By Alexander Gerald Götz
During this paintings, coherent concepts for time distinction of arrival estimation for frequency hopping GSM indications are brought. The strategies supply major advancements in accuracy in comparison to state of the art ideas and are preferrred for hugely exact localization of GSM cellphones. the most important artistic notion relies at the interpretation of a frequency hopping GSM sign as a wideband sign. therefore, the appropriate bandwidth for time distinction of arrival estimation might be elevated from 2 hundred kHz for the narrowband burst sign to the entire uplink bandwidth of the corresponding GSM typical. For E-GSM 900 structures, as much as 35 MHz of bandwidth might be hired. accordingly, a localization accuracy within the scale of five - 10m is achieveable. The provided coherent strategies for time distinction of arrival estimation allow novel purposes with elevated accuracy standards similar to hugely exact localization in seek and rescue eventualities. additionally, the coherent estimation suggestion is usually tailored to any frequency hopping sign resource similar to TETRA, DECT, IEEE 802.15.4 (ZigBee) and IEEE 802.15.1 (Bluetooth) units.
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Extra resources for Coherent Time Difference of Arrival Estimation Techniques for Frequency Hopping GSM Mobile Radio Signals
Example text
4: Illustrative representation of coherence and phase relationships The value ΔφBA characterizes the phase offset between receiving station A and B and is supposed to be constant. This assumption is assured by the synchronization modules in the corresponding receiving stations and is valid of all burst signals. The values Δφi,j represent the phase offsets of adjacent burst signals i and j and are assumed to be identical for the corresponding received burst signals in receiving station A and B. The term coherence refers to the phase preserving nature of the wideband signal acquisition and time difference of arrival estimation techniques.
A training or synchronization sequence). The time difference of arrival ΔτBA can then be obtained by subtracting these two values. • The time difference of arrival ΔτBA is estimated directly using both received signals. Commonly, no part of the signals has to be known beforehand. Many state-of-the-art techniques for time difference of arrival estimation rely on the first approach. The techniques presented in this work are entirely based on the second approach. 2 Generic Radio Channel Model The derivation and analysis of the time difference of arrival estimation techniques requires a generic radio channel model which is introduced in the following.
13) The first signal to noise ratio correction factor depends on the employed burst type. 26 dB compared to access bursts due to their increased length and signal energy. The numeric values for the correction factor TBurst /TF rame are given in Tab. 1. 1: SNR correction factor for different burst types The second signal to noise ratio correction factor is dependent on the acquisition bandwidth of the wideband frontend. In the following table, it is assumed that the full allocated uplink bandwidth of the corresponding GSM standard is used.