state information feedback from the mobile ...
Wolfgang Utschick +4 more
openaire +4 more sources
On weakly null FDD'S in Banach spaces [PDF]
Israel Journal of Mathematics, 1993 In this paper we show that every sequence (F_n) of finite dimensional subspaces of a real or complex Banach space with increasing dimensions can be ``refined'' to yield an F.D.D. (G_n), still having increasing dimensions, so that either every bounded sequence (x_n), with x_n in G_n for n in N, is weakly null, or every normalized sequence (x_n), with ...
Odell, E. +2 more
openaire +3 more sources
On the Relation Between BDDs and FDDs
Information and Computation, 1995 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Bernd Becker 0001 +2 more
openaire +5 more sources