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基于隐马尔科夫模型的超声波体域网差错
控制策略
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王帆
1
,杨永健
2
,李燕香
2
,刘文彬
1**
基金项目:教育部博士点基金(20120061110044)
作者简介:王帆(1989-),男,硕士研究生,主要研究方向:计算机通信体域网
通信联系人:杨永健(1960-),男,教授,主要研究方向:计算机通信无线传感器网络. E-mail: yyj@jlu.edu.cn
(1. 吉林大学软件学院,长春 130012; 5
2. 吉林大学计算机科学与技术学院,长春 130012)
摘要:体域网潜力巨大,然而使用无线电信号作为传输媒介,其潜在的辐射影响会危害人体
的健康,并不适合体域网环境。超声波作为一种对人体无害的无线信号传播手段,可以代替
无线电通信方式应用到无线体域网中。由于超声波的传播特性、能耗以及体域网络中因人体10
移动等导致的复杂信道条件等影响,导致超声波体域网络的不稳定性。本文提出基于隐马尔
科夫模型(Hidden Markov Model,HMM)的 UBANs 自适应差错控制策略,该策略利用 HMM
对误码率进行预测,再根据系统下一时间段内误码率值的大小动态选择 ARQ 或 HARQ 进行
差错控制,从而达到提高超声波体域网通信可靠性的目的。本文通过实验证明了该策略的可
行性和实用性,再通过传输成功率、能耗等指标的对比,表明其整体性能优于传统策略。 15
关键词:隐马尔科夫模型;超声波体域网;差错控制
中图分类号:TN92
Error Control Strategy in Ultrasonic Body Area Networks
Based on Hidden Markov Model 20
Wang Fan
1
, Yang Yongjian
2
, Li Yanxiang
2
, Liu Wenbin
1
(1. Department of Software, Jilin University, Changchun 130012;
2. College of Computer Science and Technology, Jilin University 130012)
Abstract: The potential of the body area network is huge, but the radio signal used as the
transmission medium is not suitable for BANs as its potential radiation effects can harm the health 25
of the human body. Ultrasonic is a kind of wireless signal transmission method, which can be used
in wireless body area network. Due to the propagation characteristics of ultrasonic, energy
consumption, and the complex channel conditions caused by the human body movement in the
body region network, the instability of the network is caused by the ultrasonic wave. In this paper,
we present an adaptive error control strategy based on Hidden Markov Model in UBANs and the 30
strategy is used to predict the rate of error according to BER and then dynamic select the ARQ and
HARQ in order to improve the reliability. The feasibility and practicability of this method are
proved by experiments. The results show that the proposed method is better than the traditional
strategy through the comparison of the transmission success rate and energy consumption.
Key words: Hidden Markov Model; Ultrasonic Body Area Networks; error control 35
0 引言
物联网的研究已成为一种新的趋势,随着物联网(Internet of Things , IoT)的发展,体
域网作为物联网的一个重要分支越来越受到广泛的关注。体域网(Body Area Network , BAN)
是无线传感器网络(Wireless Sensor Network , WSN)的一个具体实例,是由分布在人身体40
上的生理参数收集传感器、移植在人身体内的生物信息传感器以及信息处理中心共同组成的
一种无线网络。体域网有广阔的应用前景,包括远程医疗诊断、康复指导、帮老助残领域、
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