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To increase the data rate for transmitted reference (TR) ultra-wideband (UWB) systems, M-ary pulse position modulation (PPM) is used in this paper. The multiple-access performance of such systems is investigated in a multipath environment. A new method to derive the variance of the Gaussian random variable resulted from multiple-access interference (MAI) is developed using the power delay profile...
To increase the transmission data rate, we propose to use M-ary pulse position modulation (PPM) for transmitted reference (TR) ultra-wideband (UWB) systems. The performance of TR UWB systems employing M-ary PPM is investigated in multipath, multiuser environments without centralized power control. The interference from high-power users is shown to significantly degrade the performance of TR UWB systems...
Transmitted reference (TR) ultra-wideband (UWB) systems have been proposed to alleviate the implementation issues of UWB Rake receivers due to channel estimation and the need for a large number of Rake fingers. However, the wideband analog delay line used in TR receivers is difficult to implement in practice as well. A slightly frequency-shifted reference (FSR) UWB system has been introduced to retain...
Ultra-wideband (UWB) communications using transmitted reference (TR) have been studied in multipath, multiuser environments under the assumption that interfering users have the same power as the desired user at the receiver. This assumption frequently does not hold in ad-hoc wireless communications where centralized power control is not employed due to survivability and complexity constraints. In...
Pulse discrimination and rate adaptation have been shown to yield significant performance improvement for ultra-wideband (UWB) impulse radio (IR) networks in high-power pulse interfering environments. Here we extend these ideas and present a technique where receivers autonomously estimate the interference environment on a packet time scale. We show how the combination of the three techniques significantly...
This paper concerns the design and verification of a realtime communication protocol for sensor data collection and processing between an embedded computer and a DSP. In such systems, a certain amount of data loss without recovery may be tolerated. The key issue is to define and verify the correctness in the presence of these lost data frames under real-time constraints. This paper describes a temporal...
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