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Cognitive Radio Network (CRN) is one of the emerging technologies to improve the spectrum utilization where Secondary Users (SUs) opportunistically uses the spectrum without creating significant interference to Primary Users (PUs). However, in CRN channel characteristics varies widely due to the random arrival of PUs which leads to call dropping/call blocking. Excessive call dropping reduces the quality...
This paper discusses a cost-effective technique for dynamic testing of DC-DC power supplies, based on the injection of a signal into the feedback loop of a DC-DC regulator, which makes it operating as a dynamic source or a dynamic load. The theoretical background and the practical implementation of the technique are investigated. Guidelines are provided to determine the static set-up and the bandwidth...
Although Network-on-Chips (NoCs) are fast becoming pervasive as the interconnect fabric for multicore architectures and systems-on-chips, they still suffer from excessive static and dynamic power consumption. High dynamic power consumption results from switching and storing data within routers/links while excess static power is consumed when routers and links are not utilized for communication and...
Communications systems make heavy use of FPGAs; their programmability allows system designers to keep up with emerging protocols and their high-speed transceivers enable high bandwidth designs. While FPGAs are extensively used for packet parsing, inspection and classification, they have seen less use as the switch fabric between network ports. However, recent work has proposed embedding a network-on-chip...
Energy efficient router is one of the most important and promising devices in the roadmap towards green communication and networking. In recent years, automatical power scaling adapting with real-time network traffic in a router has been proved to be practical on real hardware, which is an implementation under the traffic aware philosophy. In this paper, we further explore this direction, and present...
Data center networks leverage multiple parallel paths connecting end host pairs to offer high bisection bandwidth for cluster computing applications. However, state of the art routing protocols such as Equal Cost Multipath (ECMP) is load-oblivious due to static flow-to-link assignments. They may cause bandwidth loss due to flow collisions. Recently proposed centralized scheduling algorithm or host...
Bandwidth reconfigurable microstrip rectangular patch antenna with operating frequency (ƒc), 5.8 GHz has been presented in this paper. Network morphing method has been used to achieve reconfigurability. The bandwidth (BW) of the antenna varies from 107 MHz to 153 MHz i.e. a bandwidth variation of 46 MHz at almost constant frequency is observed. The VSWR achieved in this structure is 1.19. All this...
As the portable device market tries to enhance user experience, high-power audio systems with boosted supply voltage have been the main design focus recently. Several past works have addressed issues related to boosted supply voltages [1,2]. Nevertheless, the power stage retained the classical H-bridge structure in the previous works, which resulted in aggravated electromagnetic interference (EMI)...
In modern communication, wideband and high-spectral-efficiency modulation results in high peak-to-average power ratio (PAPR), up to 8 to 10dB. Well-known PA-efficiency-enhancement techniques, such as Doherty and outphasing, offer reduced efficiency improvement beyond 6dB back-off, limiting the efficiency enhancement obtainable with high PAPR modulation. Recent works have shown that a combination of...
Long-term-evolution (LTE) communication enables high data-rates but degrades the efficiency of the power amplifiers (PAs) due to high peak-to-average power ratios of transmitted signals. Envelope tracking (ET) and envelope-elimination-and-restoration (EER) techniques have been proposed to improve the PA efficiency by adapting the PA supply voltage to the envelope. Linear PAs in ET systems are mostly...
High-level synthesis (HLS) is getting increasing attention from both academia and industry for high-quality and high-productivity designs. However, when inferring primitive-type arrays in HLS designs into on-chip memory buffers, commercial HLS tools fail to effectively organize FPGAs' on-chip BRAM building blocks to realize high-bandwidth data communication; this often leads to suboptimal quality...
Recent years have shown an increase demand for wireless communication which creates new challenges in the field where intelligent spectrum utilization is necessary to maintain high network performance. The emergence of Cognitive Radios which provide opportunistic access to the spectrum, introduce an improvement in the spectrum utilization and the communication quality. Through dynamic spectrum access...
Software Defined Network (SDN) is an emerging networking paradigm which separates the control plane from the data forwarding plane. The centralized controller provides the global view of the distributed network states for user applications. However, the scalability of SDN is subject to the delay, the capacity of the controller, the bandwidth of the control channel, and other issues. To solve this...
Data centers play an important role with the fast growth of cloud computing used in our daily life. Traditional data center networks based on the fat-tree topology have their own drawbacks and limitations which prevent them from providing high performance to satisfy the increasing demand for cloud services. In this paper, we first design a new flexible network fabric for data center networks based...
Metamaterial transmission lines are considered as applied to design of advanced microwave devices with improved performance and enhanced functionality. Design examples of different microwave devices using the left-handed transmission lines are presented to demonstrate advantages in miniaturization, bandwidth broadening, and dual-band operation.
Device-to-device transmission technology can help base stations achieve high transmission rates and meet high-capacity requirements. It is also a key technology for future markets. Additionally, the coexistence of licensed and unlicensed bands will be relevant to the landscape of the emerging 5th-generation cellular systems. However, there is a shortage of research on efficient transmission during...
Software-Defined Networking (SDN) provides an abstraction of the network that allows network administrators to configure network devices seamlessly across the enterprise networks. Although SDN has created a new paradigm in next generation network, centralized controller architecture in SDN imposes overhead issue because control plane will handle all flows regardless of size and priority. Besides that,...
Network Virtualization allows multiple tenants share physical network resources flexibly. As a newly emerging architecture, Software-defined network (SDN) decouples the control plane and data plane, realizes the efficient control of network traffic. The emergence of SDN provides network virtualization a new solution for virtual network deployment. One of the most challenging issues, called Virtual...
Recent research has shown that the integration of a custom-silicon network-on-chip (NoC) into an FPGA fabric can significantly help on-chip communication bandwidth. Although not appropriate for all communication, FPGA hard NoCs provide a scalable infrastructure that will increase in importance as FPGA sizes increase. To date, most FPGA hard NoC implementation has focused on packet-switched routing...
RAM-based storage aggregates the RAM of thousands of commodity servers in data center networks (DCN) to provide extremely low I/O latency and high I/O throughput. In order to achieve fast failure recovery, MemCube exploits network proximity to restrict failure detection and recovery within 1-hop range. However, previous design is applicable only to the BCube network, which limits the usage of RAM-based...
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