In this paper we propose a new form of adaptive modulation which has the ability of using the higher order modulation schemes such as 256-QAM and 128-QAM at low SNR values in order to enhance the data rate without degrading the SER performance especially at low SNR values. This new form of adaptive modulation is combined together with the power control and the PAPR clipping and filtering techni...

This contribution studies the impact of adaptive quadrature amplitude modulation (AQAM) on network performance when applied to a cellular network, using adaptive antennas in conjunction with both fixed channel allocation (FCA) and locally distributed dynamic channel allocation (DCA) schemes. The performance advantages of using adaptive modulation are investigated in terms of the overall network...

in this study, a new adaptive controller is proposed for position control of pneumatic systems. difficulties associated with the mathematical model of the system in addition to the instability caused by pulse width modulation (pwm) in the learning-based controllers using gradient descent, motivate the development of a new approach for pwm pneumatics. in this study, two modified feedback error l...

A set of optimum mode-switching levels is derived for a generic constant-power adaptive-modulation scheme based on a closed-form expression of the average bit error ratio (BER) and the average bits-per-symbol (BPS) throughput of the adaptive-modulation scheme. This results in a constant BER, variable-throughput arrangement. The corresponding BPS throughput performance and the achievable signal-...

Adaptive modulation, error control coding and power control are well-known techniques that have been applied to mobile wireless communication systems. These techniques, when designed to track the channel variations, yield a higher network throughput. In this research, we investigate the throughput returns due to the employments of various combinations of adaptive modulation, adaptive coding, an...

13 The focus of this review is to provide a thorough study of this link adaptation method particularly adaptive modulation and its related issues in various OFDM systems. The organization of this paper is as follows. Section II gives an overview of a typical OFDM system. Section III reviews significant adaptive modulation approaches contributed by several authors in detail. This section also in...

We study the adaptive behavior of a computational ecosystem in the presence of time-periodic resource utilities as seen, for example, in the day–night load variations of computer use and in the price fluctuations of seasonal products. We do so within the context of the Huberman-Hogg model of such systems. The dynamics is studied for the cases of competitive and cooperative payoff functions with...