Arie Reichman

Standardization of body area networks

Recent advances in wireless technology have led to the development of wireless body area networks (WBAN), where a set of communicating devices are located around the human body. IEEE 802.15.6 is the Task Group established to develop guideline for using wireless technologies for medical device communications in various healthcare services. The operating scenarios are determined based on the location of the communicating nodes, i.e. implant, body surface and external. The system requirements include extremely low power operation, low weight, and small size, fault tolerant system operation. It should be capable of energy scavenging or battery-less operation with a small form factor for the whole radio, antenna, power supply system. The sensor should have the flexibility necessary to adapt to the users state and changes in the environment.

Body Area Networks: Applications, Architectures and Challenges

Recent advances in wireless technology have led to the development of wireless body area networks (WBAN), where a set of communicating devices are located around the human body. IEEE 802.15 working group established a study group, body area network, to develop guideline for using wireless technologies for medical device communications in various healthcare services. There is a wide range of potential applications and user scenarios in hospital, home and gym. Wearable applications include body automation, healthcare, medical monitoring, entertainment, and body interaction and implantable applications cover medical implants, e.g. capsule endoscope and pacemaker.

The architecture of ambient assisted living system

Ambient Assisted Living is an intelligent system of assistance that can help senior citizens to improve their quality of life, stay healthier, and extend their lifespan, thus enabling them to expand their active and creative participation in the community. The system provides an interactive environment for people with special needs, based on ubiquitous sensing, individual-environment interaction, context awareness, and learning information systems. It provides a full cycle of processes, including sensing the individuals activity and behavior, preprocessing of sensors data, information aggregation, reasoning, and interaction with the individual and with external factors such as relatives and care services. The system is based on ambient intelligence, i.e. its infrastructure is pervasive, with a large number of distributed devices that communicate between themselves as well as with centralized services.

Resource management in satellite communication systems — Heuristic algorithms

The resource allocation problem of a satellite communication system is important due to the high cost of frequency bandwidth. In systems using DVB-S2 links the optimization is related to the classical multi-knapsack problem. Performance criteria are defined and two heuristic algorithms are presented and compared using Monte-Carlo simulation.

Play system for therapy for the elderly

Growth of the elderly population and a shortage of therapists indicates the value of using computer systems for therapy. This paper describes a system that integrates entertainment and therapy: a Play System for therapy for the elderly. A specially designed game platform enables diagnosis and treatment of cognitive problems through game playing. The system is supervised by professional trainer who can control several patients at the same time from a remote location. The training programs and game results are stored in an internet database.

Broadband wireless mesh networks

A wireless network with a mesh topology work is reliable and offers redundancy. Broadband modern networks use MIMO and OFDMA techniques. In broadband wireless mesh networks the problems of time, frequency, and space resource allocations are different than in a cellular system and more complicated due to distributed control and management. This document presents an overview of methods and requirements, and identifies some open problems in the field of broadband wireless mesh networks.

Cooperative communication overview

The various architectures of cooperative communication are among the hottest topics in research and in the new wireless standards. They are applicable both to cellular and ad hoc systems to increase coverage and throughput.

An overview of multi-mode multi-user adaptation and scheduling techniques in mimo-based fourth-generation wireless systems

MIMO-OFDM is widely recognized today as a key combination of technologies to achieve high spectral efficiency and high link reliability over space and frequency selective wireless channels, at a reasonable hardware cost. Both OFDM and MIMO have a variety of modes of operation and parameters and for each channel state, users¿ requirements of data transmission and criterion of estimation performance, there is an optimal scheme and set of parameters based on channel state information. Adaptive switching between MIMO-OFDMA schemes yields significant capacity gains over fixed transmission schemes. A combination of modulation and coding scheme and MIMO method maximizes the throughput whilst satisfying a predefined average BER.

Distributed synchronization in a wireless mesh communication network

Synchronization in a wireless mesh communication network can be achieved by sending messages among nodes that include information regarding the time of the node and its accuracy. The nodes that receive such messages may adjust their time according to the received messages. This paper proposes a robust algorithm with two stages: acquisition and tracking, and applicability to any network architecture.

REMON — 4G consortium of wireless communication

REMON is the Israeli 4G consortium of wireless communication and after five years of R&D activity will perform a field test at the beginning of 2010. The consortium developed the MIMO-OFDMA and other technologies to increase the capacity of cellular networks 100 times. The paper describes the goals and technical achievements in industrial companies and academic institutes.