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The objective of this study is to propose a compact and highly accurate fiber line monitoring system for inspection in optical communications. We developed the handheld line information reader and generator. The developed line information reader consists of a micro controller unit, communication module, display panel, photo diode, transimpedance amplifier, and a voltage amplifier. The line information...
This paper proposes a near-field magnetic multiple input multiple output (MIMO) scalable non-coupling coil array for achieving high-rate data transmission for implantable devices. While small path loss of near-field magnetic communication enables effective implementation of implantable devices, it is difficult to support high-rate applications. In this regard, many of previous works attempted to overcome...
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...
Polar coding is a low-complexity method for communication over noisy classical channels, which is capable of providing highly reliable data transmission. This paper proposes an enhanced polar codec scheme for mission critical applications in train-to-ground wireless communications. Firstly, we develop an enhanced polar coding scheme to support reliable data transmission under time-varying channel...
Due to climate change and its impact on agriculture, accurate estimate of future crops yield is very critical for low-lying countries like Bangladesh. Rice is the most consumed crop for Bangladesh with an annual production of more than 40 million tons per year. Despite being gifted with multiple seasons suitable for cultivating variety of rice, its productivity in Bangladesh has been changing following...
With the development of algorithms and computer skills, deep learning using CNN (convolutional neural network) has been applied to various fields, especially in image processing field. In this paper, we designed an improved model based on ResNet with CNN structure, and learned the database. The Chaucer Database used in the experiment consisted of 824 Chinese characters among the Chinese characters...
This paper studies appropriate values of EDCA parameters of the author's wireless LAN base station based on Quality of Experience (QoE) for Web Services by experiments with subjects. The base station reduces the traffic of a Web service without degradation of QoE; it utilizes EDCA as QoS control. However, appropriate EDCA parameter value have never been studied. This paper evaluates QoE and measures...
As the conventional QAM has a square constellation, PAPR is high due to the corner signal points. To overcome this, the (3 × 2m)-ary QAM with even m was proposed recently. For odd m, the rectangular constellation has high PAPR and perfect Gray code, while the diamond constellation has low PAPR and imperfect Gray code. In this paper, we propose a scheme assigning quasi-Gray code to the diamond constellation...
Intelligent Transportation System (ITS) is the emerging transportation which comprises of the advanced technologies such as wireless communications, video vehicle detection, distributed system architectures, human machine interface, sensing and actuating, to improve safety of the passengers, traffic congestion, fuel consumption and optimize other services of the transportation system such as real...
This paper proposes a blind interleaver period estimation algorithm by sorting error-less symbols. After finding the error-less symbols through the rank distribution of the square matrices, we construct a rectangular matrix by locating errorless symbols on the top of a matrix. By analyzing this matrix, we can estimate the interleaver period. Experimental results show that the proposed algorithm has...
The explosive growth of wireless devices requires more aggressive and balanced spectrum sharing and the listen-before-talk (LBT) is still a superior candidate protocol for a high device density. The Modified hardcore point process (HCPP) type II model provides mathematically tractable performances for such LBT networks, but it underestimates the LBT performances. In this regard, this paper evaluates...
In our paper, a novel method is proposed to obtain the optimal positions of secondary base stations (SBSs) for cognitive radio Internet of Things (IoT) sensor networks and to select the optimal operating channel in order to maximize the secondary capacity, while also protecting the primary systems. We proposed an appearance probability matrix for secondary IoT sensor devices in order to maximize the...
Adaptive borrow-repay resource allocation uses the positioning information when temporal communication disconnection is expected. It borrow the required bandwidth and repay later. Obstructions such as tunnels or buildings between satellite terminals and satellites may temporarily disconnect the satellite communication and result in the performance degradation of TCP. In this paper, we propose the...
This paper deals with the influence of IDT (interdigitated transducer) structure and input signal on responses of passive wireless sensor SAW (Surface Acoustic Wave). We used simulation software based on finite element method (FEM) with YZ-LiNbO3 piezoelectric substation has 80 μm thickness, 3 reflectors, material of the reflecting bar is Al and the structure of IDT is SPUDT (single-phase unidirectional...
Quantum key distribution (QKD) enables two authenticated parties to share secret keys with the ability to detect any attempts to eavesdrop the keys theoretically. Currently, QKD systems can be categorized by its source of uncertainty in nature; single photon or coherent light. As coherent light is harnessed, the overall cost for composing systems drops in general. However, more elaborate post processing...
In this paper, we investigate the state of the art for the deployment of ECN (Explicit Congestion Notification) on the Internet from a different viewpoint. We carefully choose four data sets as the hosts to be tested. We negotiate an ECN-Capable and a Not-ECN-Capable connections with each host and collect all packets belonging to the connections. By analyzing the TCP/IP header fields of packets belong...
When a standard TCP implementation using the minimum retransmission timeout (RTOmin) of 200 ms is used in distributed file systems in data centers, a well-known throughput degradation called TCP Incast occurs, because 200 ms is too large as an RTOmin in data centers. In order to avoid TCP Incast, a TCP implementation using a much smaller RTOmin attained by a fine-grained kernel timer is proposed....
A flying ad hoc network (FANET) that consists of multiple unmanned aerial vehicles (UAVs) is a promising technology for future networked systems. In this paper, we study a way to construct a topology for the FANET that guarantees end-to-end communication between the ground control station (GCS) and each mission UAV that performs its given task via optimizing the locations of the relay UAVs. To this...
It becomes clear that climate changes increase the frequency and intensity of natural disasters, which may disrupt the normal operation of electrical facilities. In order to investigate the relationship between the climate changes and electrical facilities, it is necessary to assess the risk for climate changes in terms of major types of climate change hazards. From that purpose, a spider web chart...
With the development of ICT (Information and Communication Technology), computer and the Internet have become indispensable for people's social activities while cyber security threats keep on increase trend. Unfortunately, the current popular security facilities cannot efficiently detect cyber attacks due to a tremendous amount of network traffic needs to be analyzed. In this paper, we focus on DNS...
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