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In this paper, we study the propagation of deadline- constrained content over wireless cellular network, in which the base station transmits a content to a certain set of users. The lifetime of a content is consumed in two aspects: waiting in the queue and transmitting. In our system, the base station first transmits the content to users with a certain data rate, such that some users may not directly...
The FSM-SADF model of computation allows to find a tight bound on the throughput of firm real-time applications by capturing dynamic variations in scenarios. We explore an FSM-SADF programming model, and propose three different alternatives for scenario switching. The best candidate for our CompSOC platform was implemented, and experiments confirm that the tight throughput bound results in a reduced...
In a Non Uniform Memory Access (NUMA) system, I/O to a local device is more efficient than I/O to a remote device. A device connected to the same socket having the CPU and memory offers a closer proximity for I/O operations. Modern microprocessors also support on-chip I/O interconnects with which the processor may drive I/O to a local device from the processor cache, without the need to interact with...
Dynamic dataflow models of computation (MoCs) have been introduced to provide designers with enough expressive power to capture increasing levels of dynamism in modern streaming applications. Among dynamic dataflow MoCs, parametrized dataflow MoCs hold an important place as they integrate dynamic parameters and run-time adaptation of parameters in a structured way. In this work, we analyze the temporal...
Most approaches to model interference in Wireless Sensor Networks (WSNs) focus primarily on establishing the basic conditions for successful communication between two nodes. However, no attempt has been made to devise models that arrest the propagation of interference-laden transmissions right at the source. As a consequence, faulty transmissions pervade the WSN, and the nodes are forced to receive...
Phase-change memory (PCM) has gained much attention recently since it offers several advantages over DRAM, such as high cell density and low leakage power. PCM has similar read power and latency as DRAM; however, its write power and latency are significantly higher than DRAM. Therefore, one challenge with PCM is how to increase write throughput under write power budget constraints. To increase write...
The performance of wireless scheduling algorithms directly depends on the availability and accuracy of channel state information (CSI) at the scheduler. As CSI updates must propagate across the network, they are delayed as they arrive at the controller. In this paper, we analyze the effect that delayed CSI has on the throughput performance of scheduling in wireless networks. By accounting for the...
We consider the problem of scheduling transmissions over a wireless downlink when channel state information (CSI) is not available to the transmitter. We assume channel states are time varying and evolve according to a Markov Chain. We show that using current QLI does not stabilize the system due to correlations between backlog and channel state. We show that the throughput optimal scheduling policy...
Multi-processor systems-on-chips are widely adopted in implementing modern streaming applications to satisfy the ever increasing computing requirements. Predictable memory hierarchies, which make memory access predictable, can better satisfy the strict timing requirements of streaming applications. However, different levels of the memory hierarchy vary in latency and capacity. Hence, the system performance...
The performance of wireless scheduling algorithms directly depends on the availability and accuracy of network state information at the scheduler. As channel state updates must propagate across the network, they are delayed as they arrive at the controller. The location of the controller directly affects the attainable throughput, as its dictates the delays with which information is obtained to make...
We build upon the clean-slate, holistic approach to the design of secure protocols for wireless ad-hoc networks proposed in part one. We consider the case when the nodes are not synchronized, but instead have local clocks that are relatively affine. In addition, the network is open in that nodes can enter at arbitrary times. To account for this new behavior, we make substantial revisions to the protocol...
A high-speed non-binary LDPC decoder based on Trellis Min-Max algorithm with layered schedule is presented. The proposed approach compresses the check-node output messages into a reduced set, decreasing the number of messages sent to the variable node. Additionally, the memory resources from the layered architecture are reduced. The proposed decoder was implemented for the (2304,2048) NB-LDPC code...
Underwater acoustic communication networks face several challenges: large propagation delays, low bandwidth and high transmission power. Recent studies exploit the large propagation delay to allow concurrent transmissions in the network. Given a suitable network geometry, it has been shown that the network throughput increases linearly with the number of nodes, provided optimal transmission schedules...
Existing temporal analysis and buffer sizing techniques for real-time stream processing applications ignore that FIFO buffers bound interference between tasks on the same processor. By considering this effect it can be shown that a reduction of buffer capacities can result in a higher throughput. However, the relation between buffer capacities and throughput is non-monotone in general, which makes...
We present a fully programmable layered LDPC decoder architecture together with an optimum mapping and scheduling algorithm. In contrast to other designs proposed in the literature, we use one-phase message passing. This allows for the first time the design of a fully programmable layered decoder. The proposed mapping and scheduling algorithm exploits the full parallelism of the architecture at any...
For most businesses, backup is a daily operation that needs to reliably protect diverse digital assets distributed across the enterprise. Efficiently processing ever increasing amounts of data residing on multiple desktops, servers, laptops, etc., and providing dynamic recovery capabilities becomes a high priority task for many IT departments. Driven by the advances in cloud computing and Software...
Measuring multiple physical quantities are increasingly being demanded in commercial, biomedical and generally in ubiquitous applications. Although the recent emergence of passive sensor enabled RFID tags (sensor tags) provide new opportunities for these types of applications mainly due to the extended operational life and the small form factor, the energy harvesting nature of sensor tags hinders...
In this paper we discuss different methods to design digital filters with low power consumption. One efficient method is based on power supply voltage scaling where the excess speed that may be obtained using maximally fast recursive filter structures or non-recursive structures are exploited. We also discuss several techniques to increase and obtain the maximal sample rate for recursive structures...
Day to day life people are using new technology and communication between user and it is easy in the new era, so the wimax is the worldwide interoperability microwave access(IEEE - 802.16) technology provide good accessibility to user and its results are better than the recent technology (2G,3G). In this paper I have implemented the performance and analysis result of wimax communication using recent...
We consider the problem of distributed resource allocation in a single-hop wireless network under the SINR model. The network consists of fixed transmitters and their distinct receivers, and the physical layer model we consider is the SINR threshold model, where the transmitter will be able to send data successfully to its receiver at a fixed rate if the SINR at the receiver is greater than a given...
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