The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The energy consumption issue of mobile devices has been widely studied recently. For instance, Smartphone users may recharge their mobile devices multiple times a day especially when users surf on the Internet through Wi-Fi or 3/4G networks. Although smartphone producers have put much effort to prolong the daily usage time of smartphones, e.g., equipping smartphones with large-capacity batteries,...
This paper studies the downlink sum-rate and energy efficiency (EE) of massive multiple-input multiple-output (MIMO) systems under the effect of channel aging caused by the movements of users. First, a closed-form expression of the downlink sum-rate where zero-forcing (ZF) precoder is adopted at the base station (BS) is derived. Based on the expression, the power-scaling law that when the number of...
In this paper, we presented a fairness-aware scheduling scheme in OFDM-based cognitive radio networks. Our objective is to maximize the systems energy efficiency while maintain the fairness among secondary users. In addition, many factors will be considered such as the channel quality, the interferences taken to the primary system and the total transmission power of the cognitive radio system. The...
Garbage Collection (GC) is still a major issue in JVM for both mobile and cluster computing. GC offloading is proposed to improve the performance of GC by delivering part or all of the operations into another dedicated GC hardware. However, the traditional offloading just offloads directly not considering the phase change of GC behavior, which can be classified into two different groups: minor GC...
Energy efficiency is the most important concern in mobile embedded system design. The conventional wisdom is that there is a tradeoff between energy efficiency and high-performance techniques, such as prefetching. Thus to reduce energy consumption and save chip area, hardware prefetchers are not implemented in most existing embedded mobile systems. However, modern embedded mobile systems have become...
In current embedded mobile systems design, the application processor (AP) is often woken up to service interrupts and user requests. However, this kind of wakeups from sleep is very expensive in terms of battery usage. In the observation that the operating system/driver workloads are very light-weight, in this paper we propose the Offload Co-Processor (OCP) SoC architecture. In the OCP SoC design,...
In this paper we introduce an architecture for hardware acceleration of Software Communication Architecture (SCA) components. Intercommunication, as well as responsiveness and power dissipation, is essential for the components of SCA. Thus, we studied the SCA to explore the hotspot function and optimize its overall performance to not only operate efficiently but also in an energy-efficient way. We...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.