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UWB signal is robust for indoor dense multipath environment and has delicate time resolution. By taking advantage of these characters, indoor positioning system based on TOA and AOA measurements has been investigated. It has been shown that joint TOA/AOA estimation method has provided excellent performance for indoor localization. However, large bandwidth receiver ADC is of high hardware complexity...
Impulse radio ultra-wideband (IR-UWB) technology offers an accurate ranging ability by exploiting the time of arrival (TOA) information of the narrow pulse. However, capturing this sub-nanosecond (ns) width pulse in dense multipath environment requires expensive and power-hungry high performance analog-to-digital converters (ADCs) and complex digital signal processing. To reduce the complexity, a...
In this paper, a nonparametric approach for time-of-arrival (TOA) estimation in impulse radio ultra wide band (IR-UWB) signals is proposed. It exploits the idea of nonparametric detection, which is always utilized in radar systems for detecting targets in a background of noise with unknown statistical properties. The proposed nonparametric TOA estimator is obtained by basing a well-known generalized...
In this paper, the effect of finite-resolution analog-to-digital converter (ADC) quantization on ultra-wideband (UWB) time of arrival (TOA) estimation is investigated. The deflection criterion is introduced for optimizing the nonuniform quantization. The training based TOA estimation algorithm using maximum likelihood (ML) rule is proposed. Compared with the full-resolution and energy-detection (ED)...
The ranging implementation for IEEE 802.15.4a systems usually requires for high sampling rate high resolution ADCs, which are too complicated and power-hungry for realization. Recent methods have been proposed to make tradeoffs, such as limiting amplitude resolution to a few bits, which results in finite-resolution quantization receiver. In this paper, the influence of the low-bit quantizer on UWB...
Time-of-arrival (TOA) estimator design for impulse radio ultra-wideband (IR-UWB) ranging demands high sampling rate high resolution ADC, which is difficult to implement. Some tradeoffs can be made such as limiting amplitude resolution. In this paper, we propose a two-step threshold selection TOA estimator using a two-bit ADC. The quantization threshold of ADC is set as the coarse threshold to distinguish...
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