Local Frequency Folding Method for Fast PN-Code Acquisition

Wenquan FENG; Xiaodi XING; Qi ZHAO; ZuLin WANG

doi:10.1587/transcom.E97.B.1072

Local Frequency Folding Method for Fast PN-Code Acquisition

Wenquan FENG, Xiaodi XING, Qi ZHAO, ZuLin WANG

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The large Doppler offset that exists in high dynamic environments poses a serious impediment to the acquisition of direct sequence spread spectrum (DSSS) signals. To ensure acceptable detection probabilities, the frequency space has to be finely divided, which leads to complicated acquisition structures and excessively long acquisition time at low SNR. A local frequency folding (LFF) method designed for combined application with established techniques dedicated to PN-code synchronization is proposed in this paper. Through modulating local PN-code block with a fixed waveform obtained by folding all frequency cells together, we eliminate the need for frequency search and ease the workload of acquisition. We also analyze the performance of LFF and find that the detection performance degradation from folding can be compensated by FFT-based coherent integration. The study is complemented with numerical simulations showing that the proposed method has advantages over unfolding methods with respect to detection probability and mean acquisition time, and the advantage becomes obvious but limited if the folded number gets larger.

Publication: IEICE TRANSACTIONS on Communications Vol.E97-B No.5 pp.1072-1079

Publication Date: 2014/05/01

Publicized

Online ISSN: 1745-1345

DOI: 10.1587/transcom.E97.B.1072

Type of Manuscript: PAPER

Category: Wireless Communication Technologies

Authors

Wenquan FENG
  Beihang University
Xiaodi XING
  Beihang University
Qi ZHAO
  Beihang University
ZuLin WANG
  Beihang University

Keyword

PN-code acquisition, local frequency folding, detection probability, mean acquisition time

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Wenquan FENG, Xiaodi XING, Qi ZHAO, ZuLin WANG, "Local Frequency Folding Method for Fast PN-Code Acquisition" in IEICE TRANSACTIONS on Communications, vol. E97-B, no. 5, pp. 1072-1079, May 2014, doi: 10.1587/transcom.E97.B.1072.
Abstract: The large Doppler offset that exists in high dynamic environments poses a serious impediment to the acquisition of direct sequence spread spectrum (DSSS) signals. To ensure acceptable detection probabilities, the frequency space has to be finely divided, which leads to complicated acquisition structures and excessively long acquisition time at low SNR. A local frequency folding (LFF) method designed for combined application with established techniques dedicated to PN-code synchronization is proposed in this paper. Through modulating local PN-code block with a fixed waveform obtained by folding all frequency cells together, we eliminate the need for frequency search and ease the workload of acquisition. We also analyze the performance of LFF and find that the detection performance degradation from folding can be compensated by FFT-based coherent integration. The study is complemented with numerical simulations showing that the proposed method has advantages over unfolding methods with respect to detection probability and mean acquisition time, and the advantage becomes obvious but limited if the folded number gets larger.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.E97.B.1072/_p

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@ARTICLE{e97-b_5_1072,
author={Wenquan FENG, Xiaodi XING, Qi ZHAO, ZuLin WANG, },
journal={IEICE TRANSACTIONS on Communications},
title={Local Frequency Folding Method for Fast PN-Code Acquisition},
year={2014},
volume={E97-B},
number={5},
pages={1072-1079},
abstract={The large Doppler offset that exists in high dynamic environments poses a serious impediment to the acquisition of direct sequence spread spectrum (DSSS) signals. To ensure acceptable detection probabilities, the frequency space has to be finely divided, which leads to complicated acquisition structures and excessively long acquisition time at low SNR. A local frequency folding (LFF) method designed for combined application with established techniques dedicated to PN-code synchronization is proposed in this paper. Through modulating local PN-code block with a fixed waveform obtained by folding all frequency cells together, we eliminate the need for frequency search and ease the workload of acquisition. We also analyze the performance of LFF and find that the detection performance degradation from folding can be compensated by FFT-based coherent integration. The study is complemented with numerical simulations showing that the proposed method has advantages over unfolding methods with respect to detection probability and mean acquisition time, and the advantage becomes obvious but limited if the folded number gets larger.},
keywords={},
doi={10.1587/transcom.E97.B.1072},
ISSN={1745-1345},
month={May},}

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TY - JOUR
TI - Local Frequency Folding Method for Fast PN-Code Acquisition
T2 - IEICE TRANSACTIONS on Communications
SP - 1072
EP - 1079
AU - Wenquan FENG
AU - Xiaodi XING
AU - Qi ZHAO
AU - ZuLin WANG
PY - 2014
DO - 10.1587/transcom.E97.B.1072
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E97-B
IS - 5
JA - IEICE TRANSACTIONS on Communications
Y1 - May 2014
AB - The large Doppler offset that exists in high dynamic environments poses a serious impediment to the acquisition of direct sequence spread spectrum (DSSS) signals. To ensure acceptable detection probabilities, the frequency space has to be finely divided, which leads to complicated acquisition structures and excessively long acquisition time at low SNR. A local frequency folding (LFF) method designed for combined application with established techniques dedicated to PN-code synchronization is proposed in this paper. Through modulating local PN-code block with a fixed waveform obtained by folding all frequency cells together, we eliminate the need for frequency search and ease the workload of acquisition. We also analyze the performance of LFF and find that the detection performance degradation from folding can be compensated by FFT-based coherent integration. The study is complemented with numerical simulations showing that the proposed method has advantages over unfolding methods with respect to detection probability and mean acquisition time, and the advantage becomes obvious but limited if the folded number gets larger.
ER -