• Title, Summary, Keyword: wireless communication method

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Improved Compressed Network Coding Scheme for Energy-Efficient Data Communication in Wireless Sensor Networks

  • Zhou, Ying;Yang, Lihua;Yang, Longxiang
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.11 no.6
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    • pp.2946-2962
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    • 2017
  • An improved energy-efficient compressed network coding method is proposed for the data communication in the wireless sensor networks (WSNs). In the method, the compressed sensing and network coding are jointly used to improve the energy efficiency, and the two-hop neighbor information is employed to choose the next hop to further reduce the number of the transmissions. Moreover, a new packet format is designed to facilitate the intermediate node selection. To theoretically verify the efficiency of the proposed method, the expressions for the number of the transmissions and receptions are derived. Simulation results show that, the proposed method has higher energy efficiency compared with the available schemes, and it only requires a few packets to reconstruct measurements with reasonable quality.

Coexistence of OFDM-Based IMT-Advanced and FM Broadcasting Systems

  • Shamsan, Zaid A.;Rahman, Tharek A.;Kamarudin, Muhammad R.;Al-Hetar, Abdulaziz M.;Jo, Han-Shin
    • ETRI Journal
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    • v.33 no.2
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    • pp.279-282
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    • 2011
  • Coexistence analysis is extremely important in examining the possibility for spectrum sharing between orthogonal frequency-division multiplexing (OFDM)-based international mobile telecommunications (IMT)-Advanced and other wireless services. In this letter, a new closed form method is derived based on power spectral density analysis in order to analyze the coexistence of OFDM-based IMT-Advanced systems and broadcasting frequency modulation (FM) systems. The proposed method evaluates more exact interference power of IMT-Advanced systems in FM broadcasting systems than the advanced minimum coupling loss (A-MCL) method. Numerical results show that the interference power is 1.3 dB and 3 dB less than that obtained using the A-MCL method at cochannel and adjacent channel, respectively. This reduces the minimum separation distance between the two systems, which eventually saves spectrum resources.

A Investment on Wire-wireless Communication Method for Electrical Device Infrastructure Maintenance (전력설비 관리를 위한 무선 및 유선 통신 방법에 관한 고찰)

  • Kim, Young-Eok;Lee, Jin
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.2
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    • pp.354-359
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    • 2016
  • Power plants maintenance data is to be sent to management server system via a communication network. In this case, reliable communication network is required. Transmission of the power plants maintenance data is used in the wired communication network or wireless communication network. PLC communication network is a kind of wired communication network. However PLC communication network is easily affected by noise. On the vulnerable areas in power line system, such as a mountain or rural areas, it is difficult to form a power line communication network. For a wireless communication, environment are also influenced factors in wireless communication. Harsh environmental factors are bring the communication characteristic degradation. In such areas it can be used a combination of two networks and in this way the complementary function can be achieved. Power plants are distributed in various regions across the country. The appropriate communication network is needed to maintain the power plant.This study investigated the effect of environment on the wired communication and wireless communication. It would examine a variable factor which is affect to the communication characteristic. We used PLC communication for wired communication network and ZigBee communication for wireless communication network. We investigated the characteristics of a single communication network and it raised the need for a complex communication technology to complement a single communication network.

Multi-agent Q-learning based Admission Control Mechanism in Heterogeneous Wireless Networks for Multiple Services

  • Chen, Jiamei;Xu, Yubin;Ma, Lin;Wang, Yao
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.7 no.10
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    • pp.2376-2394
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    • 2013
  • In order to ensure both of the whole system capacity and users QoS requirements in heterogeneous wireless networks, admission control mechanism should be well designed. In this paper, Multi-agent Q-learning based Admission Control Mechanism (MQACM) is proposed to handle new and handoff call access problems appropriately. MQACM obtains the optimal decision policy by using an improved form of single-agent Q-learning method, Multi-agent Q-learning (MQ) method. MQ method is creatively introduced to solve the admission control problem in heterogeneous wireless networks in this paper. In addition, different priorities are allocated to multiple services aiming to make MQACM perform even well in congested network scenarios. It can be observed from both analysis and simulation results that our proposed method not only outperforms existing schemes with enhanced call blocking probability and handoff dropping probability performance, but also has better network universality and stability than other schemes.

A Cooperative Navigation for UAVs with Inertial Sensors and Passive Sensor Using Wireless Communication (무선통신을 이용한 관성센서 및 수동센서 장착 무인기들의 협력 항법)

  • Seong, Sang Man
    • Journal of Institute of Control, Robotics and Systems
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    • v.19 no.2
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    • pp.102-106
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    • 2013
  • A cooperative navigation method for cooperative flight of UAVs is proposed. The commonly used navigation method for UAVs is based on GNSS measurements. However, when it is not available by jamming or other causes, an alternative method is needed. In this paper, it is shown that UAVs equipped with inertial sensors, passive sensor and wireless communication link can perform accurate navigation through sharing information with each other. Firstly, the appropriate roles for sensors and wireless communication link are assigned. Secondly, a filter to perform navigation cooperative is constructed. Finally, the boundedness of estimation error of the filter under small initial estimation error is analyzed. The simulation results show that the proposed method can reduce navigation errors effectively.

A Study on WiBro Application to Telematics Wireless Communications Network (휴대인터넷의 텔레매틱스 무선통신 방식으로의 활용 방안)

  • Oh, Kil-Nam;Kim, Bong-Soo;Choi, Wan-Sik
    • Proceedings of the KIEE Conference
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    • pp.276-278
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    • 2005
  • This paper introduces the testbed configuration for telematics wireless communications using WiBro network, one of the next generation wireless communication networks. We review the architecture and core technology of WiBro network, and investigate WiBro based telematics services, WiBro testbed configuration, and function verification and test method for WiBro wireless communication access module.

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Evaluation Method for Communication Distance Measurement Method for Mobility Characteristics of Service Robot in Wi-Fi Network Based (Wi-Fi 네트워크 기반에서 서비스 로봇의 이동특성을 위한 통신거리 성능평가 방법)

  • Min, Sun-Ho;Seo, Chang-Ho;Hong, Do-Won
    • Journal of Digital Convergence
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    • v.10 no.3
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    • pp.265-271
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    • 2012
  • This paper proposes a communication distance performance evaluation method for mobility of service robots equipped with a Wi-Fi module. Service robots have function of mobile communication system according to classified services and utilize a (preferred) communication method, wireless lan(IEEE802.11 a/b/gin) communication method of ISM band(2.4GHz and 5.8GHz). For evaluating degradation performance of wireless data for the service robot's mobility. We measured and presented reference vectors obtained by utilizing a distance attenuation correlation method in the real world environment. To evaluate performance of the proposed method, path loss of reference vectors was assigned to the Azimuth 301W and then transmission rate and the transmit throughput of the test sample were measured by the Chariot. The proposed measurement method is necessary for securing wireless LAN communication distance for mobility of mobile smart device and service robots. In addition, if the proposed measurement method os adopted, It would be expected that mobile smart device vendors would utilize the method as an effective wireless LAN mobility communication distance performance evaluation method.

A Study on the Multi-wireless Communication Using Cnet Protocol for PLC (Cnet 프로토콜을 이용한 PLC간의 다중무선통신에 관한 연구)

  • Rhyu Keel-Soo;Lee Hoo-Rach;Chung Kyung-Yul
    • Journal of the Korean Society of Marine Engineering
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    • v.29 no.4
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    • pp.384-390
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    • 2005
  • This paper addresses the design and implementation of a wireless network. proposed as a cost-effective support platform for PLCs. With this network. one or more supervising stations may access remote equipment like PLCs. An applicable communication methods are described and we applied efficient method among them to PLCs communication. The paper specifies these requirements and indicates methods to fulfill them. Also. it provides to the model of operation, and focuses on the implementation approach. The hardware and software design is described together with a number of critical points related to wireless communication on the Cnet. Furthermore, a discussion on system expandability and performance is tackled and some observations are stated. The main conclusion is, that the proposed method can feature good performance under normal operating conditions.

Study on the Design Method of the Energy Harvesting Smart Sensor for Implementing IoT Service (IoT 서비스 구현을 위한 에너지 하베스팅 Smart Sensor 설계 방안 연구)

  • Jang, Ho-Deok
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.11 no.1
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    • pp.89-94
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    • 2018
  • This paper investigated the design method of the smart sensor for implementing IoT (Internet of Things) service. The power supply of sensor consistently acquisting data is based on the energy harvesting technology and designed with piezoelectric transducer not affected by surrounding circumstances. The wireless communication interface for the transmission of data is designed with BLE (Bluetooth Low Energy). BLE is highly adequate wireless communication technology for low power consumption and short distance wireless communication. The main application of BLE is beacon whose usage range is extended from O2O (Online to Offline) service, navigator based on indoor positioning technology, and anti-theft/lost child prevention service to mobile game. This paper studied the method to extend wireless coverage for complementing the short wireless transmission distance of BLE. The wireless sensor network based on CATV network is proposed for the easy construction of BLE sensor network and extended wireless coverage.

Using leak coaxial cable, a wireless communications network plan in high-rise buildings (기술사마당: 기술자료 -초고층(超高層) 건물(建物) 내(內)에서 누설동축케이블을 이용한 무선통신(無線通信)네트워크 구축(構築) 방안-)

  • Lee, Soon-Jong;Lee, Moon-Ho
    • Journal of the Korean Professional Engineers Association
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    • v.44 no.5
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    • pp.42-47
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    • 2011
  • Currently, wireless communication environment in high-rise buildings are limited in the basement and ground floor facilities are not in common use do not part, in case of disaster is difficult for efficient repression. In this paper, wireless communication facilities on the ground floor of the skyscraper by building infrastructure, wireless communications is proposed to eliminate shadows. That the presence of various wireless communication systems, wireless communication system proposed by this paper, TPS laying coaxial cable seals leak, and the propagation shades in place by installing indoor antenna is the solution to eliminate shadows. The wireless communications solutions reveal the advantages and features, a method of constructing the proposed design.

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