Jari Iinatti

Jari Iinatti
University of Oulu · Centre for Wireless Communications (CWC)

About

269
Publications
85,228
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4,590
Citations
Citations since 2016
57 Research Items
2480 Citations
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500

Publications

Publications (269)
Chapter
Full-text available
This paper presents the preliminary results of a study on the radio frequency (RF) propagation inside the human skull at several Industrial, Scientific and Medical (ISM) and ultrawideband UWB frequencies. These frequency bands are considered as possible candidates for high data rate wireless brain telemetry. The study is conducted using a high-reso...
Article
Full-text available
This paper presents comprehensive study on fat as propagation medium in abdominal implant communication system at low ultrawideband (UWB) frequency range 3.75-4.25 GHz. The main aim is to investigate how signal propagates through visceral and subcutaneous fat layers and how that information can be exploited in implant communication systems. The stu...
Chapter
This paper presents a simulation-based study on detection of stroke/brain hemorrhage even in the white matter using radio channel characteristics analysis. The idea is to utilize the fact that blood has different dielectric properties than brain’s white and grey matters and, thus, additional blood areas inside the brain change radio channel charact...
Chapter
This paper presents a study on the in-body propagation using pork meat at the lower ultrawideband (UWB) frequency band 3.74-4.25 GHz of the wireless body area network (WBAN) standard 802.15.6. Pork meat in terms of the dielectric properties is one of the most similar to human tissues and thus is commonly used in in-body propagation studies. Neverth...
Conference Paper
Full-text available
This paper presents a study on the in-body propagation using pork meat at the lower ultrawideband (UWB) frequency band 3.74-4.25 GHz of the wireless body area network (WBAN) standard 802.15.6. Pork meat in terms of the dielectric properties is one of the most similar to human tissues and thus is commonly used in in-body propagation studies. Neverth...
Conference Paper
Full-text available
This paper presents a simulation-based study on detection of stroke/brain hemorrhage even in the white matter using radio channel characteristics analysis. The idea is to utilize the fact that blood has different dielectric properties than brain's white and grey matters and, thus, additional blood areas inside the brain change radio channel charact...
Conference Paper
Full-text available
This paper presents a study on the impact of the antenna cavity on the in-body propagation and ultra wideband wireless body area networks (UWB-WBAN) radio channel characteristics between the capsule endoscope and the on-body antenna. The study is conducted with CST Studio Suite simulations and one of its anatomical voxel models. A simplified capsul...
Article
Emerging healthcare radio technologies are designed to operate in the 2:4GHz industrial, scientific and medical (ISM) band. Since both standardized (Bluetooth and Wi-Fi) and non-standardized (proprietary) devices use the same frequency band, the aggregate interference may significantly affect the performance of medical wireless systems. This paper...
Article
Full-text available
This paper presents a study on the ultra wideband (UWB) radio channel characteristics between a capsule endoscope and a directive on-body antenna in different parts of the small intestine. The study is conducted using a finite integration technique (FIT) based electromagnetic simulation software CST Studio Suite and four of its anatomical voxel mod...
Chapter
This paper presents for the first time a simulation study on the impact of the sternotomy wires on the ultra-wideband (UWB) channel characteristics. The simulations are based on the finite integration technique (FIT). The simulation results are verified with the propagation path calculations as well as with the measurement data. It is found that th...
Chapter
This paper presents the effect of a human body on ultra-wideband off-body wireless body area network radio channels. The work is based on static measurements in an anechoic chamber by using a vector network analyzer in a 2–8 GHz frequency band. Thirteen antenna locations on a human body are used while the off-body node is attached to a pole at a di...
Article
Wearable devices and wireless communications, combined with personalized health management, are future trends that healthcare practices and procedures are heading toward. To facilitate this progress, new technologies and methods are required to provide reliable measurements, end-to-end communications, and data analysis mechanisms from the data sour...
Chapter
This paper presents a study on the fat in the abdomen area as a propagation medium in wearable and implant communications systems. Propagation via subcutaneous and visceral fat is considered separately. Simulations and measurements are done for both female and male bodies with the on-body antennas designed for in-body communications. Propagation pa...
Chapter
This paper presents a study on the radio channel characteristics between an endoscope capsule and an on-body antenna in different parts of the small intestine with different on-body antenna location options. The study is conducted using finite integration technique based electromagnetic simulation software CST and one of its anatomical voxels. An e...
Chapter
This paper presents measurement results on pseudo-dynamic ultra wideband off-body wireless body area network radio channels. The measurements are performed in an anechoic chamber in a 2–8 GHz frequency band by utilizing a vector network analyzer. A dynamic walking sequence was modeled by a test person who took five different body postures which wer...
Conference Paper
Full-text available
This paper presents a study on the fat in the abdomen area as a propagation medium in wearable and implant communications systems. Propagation via subcutaneous and visceral fat is considered separately. Simulations and measurements are done for both female and male bodies with the on-body antennas designed for in-body communications. Propagation pa...
Conference Paper
Full-text available
This paper presents a study on the radio channel characteristics between an endo-scope capsule and an on-body antenna in different parts of the small intestine with different on-body antenna location options. The study is conducted using finite integration technique based electromagnetic simulation software CST and one of its anatomical voxels. An...
Conference Paper
Full-text available
This paper presents measurement results on pseudo-dynamic ultra wideband off-body wireless body area network radio channels. The measurements are performed in an anechoic chamber in a 2-8 GHz frequency band by utilizing a vector network analyzer. A dynamic walking sequence was modeled by a test person who took five different body postures which wer...
Book
Full-text available
As fifth generation (5G) research is maturing towards a global standard, the research community has started to focus on the development of beyond-5G solutions and the 2030 era, i.e. 6G. In the future, our society will be increasingly digitised, hyper-connected and globally data driven. Many widely anticipated future services will be critically depe...
Article
Full-text available
This paper presents a comprehensive study on the impact on the sternotomy wires on the characteristics of ultra wideband (UWB) radio propagation channel in the human chest area. The study is conducted using two simulation models: a planar layer model and a three dimensional elliptical layer model. The study includes antennas designed for on-body an...
Conference Paper
Full-text available
This paper presents measurements on dynamic off-body radio channels in an ultra wideband frequency range for wireless body area network communications focusing on the human body shadowing effect. Measurements were conducted in an anechoic chamber at a bandwidth of 2-8 GHz by using a vector network analyzer. The investigation was performed at severa...
Article
This paper presents a comprehensive study on the impact of sternotomy wires and a medical implant on the ultra-wideband (UWB) channel characteristics by studying intra-body propagation in the vicinity of on-body antennas. The main contribution on this work is to verify propagation path calculations with measurement data taken from a volunteer that...
Conference Paper
Full-text available
This paper presents for the first time a simulation study on the impact of the sternotomy wires on the ultra wideband (UWB) channel characteristics. The simulations are based on the finite integration technique (FIT). The simulation results are verified with the propagation path calculations as well as with the measurement data. It is found that th...
Conference Paper
Full-text available
In this paper, the impact of the sternotomy wires and aortic valve implant on the ultra-wideband (UWB) channel characteristics is studied. The evaluations are performed by calculations, measurement data analysis, and power flow simulations. The aim is to show that implants, which consist of steel, titanium, and other highly conductive materials, do...
Chapter
Wireless communications’ infrastructures are frequently selected as a cable replacement in many applications, giving an immediate advantage on the wireless investment. However, the worldwide proliferation of wireless local area network (WLAN) imposed large investments on the network security. In the early days of the Internet, its layered protocol...
Conference Paper
Full-text available
Dynamic off-body ultra wideband channels are examined by way of anechoic chamber measurements at a 3-5 GHz frequency band in frequency domain with a help of a fast sweeping vector network analyzer. Five antenna locations on the body are selected: right wrist, left wrist with an antenna on the palm or back side, left arm (AL) and left ankle (LA). Th...
Conference Paper
Full-text available
Bluetooth Low Energy (BLE) devices are becoming common in hospital scenarios. This technology is widely employed to collect patients’ vital signs, to provide wireless connectivity to medical equipment, and to enable communications between devices carried by hospital personnel, patients and visitors. This paper presents a mathematical model to evalu...
Conference Paper
Full-text available
This paper focus on an experimental performance evaluation of the recently published Bluetooth Low Energy (BLE) 5 technology. Measurements have been conducted both in indoors and outdoors scenarios. Performance of BLE 5 is compared to a previous release of BLE 4 which is currently the most used technology in commercial wireless healthcare and medic...
Conference Paper
Full-text available
In this paper, a generic wake-up radio (WUR) based medium access control (MAC) protocol (GWR-MAC) has been evaluated from the energy consumption point of view. GWR-MAC protocol’s goal is to achieve energy efficiency by avoiding idle listening since the sensor nodes are awakened only when there is a need for communication. A successful wake-up signa...
Conference Paper
Full-text available
The goal of this paper is to provide a comprehensive overview of the coexistence nature of wireless technologies most likely to be found in medical scenarios’ environment. The diversity and number of these technologies is increasing constantly leading to potential interference problems and performance degradation of wireless medical applications wh...
Article
Full-text available
Long lifetime of a wireless sensor/actuator node, low transceiver chip cost and large coverage area are the main characteristics of the low power wide area network (LPWAN) technologies. These targets correlate well with the requirements imposed by the health and wellbeing applications of the digital age. Therefore, LPWANs can found their niche amon...
Article
Full-text available
Electromagnetic simulation based channel modeling is presently considered as a promising option for wireless body area network (WBAN) channel modeling. The benefits of simulation-based channel modeling are obvious: realistic channel characteristics for required environments and situations are provided flexibly and cheaply. Additionally, the use of...
Article
Full-text available
The article provides an analysis and reports experimental validation of the various performance metrics of the LoRa low-power wide-area network technology. The LoRa modulation is based on chirp spread spectrum, which enables use of low-quality oscillators in the end device, and to make the synchronization faster and more reliable. Moreover, LoRa te...
Conference Paper
Full-text available
A dual-radio solution for wireless body area networks (WBANs) is proposed in this paper. Solution is based on the usage of wake-up receiver (WUR) and impulse radio ultra wideband (IR-UWB) technique. In the proposition, the data to the hub is transmitted using IR-UWB and the control messages back to a node are received using WUR. Energy efficiency m...
Conference Paper
Full-text available
One of the main challenges for wireless body area networks (WBANs) is to evaluate realistic methods to generate channel models for new different purposes and various environments quickly and flexibly. Finite integration technique (FIT) has shown to be promising method for modeling channels characteristics in WBAN deployment scenarios. Applying simu...
Conference Paper
Full-text available
This article presents path loss models for creeping waves propagation around a human body at ultra-wideband frequency of 2–8 GHz. The results are based on measurements in an anechoic chamber using a vector network analyzer. Three antenna types are used: prototype dipole and double loop antennas together with the commercial Skycross antenna. The fir...
Article
Full-text available
This letter reports the shadowing effects of a human body on dynamic ultra-wideband on-body radio links. A vector network analyzer is used to sweep the 3−5 GHz frequency band in an anechoic chamber. The sweep time is set fast enough to fulfil the channel coherence time requirements. This enables the data analysis to be performed in time domain by e...
Article
Full-text available
Wireless communications' infrastructures are frequently selected as a cable replacement in many applications giving an immediate advantage on the wireless investment. However, the worldwide proliferation of wireless local area network (WLAN) imposed large investments on the network security. In the early days of Internet, its layered protocol stack...
Article
This article presents an updated survey on research related to Ultra Wideband (UWB) communications, particularly that of impulse radio (IR) technology. In addition to the research, we survey UWB physical layer (PHY) specifications of the two existing standards – the IEEE 802.15.6-2012 and the IEEE 802.15.4-2015 – as well as the leading global UWB s...
Article
Full-text available
Harmonization for scientific and commercial radio uses is one of the unsolved problems in academia, industry, and regulatory bodies. The demands for commercial radio, mobile communications, and broadcasting have significantly increased over the past few decades; therefore, interference has become a major concern. There is an increasing need to prev...
Article
Full-text available
For preventing malicious nodes joining wireless sensor networks (WSNs), an access control mechanism is necessary for the trustworthy cooperation between the nodes. In addition to access control, recently, privacy has been an important topic regarding how to achieve privacy without disclosing the real identity of communicating entities in the WSNs....
Article
Full-text available
By modulating the electric field induced to a human body, it is possible to transfer data wirelessly using the body as a transmission medium. This method is referred to as human body communication (HBC), which has multiple advantages in comparison with the traditional radio frequency (RF) communication. First, it alleviates the traffic load from th...
Article
Full-text available
A categorized radio channel modeling for wireless ultra-wideband on-body body area networks is discussed. Measurements in an anechoic chamber at fourteen antenna locations are conducted in a 2–8 GHz band. The dipole and double loop antenna types are used. Six link classes are formed based on the antenna spots on the torso, head or limb. The limb-li...
Conference Paper
Full-text available
The technological innovation has enabled the spread of safety-related systems in many domains, such as public transport, energy, and medical devices. In these applications, security is one of the primary concerns. This paper proposes a watermark-based blind physical layer security (WBPLSec) utilizing a jamming receiver in conjunction with spread sp...
Conference Paper
Full-text available
This article examines the effect of divergent human tissue types and volumes on the matchings of ultra-wideband (UWB) antennas. The work is based on measurements in an anechoic chamber with a vector network analyzer by sweeping a frequency range of 2–8 GHz. Two planar prototype UWB antenna types were applied: the dipole and the double loop antenna....
Conference Paper
Low power consumption, low transceiver chip cost and large coverage area are the main characteristics of the low power wide area networks (LPWAN) technologies. We expect that LPWAN can be part of enabling new human-centric health and wellness monitoring applications. Therefore in this work we study the indoor performance of one LPWAN technology, na...
Conference Paper
Full-text available
Communication Based Train Control (CBTC) and the European Rail Traffic Management Systems (ERTMS) are prevailing radio controlled systems for railway. As a part of the ERTMS standard, the European Train Control System (ETCS) implements on-board control systems throughout multiple radios. CBTC makes use of RF-based data communication systems (DCSs)...
Article
Full-text available
In this Letter, performance analysis of an impulse radio (IR) ultra wideband (UWB) correlation based receiver utilising non-coherent detection of orthogonal signalling is provided. The receiver's performance is presented through analysis and simulations in the additive white Gaussian noise (AWGN) channel. Results which show that in noncoherent dete...