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In wireless applications, power consumption has been, and will be, one of the important characteristics when designing any wireless device. This is the case especially in sensor networks where a single sensor may be functioning, hopefully for very long time, without external power source. Generally, the architecture complexity reduces the battery life, but the performance increases with complexity...
New technologies can help to develop preventive healthcare, thereby leading to significant life quality improvements. Medical Body Area Networks are expected to become a key element in tomorrow's medical IT infrastructure by enabling the long term collection and analysis of health parameters. For this vision to become a reality, several challenges must be addressed. This work focuses on the technological...
We demonstrate a low power temporal-difference image sensor with wireless communication capability designed specifically for imaging sensor networks. The event-based image sensor features a 64×64 pixel array and can also report standard analog intensity images. An ultra-wide-band (UWB) radio channel allows to transmit digital temporal difference images wirelessly to a receiver with high rates and...
The electromagnetic environment in a hospital is characterized by means of a measurement campaign. This serves as a basis for the evaluation of best-suited future technologies to be used for wireless patient monitoring, where highest quality of service is required for sensors recording vital data. Results show that the UWB band features equal dynamic ranges as the ISM band but allows operation at...
Current trends in wireless communications emphasize the development of UWB (Ultra-Wide Band with bandwidths greater than 500 MHz or 20% of center frequency) radios. As the size of the digital part scales down, more and more components are being pushed into the digital domain. As a consequence of this, in receiver architectures, the ADCs are being pushed more towards the antenna in the front end. This...
Wireless sensor network (WSN) applications demand ultra low power devices. Digital Ultra Wideband (UWB) transceiver can be used as the communication module in a WSN due it its potential for location tracking, ranging and low data rate communication. Current digital UWB receiver architecture incorporates heavy parallelism, which significantly increases power consumption, especially during the acquisition...
In this paper, we consider a distributed detection problem in wireless sensor networks (WSNs) using ultrawide bandwidth (UWB) communications. Due to the severe restrictions on power consumption, energy efficiency becomes a critical design issue in WSNs. UWB technology has low-power transceivers, low-complexity and low-cost circuitry which are well suited to the physical layer requirements for WSNs...
The IEEE802.15.4a Task Group for wireless personal area networks (WPAN) is working on an ultra-wideband (UWB) radio standard for the indoor sensor network applications. In 4a Task Group, various modulation and signal sources are being proposed to find the sensor network solutions satisfied with low cost and low power consumption. Among of them, the non-coherent direct sequences (DS) chaotic system...
Ultra-wideband impulse radio (UWB-IR) merges low complexity system design with good localization capabilities enabling low-data-rate/location-tracking (LDR/LT) sensor network design. However power consumption of the sensor nodes is a fundamental problem. Therefore, a simple wake-up scheme for asymmetric network topologies is investigated, where a static wireless backbone communicates with many semi-active...
Implanted biosensor networks are a special class of wireless sensor networks used in-vivo for various medical applications. One of major challenges of continuous implanted sensing is the power problems due to implanted sensors' communication cost. A deduction in theory has been made to prove the relationship between energy cost per bit and the data rate of one kind of signal. So choosing an appropriate...
Implanted biosensor networks are a special class of wireless sensor networks used in-vivo for various medical applications. One of major challenges of continuous implanted sensing is the power problems due to implanted sensors' communication cost. A deduction in theory has been made to prove the relationship between energy cost per bit and the data rate of one kind of signal. So choosing an appropriate...
In the intensive care unit, or during anesthesia, patients are attached to monitors by cables. These cables obstruct nursing staff and hinder the patients from moving freely in the hospital. However, rapidly developing wireless technologies are expected to solve these problems. To this end, this study revealed problem areas in current patient monitoring and established the most important medical parameters...
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