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This paper provides a thorough analysis of the key aspects affecting the capacity of LTE networks. We group the analysis to the three major categories namely technology, spectrum and topology aspects. Through the extensive system-level simulations we investigate which of the specified aspects mostly affect the capacity and spectrum efficiency of 4G LTE networks. In addition, based on the performed...
Demand for ad-hoc networks is increasing so it is expected ad-hoc networks will exist in close proximity in the future. A contention window control method, ACWA, which improves throughput of ad-hoc network against radio interference has been recently proposed. However unfairness of throughput between ACWA and DCF might be caused. We propose a modified ACWA method (GSAR scheme) which drastically improves...
The decode-and-forward (DF) relay based cellular network is considered an efficient technique for solving the coverage and improving system capacity of the current fourth-generation (4G) and the emerging fifth-generation (5G) mobile telecommunication technologies. In this analysis, we control the codeword's transmission parameters by achieving a good trade-off between setting more resources with changing...
Cognitive radio (CR) is an effective way to improve the utilization of spectrum resource. This paper focuses on the resource allocation in cooperative relay cognitive radio networks and proposes an optimized resource allocation algorithm. In the algorithm, when the channel between the primary source and destination is good, the primary user (PU) selects a best sub-channel to transmit its data directly,...
Dynamic spectrum access (DSA) paradigm has shown significant potential to improve the electromagnetic spectrum utilization. For DSA in the multi-user decentralized networks, frequency band characterization and allocation among unlicensed users is a non-trivial task and various decision making policies (DMPs) have been proposed recently. Though auction based DMPs have shown to offer better performance...
The keypoints detection, matching and tracking based online tracking algorithm, which is called CMT (Clustering of the Static-Adaptive Correspondences for Deformable Object Tracking), is robust and accurate for deformable object tacking. However, its optical flow tracker is error-prone when active points run outside the scope of the target. Worse still, the computational complexity of CMT greatly...
The fifth-generation (5G) mobile communication system has attracted much attention to provide various kinds of mobile services and applications for 2020 and later. 28 GHz band is one of the most potent bands for 5G since super wide bandwidth of almost 1 GHz will be available. In the high frequency band, beamforming is mandatory to compensate large path loss. Hence beam tracking mechanism is important...
The index coding problem has been generalized recently to accommodate receivers which demand functions of messages and which possess functions of messages. The connections between index coding and matroid theory have been well studied in the recent past. Index coding solutions were first connected to multi linear representation of matroids. For vector linear index codes discrete polymatroids which...
This paper constructs a competiveness evaluation system of port with resource competitiveness, structure competitiveness, and transformation and upgrading competitiveness, from which we can learn core competitiveness of each port area specifically. Matter-element model is used to evaluate their competitiveness, through which we can not only figure out the competitiveness, but also trace back to the...
Text analytics has become increasingly important in the past few years because of the substantial growth in the amount of research, business, and government needs. An efficient text analytics system is likely to require high-powered regular expression matching (REGEX), as REGEX operations dominate the whole execution time. Some approaches have exploited the parallelism of graphic processing units...
This paper focuses on resource allocation in heterogeneous Ultra Dense small-cell Networks (UDNs), in which massive overlaid small cells are under the coverage of a macro cell. In UDN, both co-tier and cross-tier interference need to be taken into account. When increasing the deployment density of Small-cell Base Stations (SBSs) and the unreasonable energy usage, it results in serious interference...
Validated by Mote Carlo simulations, a 2D-Markov chain model is proposed for analyzing the throughput of a simplified LTE system. User scheduling strategy for maximizing the sum throughput in a heterogeneous network consisting of LTE and WiFi systems is obtained using the proposed LTE's 2D-Markov chain model and a previously developed WiFi's 2D-Markov chain model.
Deadlock avoidance mechanisms for lossless lowdistance networks typically increase the order of virtual channel (VC) index with each hop. This restricts the number of buffer resources depending on the routing mechanism and limits performance due to an inefficient use. Dynamic buffer organizations increase implementation complexity and only provide small gains in this context because a significant...
HopsFS is an open-source, next generation distribution of the Apache Hadoop Distributed File System(HDFS) that replaces the main scalability bottleneck in HDFS, single node in-memory metadata service, with a no-sharedstate distributed system built on a NewSQL database. By removing the metadata bottleneck in Apache HDFS, HopsFS enables significantly larger cluster sizes, more than an order of magnitude...
In this paper, we investigate the performances of schedulers, which basically allocate the resources to multiple users based on different algorithms, in multiple-input multiple-output (MIMO) and orthogonal frequency division multiple access (OFDMA) based cellular wireless networks. In addition to conventional OFDMA resources which are time and frequency, antennas are also considered as resource during...
Abstract-In the present paper we demonstrate the novel technique to apply the recently proposed approach of In-Place Appends - overwrites on Flash without a prior erase operation. IPA can be applied selectively: only to DB-objects that have frequent and relatively small updates. To do so we couple IPA to the concept of NoFTL regions, allowing the DBA to place update-intensive DB-objects into special...
In this paper, we evaluate the performance of two WMN architectures considering throughput, delay and fairness index metrics. For simulations, we used ns-3. We compare the performance for two architectures considering different transmission rates and OLSR protocol. The simulation results show that for 100 [kbps] transmission rate, the throughput of Hybrid WMN is higher than I/B WMN. But, for transmission...
The literature review shows a trend to arbitrary number of multi-field packet classification is evolved from standard 5-tuple matching to support new applications like OpenFlow switch which processes upto 15 fields [1]. However, arbitrary number of multi-field packet classification becomes a great challenge regarding to performance, memory requirement, and update cost. In this paper, a high performance...
Network Functions Virtualization (NFV) is a technology for running software-based functions on commodity hardware, which can lead to cost savings and flexible functionality. However, due to the software processing of network functions, the performance of Virtualized Network Functions (VNFs) is considerably degraded in relation to the types of VNFs and the configuration of VNF applications. Therefore,...
Modern reconfigurable computing chips, such as FPGAs, offer an unprecedented opportunity to achieving both multifunctionality and real-time responsiveness for memoryintensive embedded applications. However, how to cost-effectively synthesize application-specific hardware constructs that fully exploit memory-level parallelism remains to be a key challenge. To address this problem, we propose a new...
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