Results 31 to 40 of about 485,680 (303)
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
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Adaptive Modulation for Orthogonal Frequency Division Multiplexing [PDF]
Engineering and Technology Journal, 2012 Orthogonal frequency division multiplexing (OFDM) is one of the promising technologies to improve the spectral efficiency, enhance system capacity and mitigate inter-symbol interference in the wireless communication system.
Maher K. Mahmood, Abbas Salman Hameed
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Adaptive Modulation in Multi-user Cognitive Radio Networks over Fading Channels
, 2013 In this paper, the performance of adaptive modulation in multi-user cognitive radio networks over fading channels is analyzed. Multi-user diversity is considered for opportunistic user selection among multiple secondary users.
Foukalas, F., Khattab, T., Poor, H. V.
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Adaptive sliding mode observers in uncertain chaotic cryptosystems with a relaxed matching condition [PDF]
, 2006 We study the performance of adaptive sliding mode observers in chaotic synchronization and communication in the presence of uncertainties. The proposed robust adaptive observer-based synchronization is used for cryptography based on chaotic masking ...
Raoufi, R., Zinober, A.S.I.
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OFDM for Cognitive Radio Systems: Novel Power Allocation and Bit Loading Algorithms [PDF]
International Journal of Electronics and Telecommunications, 2019 A novel method to improve the performance of the frequency band is cognitive radio that was introduced in 1999. Due to a lot of advantages of the OFDM, adaptive OFDM method, this technique is used in cognitive radio (CR) systems, widely. In adaptive OFDM,
Shirin Razmi, Naser Parhizgar
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A Coded Bit-Loading Linear Precoded Discrete Multitone Solution for Power Line Communication [PDF]
, 2008 Linear precoded discrete multitone modulation (LP-DMT) system has been already proved advantageous with adaptive resource allocation algorithm in a power line communication (PLC) context.
Baudais, Jean-Yves +3 more
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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
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, 2007 The network performance of a frequency division duplex and time division duplex (TDD) code division multiple access (CDMA)-based system is investigated using system parameters similar to those of the Universal Mobile Telecommunication System.
Blogh, J.S., Hanzo, L., Ni, S.
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Adaptive Subcarrier PSK Intensity Modulation in Free Space Optical Systems [PDF]
, 2010 We propose an adaptive transmission technique for free space optical (FSO) systems, operating in atmospheric turbulence and employing subcarrier phase shift keying (S-PSK) intensity modulation.
Athanasios S. Lioumpas +6 more
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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
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