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Device-to-Device (D2D) communications potentially can improve spectrum efficiency because of resource spatial reuse. In this paper, we consider a central-controlled D2D architecture, in which a cellular operator can decide whether mobile devices can connect to each other directly. We aim to maximize system throughput while also achieve fairness in resource allocation. A resource scheduling algorithm...
MapReduce is a widely used programming model for large scale data processing. In order to estimate the performance of MapReduce job and analyze the bottleneck of MapReduce job, a practical performance model for MapReduce is needed. Many works have been done on modeling the performance of MapReduce jobs. However, existing performance models ignore some important factors, such as I/O congestions and...
Cholesky decomposition has wide applications in solving many engineering and scientific problems. Acceleration is an important issue in many of these problems. In this paper, a hardware-based LLT Cholesky decomposition featuring high throughput has been presented to solve wiener filtering based on the minimum square error criterion. To achieve the best efficiency, the hardware-based implementation...
To solve the problems of control channel bottleneck and communication delay in multi-radio wireless sensor networks, this paper designs an asynchronous MAC protocol named UMD2-MAC in which a union mechanism of prime channel hopping(PCH for short) and control-channel reservation is used. The channel hopping makes sure that the average delay of selecting the same channel is small while the reservation...
Although work-in-process (WIP) balance approaches can achieve average cycle time reduction, due to the characteristics of wafer fabrication facilities (wafer fabs), e.g., re-entrant flow, setup time and batch processing, a lack of effective mechanism to ensure lot movement at the right pace results in degraded cycle time variance, which might be a potential problem when due date is concerned. This...
Studies in Dynamic Spectrum Access often consider aspects of primary communication in their schemes. However, the primary spectrum access modelling is generally over simplistic. This paper considers a realistic modelling of the primary traffic and list a series of parameters that should be considered during spectrum reuse. By modelling primary and secondary communications, a better understanding of...
Modern cloud storage requires a high throughput and low latency data protection system, which is usually implemented with an Advanced Encryption Standard (AES) hardware accelerator connected with CPU through PCI Express (PCIe). However, most existing systems cannot simultaneously achieve high throughput and low latency, as they impose conflicting requirements to the block size of packets used in PCIe...
Check node update processing for non-binary LDPC (NB-LDPC) architectures requires a large number of clock cycles, which limits the achievable throughput to tens of Mbps for high rate codes. In this work, we propose a new NB-LDPC architecture based on the Trellis-EMS (T-EMS) algorithm that reduces the number of clock cycles by a factor of dc, by adding an extra column to the trellis. This feature makes...
Wi-Fi devices are popular because of low cost and easy deployment, which lead to high density of WLANs in urban areas. Due to high density, WLANs suffer performance degradation unless networks interfering with each other can allocate wireless resource reasonably. Hence, our goal is to minimize the interference caused by high density of WLANs and in turn it helps improve throughput. In this paper,...
We study the throughput-vs-delay trade-off in an overlay multi-channel single-secondary-user cognitive radio system. Due to the limited sensing capabilities of the cognitive radio user, channels are sensed sequentially. Maximizing the throughput in such a problem is well-studied in the literature. Yet, in real-time applications, hard delay constraints need to be considered besides throughput. In this...
This paper presents a DDC (digital down converter) on NVIDA 580 GTX, which consists of a DDS (direct digital synthesizer), a CIC (cascade integrator comb) decimation filter and a FIR (finite impulse response) filter. The decimating factor of the CIC decimation filter can be arbitrary positive integer and the major concern is concentrated on how to drive it to work well while the decimating factor...
In an Orthogonal Frequency Division Multiple Access (OFDMA) system, cumulative distribution function (CDF) based scheduling can be applied to prioritize users. In such a wideband multiuser system, it is essential to reduce the typically very large feedback requirement. Herein, we consider a system in which several adjacent highly correlated subcarriers are grouped into a resource block. Then, the...
Flash-based solid-state drive has been proved to be a competitive alternative to mechanical disk for its high performance and low power consumption. But SSD still suffers from relatively high price and low density, which calls for consolidating device resource to bring down the cost of deploying expensive dedicated flash-based storage systems for specific applications. Within such environment, applications...
With recent advances in wireless systems, wireless in-band full duplex is proven possible. Prior work primarily allows a full duplex receiver to either send back a packet (bi-directional mode) or to forward another packet to its neighbor (secondary transmission). In our work, we look beyond a node pair and explore how a network can best utilize the full duplex capability. When a full duplex receiver...
In this paper, we propose an effective user association rule for resolving the unbalanced loading problem in multi-cell cellular networks. We first derive an improved user throughput estimation formula for the proportional fair (PF) scheduling algorithm under the Rayleigh fading environment. Our simple and accurate throughput estimation can be regarded as an extended version of the conventional scheme...
In this paper, we study the performance of joint spatial-temporal spectrum sensing based cognitive radio networks (CRNs). The relationship between spatial spectrum sensing and temporal spectrum sensing under the interference constraint of primary user is investigated. Both the spectrum sensing performance and throughput of secondary system is related to sensing duration, and we argue that there exists...
The energy consumption of a WBAN system can be divided into three parts: transmitting, sensing and channel switching. Considering the fact that the WBAN system are power-supply limited, the energy-efficient spectrum handoff schemes have been proposed by many previous works, aiming at extending the endurance life of a WBAN system. In this paper, we consider a WBAN system which access multiple PU channels...
Packet-based Networks-on-Chip (NoC) have emerged as the most viable candidates for the interconnect backbone of future Chip Multi-Processors (CMP). The flit size (or width) is one of the fundamental design parameters within a NoC router, which affects both the performance and the cost of the network. Most studies pertaining to the NoC of general-purpose microprocessors adopt a certain flit width without...
We develop a queuing model to evaluate production and subcontracting policies commonly used in an assembled-to-order manufacturing system with service level constraints. The manufacturer determines production and inventory levels for the components using a base stock policy, and inventory is replenished from suppliers that have stochastic lead times. Customer demands for the assembled products can...
IEEE 802.11s Mesh WLAN is a promising access network standard launched for the aim of enhancing channels' utilization, coverage extension with simple and cheap network deployment. Mesh WLAN faces challenges in power management, channel assignment, traffic forwarding, admission control, security and coexistence with other technologies. The main objective of this paper is to increase the mesh WLAN throughput...
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