Groh, Ingmar and Sand , Stephan (2011) Coherent DS-CDMA Acquisition in Time-Variant Channels at Low Signal to Noise Ratios. ICL GNSS 2011, 2011-06-29 - 2011-06-30, Tampere, Finnland.
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Abstract
This paper presents a novel acquisition method for time-variant channels, which yield a different channel phasor for each transmission symbol due to the non-zero Doppler frequency. The alternating channel phasors prevent a coherent symbol averaging and require an incoherent or a differentially-coherent symbol averaging instead. Compared to the incoherent symbol averaging, the differentially-coherent symbol averaging yields a higher acquisition probability, since it avoids the squaring loss (SL). However, high data rates with rapidly alternating modulation symbols reduce the acquisition probability of the differentially-coherent symbol averaging remarkably. Thus, this paper presents a novel rate independent delay acquisition method, that even yields a higher acquisition probability compared to the differentially-coherent symbol averaging and compared to the incoherent symbol averaging anyway. The increased acquisition probability in our simulation results corresponds to a signal to noise ratio (SNR) gain of at least 0.4 dB compared to the differentially-coherent symbol averaging and of at least 1 dB compared to the incoherent symbol averaging, and we reduce the receiver complexity at the same time.
Item URL in elib: | https://elib.dlr.de/70498/ | ||||||||||||
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Document Type: | Conference or Workshop Item (Poster) | ||||||||||||
Title: | Coherent DS-CDMA Acquisition in Time-Variant Channels at Low Signal to Noise Ratios | ||||||||||||
Authors: |
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Date: | June 2011 | ||||||||||||
Refereed publication: | Yes | ||||||||||||
Open Access: | No | ||||||||||||
Gold Open Access: | No | ||||||||||||
In SCOPUS: | No | ||||||||||||
In ISI Web of Science: | No | ||||||||||||
Status: | Published | ||||||||||||
Keywords: | squaring loss, coherent averaging, differentiallycoherent averaging, multiple signal classification | ||||||||||||
Event Title: | ICL GNSS 2011 | ||||||||||||
Event Location: | Tampere, Finnland | ||||||||||||
Event Type: | international Conference | ||||||||||||
Event Start Date: | 29 June 2011 | ||||||||||||
Event End Date: | 30 June 2011 | ||||||||||||
HGF - Research field: | Aeronautics, Space and Transport (old) | ||||||||||||
HGF - Program: | Space (old) | ||||||||||||
HGF - Program Themes: | W KN - Kommunikation/Navigation | ||||||||||||
DLR - Research area: | Space | ||||||||||||
DLR - Program: | W KN - Kommunikation/Navigation | ||||||||||||
DLR - Research theme (Project): | W - Vorhaben GNSS2/Neue Dienste und Produkte (old) | ||||||||||||
Location: | Oberpfaffenhofen | ||||||||||||
Institutes and Institutions: | Institute of Communication and Navigation > Communications Systems | ||||||||||||
Deposited By: | Groh, Ingmar | ||||||||||||
Deposited On: | 22 Jul 2011 09:55 | ||||||||||||
Last Modified: | 24 Apr 2024 19:35 |
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