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The recent years showed an increasing demand for higher data rates in communication systems in general. To keep up with the reduced time-to-market in this area, an elaborate prototyping concept is inevitable. The authors propose a prototyping platform which combines the advantages of the flexibility of a digital signal processor with the efficient parallelization capabilities of a field-programmable...
This paper proposes a combined UWB LDR-LT/HDR structure and cooperation possibilities between both systems. A possible structure that utilizes the LDR physical layer to transmit and receive the HDR signaling information for an improved system performance with reduced power consumption is investigated. In addition, an adaption layer is proposed which organizes the cooperation between the two systems...
This paper discusses a maximum likelihood (ML) estimator for the localization of mobile nodes in communication networks. The derived estimator is optimized for ranging measurements exploiting the received signal strength (RSS). For this purpose, the bias and uncertainties of the RSS based ranging procedure are analyzed, considering a path loss model of an indoor ultra-wideband (UWB) network under...
Reconflgurability of transceivers for wireless communication systems such as GSM, UMTS, WiMAX and WLAN will become increasingly important. Therefore, a flexible and reliable software and hardware architecture based on the software-defined radio (SDR) paradigm is a meaningful concept. SDRs have paved the way towards cognitive radios (CR), which are based on SDRs that additionally sense their environments,...
The Ultra-Wideband Radio Technology (UWB-RT) enables accurate Location and Tracking (LT) applications. However, the required and sophisticated time of arrival (ToA) ranging procedure relies on accurate synchronizations and time measurements. Non-cooperative nodes, not supporting the ToA feature, cannot be localized with this LT approach. Other LT approaches exploit the received signal strength (RSS)...
Ultra-wideband (UWB) enables accurate Localization and Tracking (LT) applications. However, the required and sophisticated time of arrival (ToA) ranging procedure relies on accurate synchronization and time measurements. Today, only few UWB devices support the required ranging feature. Examples are pulse based low data rate (LDR) UWB devices. Conventional multiband OFDM based high data rate (HDR)...
Ultra-wideband (UWB) enables accurate Localization and Tracking (LT) applications. However, the required and sophisticated time of arrival (ToA) ranging procedure relies on accurate synchronization and time measurements. Today, only few UWB devices support the required ranging feature. Examples are pulse based low data rate (LDR) UWB devices. Conventional multiband OFDM based high data rate (HDR)...
To support high-definition television, the revision of DVB-T, the terrestrial digital video broadcasting standard, has recently been developed under the abbreviation DVB-T2. The provision of the anticipated high data rate services requires highly accurate synchronisation and frequency acquisition and tracking. Setting out from the procedure defined by the DVB-T2 implementation guidelines provided...
Spectrum sensing is a central part in a cognitive radio and therefore a thorough design of a spectrum sensor is of highest priority. Here, a novel implementation of a spectrum sensing technique, using a generalized version of the Neyman Pearson test, is considered. This novel implementation overcomes the usual prerequisite of the known noise power. This benefit is achieved by normalizing the signal...
To support high definition television (HDTV), the revision of DVB-T, the terrestrial digital video broadcasting standard, has recently been developed under the abbreviation DVB-T2. The provision of the anticipated high data rate services requires a highly accurate synchronization and frequency acquisition and tracking. Setting out from the procedure defined by the DVB-T2 implementation guidelines...
An increasing demand for applications in the area of Ultra-Wideband Radio Technology led to the EUWB (Coexisting Short Range Radio by Advanced Ultra-Wideband Radio Technology, FP7-ICT-215669, www.euwb.eu) project, which has been started in April 2008. The goal of this industry-led initiative of major industrial and excellent academic organizations is the improvement, integration, and the applications...
In recent years extensive research was carried out in order to develop applications for the Ultra-Wideband (UWB) technology and to resolve the practical challenges in implementing an efficient UWB communication system utilizing the UWB impulse radio for precision localization. ToA (Time of Arrival) or TDoA (Time Difference of Arrival) of ranging frame are widely used because ToA and TDoA provide high...
Cognitive radios require spectrum sensing. IEEE 802.22 defines constraints on conceivable spectrum sensing techniques. In order to fulfill theses constraints on the required detection probability and allowed false alarm probability, the signal sensing requires a certain sensing time period and an appropriately adjusted decision threshold. This manuscript presents a novel dynamic spectrum sensing scheme...
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