Thomas Zasowski

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The need for low-complexity devices with low-power consumption motivates the application of suboptimal noncoherent ultra-wideband (UWB) receivers. This article provides an overview of the state of the art of recent research activities in this field. It introduces energy detection and autocorrelation receiver front ends with a focus on architectures that(More)
The paper presents UWB channel measurements from 3 to 6 GHz for a body area network (BAN) in an anechoic chamber and an office room. Both, transmit and receive antenna were placed directly on the body. Channel parameters as delay spread and path loss are extracted from the measurements and the influence of the body is highlighted. We show that in some(More)
A wireless body area network with an average throughput of 500 kbps based on ultra-wideband pulse position modulation is considered. For a long battery autonomy a hardware aware system optimization with respect to the specific applications at hand is essential. A key feature to achieve power savings is low duty cycle signaling, and its effectiveness when(More)
Among different wireless solutions, ultra-wideband (UWB) communication is one promising transmission technology for wireless body area networks (WBANs). To optimize receiver structures and antennas for UWB WBANs with respect to energy efficiency and complexity, the distinct features of the body area network channel have to be considered. Thus, it is(More)
Due to the ongoing miniaturization of electronic devices and due to a multitude of applications, wireless body area networks (WBANs) have gained much interest recently. Ultra wideband (UWB) communication is one promising transmission technology for WBANs due to reduced hardware complexity. To optimize receiver structures and antennas for UWB WBANs it is(More)
According to the draft versions of the European and Japanese regulation authorities, UWB systems have to use detect and avoid (DAA) mechanisms to avoid interference with existing wireless services. Since most existing wireless services such as GSM, WLAN, and Bluetooth transmit their data burstwise, we propose UWB transmission between adjacent bursts of such(More)
Ultra-wide band (UWB) communication shows great potential for low-power communication for wireless sensor or body area network (BAN) applications. In particular, noncoherent receivers can be implemented with very low complexity. However, impulse radio and low duty cycle signaling involve stringent requirements on timing recovery. Standard synchronization(More)
We consider an UWB PPM based wireless body area network with an average throughput of about 1Mbps. For a long battery autonomy a low duty cycle operation of the nodes and thus a high peak data rate is essential. Due to the moderate path loss a peak data rate in excess of 50 Mbps would be feasible within the FCC transmit power constraints. With current low(More)
Transmitted-Reference (TR) receivers represent a low complexity alternative to RAKE receivers, which are widely used in Ultra Wideband (UWB) communications. Known TR schemes are not very energy efficient since two pulses represent one bit value only. Therefore, we present a TR Pulse Interval Amplitude Modulation (PIAM) scheme which reduces the required(More)
To enable reliable transmission, UWB receivers have to cope with interference from several existing wireless services. Based on spectrum analyzer measurements we will show that stationary or quasi-stationary noise can be handled using a high pass filter. For a narrowband interferer (NBI) in close vicinity such a filtering is not sufficient since the(More)