• Title/Summary/Keyword: Link Error Rate

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Delay of a Message in a Time-Varying Bluetooth Link (시변 블루투스 링크에서 메시지의 지연시간)

  • Jong, Myoung-Soon;Park, Hong-Seong
    • Journal of Industrial Technology
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    • v.23 no.A
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    • pp.41-46
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    • 2003
  • Because the quality of a radio link in real environment is generally varied with time, there is a difference between the delay in the real environment and one obtained from the analytic model where a time-varying link model is not used as a link model for a Bluetooth. This paper analyzes the transmission delay of a message in the time-varying radio link model for the Bluetooth. The time-varying radio link is modeled with a two-state Markov model. The mean transmission delay of the message is analytically obtained in terms of the arrival rate of the message, the state transition probability in the Markov model, and the packet error rate.

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Aqua-Aware: Underwater Optical Wirelesss Communication enabled Compact Sensor Node, Temperature and Pressure Monitoring for Small Moblie Platforms

  • Maaz Salman;Javad Balboli;Ramavath Prasad Naik;Wan-Young Chung;Jong-Jin Kim
    • Journal of the Institute of Convergence Signal Processing
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    • v.23 no.2
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    • pp.50-61
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    • 2022
  • This work demonstrates the design and evaluation of Aqua-Aware, a lightweight miniaturized light emitting diode (LED) based underwater compact sensor node which is used to obtain different characteristics of the underwater environment. Two optical sensor nodes have been designed, developed, and evaluated for a short and medium link range called as Aqua-Aware short range (AASR) and Aqua-Aware medium range (AAMR), respectively. The hardware and software implementation of proposed sensor node, algorithms, and trade-offs have been discussed in this paper. The underwater environment is emulated by introducing different turbulence effects such as air bubbles, waves and turbidity in a 4-m water tank. In clear water, the Aqua-Aware achieved a data rate of 0.2 Mbps at communication link up to 2-m. The Aqua-Aware was able to achieve 0.2 Mbps in a turbid water of 64 NTU in the presence of moderate water waves and air bubbles within the communication link range of 1.7-m. We have evaluated the luminous intensity, packet success rate and bit error rate performance of the proposed system obtained by varying the various medium characteristics.

An Energy Balanced Multi-Hop Routing Mechanism considering Link Error Rate in Wireless Sensor Networks (무선 센서 네트워크의 링크 에러율을 고려한 에너지소모가 균등한 멀티 홉 라우팅 기법)

  • Lee, Hyun-Seok;Heo, Jeong-Seok
    • Journal of the Korea Society of Computer and Information
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    • v.18 no.6
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    • pp.29-36
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    • 2013
  • In wireless sensor networks, energy is the most important consideration because the lifetime of the sensor node is limited by battery. Most of the existing energy efficient routing protocols use the minimum energy path to minimize energy consumption, which causes an unbalanced distribution of residual energy among nodes. As a result, the power of nodes on energy efficient paths is quickly depletes resulting in inactive. To solve these problems, a method to equalize the energy consumption of the nodes has been proposed, but do not consider the link error rate in the wireless environment. In this paper, we propose a uniform energy consumption of cluster-based multi-hop routing mechanism considering the residual energy and the link error rate. This mechanism reduces energy consumption caused by unnecessary retransmissions and distributes traffic evenly over the network because considering the link error rate. The simulation results compared to other mechanisms, the proposed mechanism is energy-efficient by reducing the number of retransmissions and activation time of all nodes involved in the network has been extended by using the energy balanced path.

Packet Performance Simulation of ACL/SCO Link in Bluetooth Piconet (블루투스 Piconet에서 ACL/SCO 링크의 패킷 성능 시뮬레이션)

  • Kim, Do-Gyun;Roh, Jae-Sung;Cho, Sung-Eon;Cho, Sung-Joon;Kim, Jung-Sun
    • Journal of Advanced Navigation Technology
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    • v.6 no.1
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    • pp.77-83
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    • 2002
  • The emergence of Bluetooth as a radio interface scheme has allowed electronic devices to be instantly interconnected as ad-hoc networks. These short range ad-hoc wireless networks are called piconets, operated in the unlicensed 2.45 GHz ISM(Industrial, Scientific, Medical) band where up to eight devices may be used to configure single or overlapping piconets. In this paper, we have simulated the PER(Packet Error Rate), the ratio of received packet and payload BER(Bit Error Rate) of piconet with packet types of Bluetooth ACL/SCO(Asynchronous Connection Less/Synchronous Connection Oriented) link over wireless ad-hoc environment. The Rayleigh fading effects are considered as channel model, and the simulation results are based on the baseband model of Bluetooth specification. From the simulation results, the PER and the throughput of Bluetooth piconet are sensibly affected by the packet type of ACL/SCO link.

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An Adaptive FEC Algorithm for Sensor Networks with High Propagation Errors (전파 오류가 높은 센서 네트워크를 위한 적응적 FEC 알고리즘)

  • 안종석
    • Journal of KIISE:Information Networking
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    • v.30 no.6
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    • pp.755-763
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    • 2003
  • To improve performance over noisy wireless channels, mobile wireless networks employ forward error correction(FEC) techniques. The performance of static FEC algorithms, however, degrades by poorly matching the overhead of their correction code to the degree of the fluctuating underlying channel error. This paper proposes an adaptive FEC technique called FECA(FEC-level Adaptation), which dynamically tunes FEC strength to the currently estimated channel error rate at the data link layer. FECA is suitable for wireless networks whose error rate is high and slowly changing compared to the round-trip time between two communicating nodes. One such example network would be a sensor network in which the average bit error rate is higher than $10^{-6}$ and the detected error rate at one time lasts a few hundred milliseconds on average. Our experiments show that FECA performs 15% in simulations with theoretically modeled wireless channels and in trace-driven simulations based on the data collected from real sensor networks better than any other static FEC algorithms.

Link selection based on switching between full-duplex and half-duplex modes

  • Kim, Sangchoon
    • ETRI Journal
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    • v.42 no.1
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    • pp.17-25
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    • 2020
  • Multiple-input multiple-output systems can achieve a full sum rate (SR) via full duplex (FD). However, its performance is degraded by self-interference (SI) that occurs between the transmitter and receiver at the same node and thus is constrained by error floors. Conversely, half duplex (HD) can avoid the SI albeit at lower spectral efficiency, and the slope of its error curve is determined by the diversity order. In this study, a link selection scheme based on switching between FD and HD is examined as a simple method to improve the bit error rate (BER) performance of FD systems. In the proposed link selection algorithm, either FD or HD is selected based on the received minimum distance and signal-to-interference plus noise ratio. Simulation results indicate that the proposed hybrid FD/HD switching system offers significant BER performance improvement when compared with that of the conventional FD and FD based on only the received minimum distance under the same fixed SR. Under relatively sufficient SI cancellation, it is demonstrated to outperform the HD with a diversity advantage in low and medium signal-to-noise ratio region.

A Study on The Performance of ATM Cell Transmission over Wireless Link (무선채널환경에서 ATM데이터의 전송성능분석 및 개선연구)

  • 이하철;이병섭
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.9 no.5
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    • pp.589-602
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    • 1998
  • While ATM technology results in considerable advantages(less overhead, increased throughput) in an optical networks, It causes severe problems(single and burst error) when ATM is transmitted over an error-prone channel, such as wireless link. In this paper we describe our investigation on ATM over wireless network. we first evaluate performance of ATM data transmission over a wireless link. Secondly we analyze performance improvements of Forward Error Correction(FEC) or ARQ(Automatic Repeat reQuest) scheme applied to wireless ATM link and provide performance comparison between FEC and ARQ through the use of packet error rate and throughput. Lastly we suggest error control architecture to overcome the impact of the bit error characteristics of a wireless link on wireless ATM network.

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Two-Level Power and Rate Allocation Scheme on the Forward Link for Multicell CDMA Data Users (멀티셀 CDMA 데이터 사용자를 위한 순방향 링크에서의 2계층 전송출력/전송률 할당체계)

  • Chang, Kun-Nyeong;Lee, Ki-Dong
    • Journal of Korean Institute of Industrial Engineers
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    • v.31 no.3
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    • pp.219-227
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    • 2005
  • In this paper, an optimal power and rate allocation model is mathematically formulated on the forward link of multicell CDMA mobile systems. The model maximizes total utility considering data rates and fairness among cells under delay and PRER (Post RPL Error Rate) constraints. The two-level power and rate allocation scheme is suggested to solve the proposed model. Experimental results show that the proposed scheme provides a good solution in a fast time.

STM-based Media Streaming for Wireless Ad Hoc Link Quality (무선 애드혹 링크 품질을 위한 STM 기반의 미디어 스트리밍)

  • Lee, Chong-Deuk
    • Journal of Advanced Navigation Technology
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    • v.17 no.3
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    • pp.285-291
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    • 2013
  • This paper proposed a new STM-based media streaming scheme to assure the wireless ad hoc link quality. The proposed scheme can assure the link quality by the stream monitoring, assurance, and update procedure, and it can be monitored the media frame by streaming time $t_{new}$. This paper minimizes the link error rate and re-transmission rate using the media streaming update based on the frame size. The simulation results show thst the proposed scheme outperforms STCP and RMST.

Design of Variable Data Transfer Rate Asymmetric TDD System Using Turbo Decoder with Double Buffer Controller (이중 버퍼 제어기 구조의 터보 복호기를 사용한 전송률 가변 비대칭 TDD 시스템 설계)

  • Park, Byeung-Kwan;Kim, Mi-Rae;Kim, Hyo-Jong
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.47 no.2
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    • pp.161-168
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    • 2019
  • This paper proposes a variable data transfer asymmetric TDD(Time Division Duplex) system for small UAV(Unmanned Aerial Vehicle) data link system. In the proposed method, a turbo decoder with a double buffer controller is proposed to apply turbo decoder with long decoding time to asymmetric TDD system. The proposed method achieves variable data transfer rate and maximum data transfer rate. The advantage of the proposed method is demonstrated by its data transfer rate. The measured data transfer rate is more than 1.8 times than that of symmetric TDD system. In addition, PER(Packet Error Rate) performance is the same and data transfer rate is variable.