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Proliferation of mobile terminals pushes the limits of scalability, capacity and coverage to unremittingly sustain V2X services. Massive machine type communication has the potential to ensure the autonomous sustainability of stream QoS. Catering for diversified packet-based traffic flows in a ubiquitous framework dictates the inline evaluation of the queue status, a complex and arduous task for scalable...
Reverse proxies are key performance elements of a content distribution network (CDN) and operate as intermediaries between client and upstream (or origin) server traffic. A typical reverse proxy server aims to distribute user workload, more or less equally, among multiple upstream servers. To keep the pace with the growing demand for content, CDNs regularly expand their capacity by adding extra upstream...
Nowadays some High Level Synthesis (HLS) tools are introduced which are able to generate Hardware Description Language (HDL) codes from high level floating point arithmetic expressions for implementation on FPGAs. Before this conversion, changing the form of high level expressions usually leads to significant improvements in the final implementation in terms of accuracy, resource usage and latency...
Exploiting multi-user diversity (MUD) for multicast consists in choosing the data rate(s) utilized to serve a number of users who have different channel qualities. Some of the proposed multicast schemes aim to maximize the throughput (e.g. EMTH), while others seek to reduce the transmission time (e.g. EMTT). Actually, it is well known that the process of computing the accurate MUD multicast throughput...
Virtual Multiple-Input Multiple-Output (MIMO) is a promising uplink technology that can meet the throughput demand of Long-Term Evolution-Advanced (LTE-A) systems. However, the complexity of scheduling virtual MIMO is a challenge; existing virtual MIMO is therefore limited to best effort applications. We investigate the resource allocation and scheduling problem in a heterogeneous virtual MIMO system...
This paper demonstrates the reversible logic synthesis for the n-to-2n decoder, where n is the number of data bits. The circuits are designed using only reversible fault tolerant Fredkin and Feynman double gates. Thus, the entire scheme inherently becomes fault tolerant. Algorithm for designing the generalized decoder has been presented. In addition, several lower bounds on the number of constant...
This paper demonstrates reversible logic synthesis for (n, k) unidirectional logarithmic barrel shifters, where n is the number of data bits and k=log2n. The circuits are designed using only reversible fault tolerant Fredkin gates. Thus, the entire scheme inherently becomes fault tolerant. Several lower bounds on the numbers of garbage outputs and constant inputs have been proposed. The comparative...
This paper addresses the problem of flat output characterization for switched linear systems along with an extension to LPV systems. A condition which has a polynomial complexity with respect to the dimension of the system and a practical approach for checking this condition are provided.
This paper proposes a reversible logic based canonical signed digit (CSD) multiplier design which is optimized further using sub expression elimination applied to linear transformation. It is examined that using linear transformation the number of gates required can be reduced which is efficient in terms of logic utilization, delay and power. Moreover reversible circuits have been intensively studied...
Providing LTE connectivity to emerging Machine-to-Machine (M2M) applications imposes several challenges to the operation and optimization of current and future 3GPP mobile broadband standard releases. Scheduling in an efficient way M2M traffic over the existing LTE MAC infrastructure is decisive for the smooth evolution towards an M2M-enabled LTE system. The large number of connecting devices compared...
With the characteristics of wide time span, engineer-to-order, advanced technology to be adopted", "etc., Complex product systems (CoPS) innovation becomes a systematic project full of risks. Risk evaluation is the vital role in life-cycle process of the CoPS. Furthermore, the technical risk is major factor leading to cost, time and effectiveness risk. Because of the non-structural features...
We consider the problem of synchronizing prioritized data on two distinct hosts in disruption-tolerant networks (DTNs). To this effect, we propose and analyze a new interactive protocol for priority-oriented synchronization, called P-CPI, that is especially efficient in terms of bandwidth usage. This middleware protocol has features that are particularly useful for DTN routing in constrained or tactical...
In this paper we present an approach to provide efficient low-complexity video encoding for wireless sensor networks. We present a method based on removing the most time-consuming task, that is motion estimation, from the encoder. Instead the decoder will perform motion prediction based on the available decoded frame and send the predicted motion vectors to the encoder. We present results based on...
This paper introduces the key aspects of a new channel model based upon the Wireless World Initiative New Radio (WINNER)+ channel model for wireless channels in heterogeneous scenarios (e.g. indoor, outdoor and satellite scenarios). It consists of a collection of features created in the extended spatial channel model (SCME) and WINNER projects along with novel modeling approaches. The quasi deterministic...
In this paper, we propose several techniques to reduce the computation complexity of orthogonal chirp and orthogonal Olay code based synthetic aperture ultrasound systems. First, we minimize the complexity in terms of number of effective multiplications by choosing the system parameters for a specified SNR gain. The proposed method helps in reducing the complexity by about 20. Next, we consider a...
Nodes in large-scale network are always divided into many clusters in order to facilitate network management. Super-node based P2P network is an example. The physical scope and the number of clusters are two conflicting objectives and clustering algorithm should strike a balance between them. In this paper, nodes clustering problem is formally described and pre-optimized k-means algorithm is put forward...
A major challenge in low power sensor networks is collecting data from large number of nodes with low latency. Access point (AP) typically needs to poll large number of nodes individually and schedule transmission times for each of the nodes resulting in large latency. In this paper, we propose a physical layer technique that parallelizes the polling response from multiple nodes (so called parallel...
Efficient retrieval of replicated data from multiple disks is a challenging problem. Traditional retrieval techniques assume that replication is done at a single site using homogeneous disk arrays having no initial load or network delay. Recently, generalized retrieval algorithms are proposed to cover heterogeneous disk arrays, initial loads, and network delays. Generalized retrieval algorithms achieve...
With an increased number of processing elements on a chip, the transmission performance of traditional bus-based architecture attains to a bottleneck for system on a chip. To solve this issue, the Network-on-Chip concept was proposed. Congestion management mechanisms can be further improved performance in NoC, and they usually check congestion according to a specific message (buffer or link utilization)...
This paper explores a variation of the Han-Carlson adder for large word sizes and compares the performance of the new design with the traditional design. This work introduces a second type of design with two Brent-Kung stages each at the beginning and at the end and with Kogge-Stone stages in the middle, henceforth referred to as the “Hybrid Han-Carlson design.” With the new design, the Hybrid Han-Carlson...
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