Results 211 to 220 of about 206,717 (263)

Adaptive Spatial Scattering Modulation

IEEE Transactions on Wireless Communications, 2021
In this paper, two novel adaptive spatial scattering modulation (ASSM) algorithms, namely unequal transmission probability-based ASSM (UTP-ASSM) and equal transmission probability-based ASSM (ETP-ASSM), are proposed to pursue a better tradeoff between the computational complexity and spectral efficiency. According to available channel state information,
Jiliang Zhang 0001, Qingqing Li, Ling Yang 0002, Kyeong Jin Kim, Ping Yang 0005, Shengzhen Ruan   +5 more
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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 ...
Zhendong Zhou, Branka Vucetic, Mischa Dohler, Yonghui Li 0001   +3 more
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Triangular Constellations for Adaptive Modulation

IEEE Transactions on Communications, 2018
Adaptive modulation is widely employed to improve spectral efficiency. To date, square signal constellations have been used with adaptive modulation. In this paper, triangular constellations are considered for this purpose. Triangle quadrature amplitude modulation (TQAM) for both power-of-two and non-power-of-two modulation orders is examined.
Mahmoud Abdelaziz, T. Aaron Gulliver
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Matrix modulation and adaptive retransmission

Seventh International Symposium on Signal Processing and Its Applications, 2003. Proceedings., 2003
We consider different high rate space-time modulation methods and related (re)transmission strategies in a MIMO channel. The proposed matrix modulators exploit the MIMO channel in increasing the peak rate via power-efficient parallel transmission, whereas the self-orthogonalizing retransmission and signal combining strategies improve ultimate ...
Ari Hottinen, Olav Tirkkonen
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Adaptive modulation in microwave networks

ELMAR 2007, 2007
Since different types/levels of modulation have different spectral efficiency, gain of adaptive modulation has to be considered due to number of bits that are transmitted. We used model that has properties of white noise with probability of level occurence according to normal Gaussian distribution. In order to perform more exact calculation of the gain
Vražić, Zvonimir, Žagar, Dubravko, Grgić, Sonja   +2 more
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Module reuse by interface adaptation

Software: Practice and Experience, 1991
AbstractThis paper describes a language called Nimble that allows designers to declare how the actual parameters in a procedure call are to be transformed at run time. Normally, programmers must edit an application's source in order to adapt it for reuse in some new context where the interfaces fail to match exactly (e.g. the parameters may appear in a
James M. Purtilo, Joanne M. Atlee
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A Modified Adaptive Delta Modulator

IEEE Transactions on Communications, 1981
This paper presents the results of a study in data compression of adaptive delta modulated video signals. The Song mode ADM is first investigated at a sampling rate of 16 Mbits/s and shown not to produce enough redundancy to warrant entropy encoding. We then present a modified adaptive delta modulator algorithm that operates at a sampling rate of 16 ...
Joseph Barba, Norman Scheinberg, Donald L. Schilling, Joseph Garodnick, Sorin Davidovici   +4 more
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Reward modulates adaptations to conflict

Cognition, 2012
Both cognitive conflict (e.g. Verguts & Notebaert, 2009) and reward signals (e.g. Waszak & Pholulamdeth, 2009) have been proposed to enhance task-relevant associations. Bringing these two notions together, we predicted that reward modulates conflict-based sequential adaptations in cognitive control.
Braem, Senne, Verguts, Tom, Roggeman, Chantal, Notebaert, Wim   +3 more
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Concept of Adaptability in Space Modules

Journal of Aerospace Engineering, 1990
The space program is aiming towards the permanent use of space; to build and establish an orbital space station, a Moon base and depart to Mars and beyond. We must look after the total independency from the Earth's natural resources and work in the design of a modular space base in which each module is capable of duplicating one natural process, and ...
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An adaptively sampled delta modulator

ICASSP '80. IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005
A new approach to adaptive delta modulation is presented. This method adaptively adjusts the output pulse stream in a way that effectively provides signal tracking with no idle noise. Whereas conventional adaptive delta modulation schemes have a changing step size, the present approach can be viewed as adjusting the sample interval to achieve improved ...
H. F. Vanlandingham, J. F. Bogdanski Jr.
openaire   +1 more source