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.
In cognitive radio networks (CRNs), the spectrum utilization can be dramatically improved with the secondary users (SUs) accessing the unoccupied licensed channels opportunistically. However, how to fully utilize the spectrum holes to meet the quality of service requirements of SUs is still an open issue. In this paper, we focus on multi-user, multi-channel case, and analyze the stable channel state...
In cognitive radio network (CRN), the utilization of wireless spectrum can be dramatically improved with the secondary user (SU) opportunistically access the licensed channels. With the help of spectrum sensing technology, the SU can dynamically access a large number of spectrum holes. However, how to allocate the spectrum holes between SUs becomes a thorny problem. The utilization of proper allocation...
Multicell collaboration is considered for power allocation in OFDMA downlink to mitigate the intercell interference. We propose a coordination approach to maximize the sum utility of a cluster of co-channel users by properly configuring user transmit power in local cells. In particular, we employ the well-known $\alpha$-PF metric as the utility function to accounts for the fairness between users in...
Today's multiprocessor system-on-a-chip (MPSoC) products typically have multiple execution modes, and for each mode, all the products utilize the same task allocation and schedule strategy determined at design stage. As these products experience different usages by customers, such unified solution can at best be optimized for a hypothetical common case. It is hence likely that the product is not reliable...
In a downlink orthogonal frequency division multiple access (OFDMA) system, allocating sub-channels and power across multi-user can require excessive feedback of channel state information. An efficient proportional fair scheduling algorithm based on cluster feedback scheme is proposed in the paper. Simulation results show that the scheme needs only little feedback information while maintaining guaranteed...
In the further advancements for the third generation (3G) long-term evolution (LTE) system, i.e. the LTE-Advanced system, carrier aggregation (CA) is applied to support wide system bandwidth and ensure backward compatibility. In this paper, two traffic load balance methods are proposed to improve the performance of the independent carrier scheduling (ICS) scheme in CA based LTE-Advanced system with...
For a stabilizable system, the extension of the control inputs has no use for stabilizability, but it is important for optimal control. In this paper, the necessary and sufficient condition is discussed for the strict decrease of the quadratic optimal performance index with control input extensions. The initial state set is determined for the case of non-strict decrease. A similar result is also provided...
This paper focus on the time optimal control problems with a class of dependent input constraints while all the input channels are dependent on the others. Based on such a class of constraints, a concept of control elimination is introduced, in which the optimal time will not increase when the idle and redundant input channels have been removed. Then, after examining the normality, we prove the existence...
With the ever-increasing transistor variability in CMOS technology, it is essential to integrate variation-aware performance analysis into the task allocation and scheduling process to improve its performance yield when building today's multiprocessor system-on-a-chip (MPSoC). Existing solutions assume that the execution times of tasks performed on different processors are statistically independent,...
In this paper, we consider energy minimization for multiprocessor system-on-a-chip (MPSoC) under lifetime reliability constraint of the system, which has become a serious concern for the industry with technology scaling. As today's complex embedded systems typically have multiple execution modes, we first identify a set of ??good?? task allocation and schedules for each execution mode in terms of...
In this paper, we consider the optimal resource allocation problem for dual-hop systems with a source-destination pair and multiple decode-and-forward (DF) relays. Orthogonal frequency division multiplexing (OFDM) is adopted in both hops. To maximize the system capacity, we formulate a mixed binary integer programming problem to optimally allocate the subchannels and transmit power for both the source...
This paper considers subcarrier allocation for the multihop orthogonal frequency division multiple-access (OFDMA) broadcast networks consisting of one source, multiple destinations, and one amplify-and-forward (AF) relay. In this paper, proportional fair (PF) based subcarrier allocation is discussed to get a tradeoff between the system transmission rate and fairness. First, the problem is formulated...
A two-hop relaying system where a source communicates with its destination through multiple relay nodes is studied for capacity maximization. Amplify-and-forward (AF) relaying is adopted for its simplicity. Taking the independent channel transfer function of different subcarriers and links into consideration, we formulate a resource allocation optimization problem for joint subcarrier assignment,...
With the relentless scaling of semiconductor technology, the lifetime reliability of embedded multiprocessor platforms has become one of the major concerns for the industry. If this is not taken into consideration during the task allocation and scheduling process, some processors might age much faster than the others and become the reliability bottleneck for the system, thus significantly reducing...
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.