Results 211 to 220 of about 224,801 (264)
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Adaptive cooperation protocol with adaptive modulation and coding
Signal, Image and Video Processing, 2020In this paper, we propose two adaptive cooperation protocols for wireless systems. The first protocol chooses between cooperative communications (CC) and non-cooperative communications (NCC), the protocol that offers the highest instantaneous throughput.
Nadhir Ben Halima, Hatem Boujemâa
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Adaptive coded modulation for fading channels
IEEE Transactions on Communications, 1998We propose a variable-power and variable-rate coded MQAM modulation technique for high-speed data transmission on fading channels. Coding gain is obtained by superimposing trellis codes designed for AWGN channels on the adaptive modulation, and we obtain the same coding gains as these codes exhibit in AWGN.
A J Goldsmith
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MIMO Systems With Adaptive Modulation
IEEE Transactions on Vehicular Technology, 2005Adaptive 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 +3 more
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Triangular Constellations for Adaptive Modulation
IEEE Transactions on Communications, 2018Adaptive 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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Module reuse by interface adaptation
Software: Practice and Experience, 1991AbstractThis 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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Reward modulates adaptations to conflict
Cognition, 2012Both 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 +3 more
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A Modified Adaptive Delta Modulator
IEEE Transactions on Communications, 1981This 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 +4 more
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Matrix modulation and adaptive retransmission
Seventh International Symposium on Signal Processing and Its Applications, 2003. Proceedings., 2003We 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, 2007Since 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 +2 more
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An adaptively sampled delta modulator
ICASSP '80. IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005A 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.
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