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Coherent DS-CDMA Acquisition in Time-Variant Channels at Low Signal to Noise Ratios

Groh, Ingmar and Sand , Stephan (2011) Coherent DS-CDMA Acquisition in Time-Variant Channels at Low Signal to Noise Ratios. ICL GNSS 2011, 29-30. Juni 2011, 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/
Document Type:Conference or Workshop Item (Poster)
Title:Coherent DS-CDMA Acquisition in Time-Variant Channels at Low Signal to Noise Ratios
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Groh, IngmarIngmar.Groh (at) dlr.deUNSPECIFIED
Sand , StephanStephan.Sand (at) dlr.deUNSPECIFIED
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 Dates:29-30. Juni 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:22 Jul 2011 09:55

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