A 2Mbps Human Body Communication Transceiver Based on Body Antenna Effect

This paper presents a human body communication(HBC)transceiver for wireless body network applications.The transceiver employs on frequency shift keying(FSK)modulation and op-erates in 40 MHz-60 MHz which is the resonant frequency of the human body as an antenna.It achieves high performance and stability through establish passive microstrip line and via models and active device-models.The proposed transceiver is designed and fabricated by FR4 printed cir-cuit board(PCB)process,the transceiver has the ability of configurable data rate up to 2 Mbps and it achieves-86 dBm receiving sensitivity at 2 Mbps data rate.Meanwhile,the transceiver out-put power dynamics range is 34 dB.Furthermore,with a visual interaction interface,the transceiv-er can be agility use in a variety of scenarios.Its measurements are verified on human body.The result shows that the transceiver has ability to send data from person to person by relying on hu-man body antenna radiation.The transceiver shows great prospect in wireless body area networks(WBAN)for telemedicine and emergency communication.

A Novel Flexible Antenna at Very High Frequency Band for On-Body Applications

This paper proposes a novel flexible antenna design operating at very high frequency(VHF)band for on-body applications such as human body communication(HBC).The antenna consists of back-to-back E-shaped fractal and complimentary structures designed over a thin flex-ible substrate.The overall design working on the principle of fractal geometries and capacitive coupling is highly beneficial to achieve better antenna characteristics even at low frequencies around 35 MHz-45 MHz that are being used for HBC application.The proposed antenna obtained a large bandwidth of around 10.0 MHz in air and a bandwidth of around 8.0 MHz during on-body opera-tion.The antenna has been tested in three different scenarios viz.air,on-body single antenna and on-body communication using two antennas.The insertion loss is reduced to a minimum in all three scenarios,which is quite beneficial for better signal transmission.The size miniaturization with high flexibility in such low frequencies has also been achieved in the paper that makes the proposed design suitable for human body communication applications.

无线通信频段上人体的穿透损耗测量

本文选取了750 MHz～5.8 GHz频段上无线通信的常用频点,测量了人体、木门和墙体造成的电波穿透损耗。测量结果表明,人体造成的穿透损耗从5.8 dB～20 dB不等,这是是值得注意的。在实验中人体的遮挡面积是远小于墙面的,也小于木门,但是却获得了接近的穿透损耗。

狭长空间基于人体穿透损耗模型的组合定位方法

狭长空间定位问题普遍存在于室内定位应用场景中,虽然传统基于RSSI（Received Signal Strength Indicator）测距的定位方法简便易行,但是狭长空间RSS的波动性以及人体对无线信号的遮挡会严重降低人员定位精度。本文在分析了人体穿透损耗对狭长空间定位影响的基础上,提出将RSSI测距与扩展卡尔曼滤波定位算法组合实现定位,即在中等尺度（5λ-50λ）内采用基于人体穿透损耗模型的RSSI测距方法定位,在大尺度（〉50λ）内采用基于人体遮挡修正模型的扩展卡尔曼滤波算法定位。实验表明该方法在狭长空间的定位精度明显优于RSSI测距定位方法。

室内X波段离体信道传播特性的测量与建模

研究了在X波段以人体为中心环境的无线信道衰落模型建模方法,围绕可穿戴天线在体表不同部位的无线信道进行了实验和分析.分别在离体与无体场景下测量视距(line-of-sight,LoS)和非视距(non-lineof-sight,NLoS)两种路径的信道衰落,对比分析人体不同部位的阴影效应和穿透损耗,结果表明改变天线穿戴部位,信道衰落曲线的损耗指数和截距均会发生变化;人体穿透损耗与信道频率、收发端天线之间的距离无关.基于现有的模型对实验数据进行拟合,提出一种与人体不同部位相关的带有体表阴影效应、穿透损耗修正因子的离体信道衰落模型.该模型细化了人体不同部位的信道特性,与通用模型相比能更加精地确描述离体信道传播环境.