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Auto white balancing is the process of keeping the color of objects constant automatically under different illumination conditions by calculating a number of parameters from the image data. These parameters are used to change the image pixel values to keep the color constant. This paper discusses the Lam's auto white balance algorithm and presents a novel, high-performance and cost-effective implementation...
Along with the development of high-speed railway, higher and higher technical requirements for the mobile communication system in it are raised. Communication Based Train Control (CBTC) will be based on mobile communication, of which the key problem is how to support high reliability of data transmission in order to improve utilization of tracks and enhance train's safety. The applications of LDPC...
QoS prediction is critical to Web service selection and recommendation. This paper proposes a collaborative approach to quality-of-service (QoS) prediction of web services on unbalanced data distribution by utilizing the past usage history of service users. It avoids expensive and time-consuming web service invocations. There existed several methods which search top-k similar users or services in...
Leveraging on recent TV white space communications developments in regulations,standards initiatives and technology, this paper considers a suitable next generation network comprising of two primary users (PUs) that compete to offer a service to a group of secondary users (SUs) in the form of mesh routers that belong to different entrepreneurs participating in a non-cooperative TV white space trading...
Energy harvesting (EH) technology has become a promising alternative to solve the problem of the energy-limited wireless systems. As such, in this paper, we consider optimization of a single-user wireless communication system, where an EH transmitter operates in harvest-use-store (HUS) mode with the non-ideal rechargeable battery. With the storage efficiency and causality constraints, our key design...
The choice of relay nodes significantly affects the performance of wireless cooperative networks. Previous research mostly focused on dedicating one relay node to a source node in the network. However, fairness can be improved by sharing each relay node among more than one source node. This paper first defines the shared relay assignment for (max-min) fairness (SRAF) problem, and formalizes it using...
We propose a new framework for optimizing the target secrecy rate for SISOME wiretap channels when the instantaneous capacity of the eavesdropper's channel is not available at the transmitter. In our framework we introduce the effective secrecy throughput, a new optimization metric that implicitly captures the two key features of wiretap channels, namely, reliability and secrecy. We derive target...
IEEE 802.15.4 Medium Access Control (MAC) layer does not include the Request-To-Send/Clear-To-Send (RTS/CTS) handshake mechanism, in order to overcome the hidden node problem that affects Wireless Sensor Networks (WSNs). In this paper we propose and analyse the use of RTS/CTS in IEEE 802.15.4 for the nonbeacon-enable mode. The proposed solution shows that by considering the RTS/CTS mechanism combined...
In this paper, we present a transformation that takes a cyclo-static dataflow (CSDF) graph and produces an equivalent multi-rate synchronous dataflow (MRSDF) graph. This fills a gap in existing analysis techniques for synchronous dataflow graphs, transformations into equivalent homogeneous synchronous dataflow (HSDF) graphs exist, but these suffer from an exponential increase in the graph's size....
Mobile traffic demand varies significantly in time and space. Hence, wireless radio resources in hotspot areas and at peak traffic hours may be scarce. Consequently, special attention has to be paid to effects induced by admission control, i. e., blocking of data requests by base stations in case of high utilization or overload. Moreover, rising traffic demand requires denser deployments and frequency...
In 3GPP Long Term Evolution (LTE) Heterogeneous Network (HetNet), the macro Base Station and the pico Base Station (BS) have very different transmit powers. So the traditional cell selection makes some users connected to a macro BS although they are geographically closer to a pico BS. These users would create severe uplink (UL) interference in HetNet. Range Expansion (RE) technique is one saving grace...
Small cells have been identified as an effective solution for coping with the important traffic increase that is expected in the coming years. But this solution is accompanied by additional interference that needs to be mitigated. The enhanced Inter Cell Interference Coordination (eICIC) feature has been introduced to address the interference problem. eICIC involves two parameters which need to be...
Wireless Sensor Networks (WSNs) provide a cost efficient solution for data gathering in future smart environments like smart grids and Advanced Metering Infrastructure (AMI). Using the traditional minimum cost routing, leads to congestions along shortest paths and decreases the network lifetime. Multipath routing and load balancing is a logical way to extend the network lifetime. In this paper we...
Cognitive radio (CR) technique is considered an effective mechanism to relieve the spectrum scarcity issue, where the secondary users (SUs) can utilize the idle spectrum of the primary users (PUs). How the performance of the wireless network will be influenced by the introduction of CR technique has been attracting much attention in past years. While many efforts have been made to study the cognitive...
Cloud computing aims at providing services on the basis of a shared pool of underpinning resources and load balancing is of paramount importance in such an environment. At the same time, multi-tenancy is widely adopted in cloud computing to reduce the costs of service provisioning and to improve resource utilization. Multi-tenancy brings new challenges to load balancing, since it incurs resource competition...
Emerging multimedia services are spreading significantly thanks to the availability of high speed wireless networks. Network operators are facing the challenges to accommodate these services (e.g. Skype, interactive gaming, and other multimedia applications) with high user satisfaction. This paper presents a Quality of Experience (QoE) driven approach to allocate the radio resources in Long Term Evolution...
We propose a novel approach to the computation of the CRC functions, commonly used for bit error checking purposes when handling binary data. This approach is designed for general hashing purposes in FPGA, for which the CRCs are usable as well. The method is suitable for applications which use parallel inputs of fixed size and require high throughput, such as hash tables. We employ the DSP blocks...
A computer network is basically the combination of computers and different type of devices that are interfaced by a range of resources i.e. communications channels that provide the communications between users and allow them ability of sharing the resources. Multicasting is used to send the information from one receiver to group of receivers. But it is faced big issue because of additional data demand...
This paper proposes a new dynamic strategy for selecting the optimal cluster head in Stable Election Protocol (SEP). The proposed strategy selects a node as cluster head if it has the maximum energy among all the available nodes in that particular cluster. The maximum energy is that which is calculated at running time of the WSN. The proposed strategy considers heterogeneous nodes and divides nodes...
Realization of modern general purpose processors and DSP processors, Fused multiply adder is very attractive approach for multiply and accumulate instructions. But in various applications like FFT's and others dsp applications have instructions like AB+CD. Hence two term dot product unit is preferred approach for high performance of the processors. Dot product unit multiplies two set of floating point...
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