scholarly journals Wireless Body Sensor Communication Systems Based on UWB and IBC Technologies: State-of-the-Art and Open Challenges

Sensors ◽  
2020 ◽  
Vol 20 (12) ◽  
pp. 3587
Author(s):  
Ivana Čuljak ◽  
Željka Lučev Vasić ◽  
Hrvoje Mihaldinec ◽  
Hrvoje Džapo
Keyword(s):  
Communication Systems ◽  
Short Range ◽  
Ieee 802.15.4 ◽  
State Of The Art ◽  
Low Cost ◽  
Ultra Wideband ◽  
Body Area ◽  
The Subject ◽  
Wireless Interfaces ◽  
User Friendly

In recent years there has been an increasing need for miniature, low-cost, commercially accessible, and user-friendly sensor solutions for wireless body area networks (WBAN), which has led to the adoption of new physical communication interfaces providing distinctive advantages over traditional wireless technologies. Ultra-wideband (UWB) and intrabody communication (IBC) have been the subject of intensive research in recent years due to their promising characteristics as means for short-range, low-power, and low-data-rate wireless interfaces for interconnection of various sensors and devices placed on, inside, or in the close vicinity of the human body. The need for safe and standardized solutions has resulted in the development of two relevant standards, IEEE 802.15.4 (for UWB) and IEEE 802.15.6 (for UWB and IBC), respectively. This paper presents an in-depth overview of recent studies and advances in the field of application of UWB and IBC technologies for wireless body sensor communication systems.

A Hybrid Deterministic-Stochastic Propagation Model for Short-Range MIMO-UWB Communication Systems

Frequenz ◽  
2012 ◽  
Vol 66 (7-8) ◽  
Author(s):  
Malgorzata Janson ◽  
Juan Pontes ◽  
Thomas Fügen ◽  
Thomas Zwick
Keyword(s):  
Ray Tracing ◽  
Communication Systems ◽  
Short Range ◽  
Direction Selectivity ◽  
Propagation Model ◽  
Ultra Wideband ◽  
Frequency Range ◽  
Channel Characteristics ◽  
Proposed Model ◽  
Ray Tracing Model

AbstractThis paper presents a computationally effective approach for including dense multipath components in ray tracing simulations of ultra wideband (UWB) channels. Through a combination of a standard ray tracing model with a simple geometric-stochastic model realistic scenario-specific simulations are possible. The frequency and direction selectivity of the channel are reproduced accurately by the model. The structure and parameters of the stochastic part of the model are derived from measurements in the FCC-UWB frequency range. Compared to conventional ray tracing simulations the proposed model reduces considerably the differences between simulated and measured channel characteristics.

FM-CW compact reflectometer using DDS signal generation

2021 ◽  
Vol 16 (11) ◽  
pp. C11005
Author(s):  
A. Silva ◽  
J. Dias ◽  
J. Santos ◽  
F. da Silva ◽  
B. Gonçalves
Keyword(s):  
Integrated Circuits ◽  
Communication Systems ◽  
Low Cost ◽  
Ultra Wideband ◽  
Signal Generation ◽  
Single Chip ◽  
Constant Frequency ◽  
Band Frequency ◽  
Full Band ◽  
External Clock

Abstract A prototype of a compact coherent fast frequency sweeping RF back-end is being developed at IPFN-IST using commercial Monolithic Microwave Integrated Circuits (MMIC). On this work we present the usability of this concept of compact reflectometry associated with a Direct Digital Synthesis (DDS) source. Flexibility is one of the design goals for the back-end prototype, so that it can easily match the required frequency range. The backend alone covers the NATO J-band (10 GHz to 20 GHz) and is designed to drive external full band frequency multipliers, resulting in an ultra-wideband coverage of up to 140 GHz. FM-CW radar precision is strongly dependent on the probing source linearity. DDS nowadays plays an important role in signal generation in many fields of applications for communication systems as well as in radar technology. Modern DDSs are fully integrated, low-cost, single chip solutions that only need an external clock source for generating sinusoidal output signals up to several gigahertz. The DDS benefits from the totally digital generation of the output signal, which allows full control of the signal’s frequency and phase, both with very high precision and resolution. Recent implementations feature automatic sweeping capability, thus allowing the DDS to generate very linear and agile frequency chirps, assuming a high quality and constant frequency reference clock source. We propose to implement a DDS signal generation solution with the capability of a full band sweep in 1 μs. On the receiver side the IF and reference signals will be digitised allowing the use of high flexible data processing techniques. Input/output signals will allow the synchronisation of several systems.

A Homodyne Low Cost Uplink Receiver for Digital Short Range Communication Systems

2007 ◽  
Author(s):  
Ricardo Abreu ◽  
Nuno Almeida ◽  
Joao Nuno Matos ◽  
Nuno Borges de Carvalho ◽  
Jorge Sales Gomes
Keyword(s):  
Communication Systems ◽  
Short Range ◽  
Low Cost

scholarly journals Short-Range Vital Signs Sensing Based on EEMD and CWT Using IR-UWB Radar

2016 ◽  
Author(s):  
Xikun Hu ◽  
Tian Jin
Keyword(s):  
Short Range ◽  
Doppler Radar ◽  
Vital Signs ◽  
Ensemble Empirical Mode Decomposition ◽  
The Body ◽  
Ultra Wideband ◽  
Detection Range ◽  
Wall Movement ◽  
Mode Decomposition ◽  
The Subject

The designed radar sensor realizes the healthcare monitoring capable of short-range to detect the chest-wall movement of the subject caused by cardiopulmonary activities, and wirelessly estimating the distance from the sensor to the subject without any devices being attached to the body. Ensemble empirical mode decomposition (EEMD) based denoise method and 1-D continuous-wavelet transform (CWT) are applied for improving on the detection SNR so that accurate respiration rate and heartbeat rate can be acquired in time domain or frequency domain with further distance. No choosing the conventional Doppler radar only able to capture the Doppler signatures due to the lack of bandwidth information as noncontact sensor, we take full advantages of ultra-wideband (UWB) impulse radar to make it low power consumed and portable conveniently, with flexible detection range and preferable accuracy. This noncontact healthcare sensor system addressed proves the commercial feasibility and vast availability of using compact impulse radar for emerging biomedical applications. Compared with traditional contact measurement devices, experimental results utilizing the 2.3 GHz bandwidth transceiver, demonstrate 100% similar results.

Industrial WSN Based on IR-UWB and a Low-Latency MAC Protocol

Frequenz ◽  
2016 ◽  
Vol 70 (7-8) ◽  
Author(s):  
Rafael Reinhold ◽  
Lisa Underberg ◽  
Armin Wulf ◽  
Ruediger Kays
Keyword(s):  
Wireless Sensor Networks ◽  
Sensor Networks ◽  
Communication Systems ◽  
Ieee 802.15.4 ◽  
Mac Protocol ◽  
High Reliability ◽  
Industrial Applications ◽  
Ultra Wideband ◽  
Wireless Sensor ◽  
Low Latency

AbstractWireless sensor networks for industrial communication require high reliability and low latency. As current wireless sensor networks do not entirely meet these requirements, novel system approaches need to be developed. Since ultra wideband communication systems seem to be a promising approach, this paper evaluates the performance of the IEEE 802.15.4 impulse-radio ultra-wideband physical layer and the IEEE 802.15.4 Low Latency Deterministic Network (LLDN) MAC for industrial applications. Novel approaches and system adaptions are proposed to meet the application requirements. In this regard, a synchronization approach based on circular average magnitude difference functions (CAMDF) and on a clean template (CT) is presented for the correlation receiver. An adapted MAC protocol titled aggregated low latency (ALL) MAC is proposed to significantly reduce the resulting latency. Based on the system proposals, a hardware prototype has been developed, which proves the feasibility of the system and visualizes the real-time performance of the MAC protocol.

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