Accepted Paper

  • Preventive Customized Power Saving Modes for Smartphones
    Ahmed Sameh and Abdullah Almasri,College of Computer and Info Sciences, Prince Sultan University, Riyadh, KSA

    Current smartphones' power saving modes can be improved towards saving more power and/or gain more user satisfaction only if they start following “preventive” and/or user customized power saving plans. In this paper we develop a number of preventive power saving modes which will help in saving the battery power without the need of using the power of the same battery for detecting abusers (detective strategies). Another issue of current power saving modes is the “One Size Fits All” philosophy which does not take into consideration the factors that could distinguish different smartphone users, for example, the nature of the workspace of the user (Indoor/Outdoor), the age, the gender and/or the user’s applications categories of interests. The paper develops a strategy to match a smartphone power saving mode with its perfect smartphone user by classifying smartphones users into classes depending on a set of different factors and having the user to identify himself/herself to the smartphone before the first use. Experimental work provides evidence of the utility of the new proposal.

  • Adaptive Coding and Modulation Performance over Nonlinear Mobile Satellite Channels
    Mahdis Jalali, Abbas Mohammadi, Mina Baghani,Microwave and Wireless Communication Research Lab., Electrical Engineering Department, Amirkabir University of Technology, Tehran, Iran

    This paper investigates link adaptation in mobile satellite communications through adaptive coding and modulation scheme. Average spectral efficiency improvement has been obtained by adaptation algorithms while the error probability constraints are met. Satellite power amplifier nonlinearity is taken into account and optimized adapting procedure is proposed to overcome the resulting impairments. The accuracy and performance of physical layer adaptation was improved by implementing channel power prediction, mitigating large round trip time and fast channel variations. Results indicate satisfactory link availability even in severe shadowing states of channel.