Fast Acquisition of High Dynamic DSSS Signals: Design and FPGA Implementation

To solve contradictions between acquisition speed and resource consumption of high dynamic direct-sequence spread spectrum (DSSS) signals, this paper analyzes the performance of PMF-FFT(Part of the Matched Filtering combined with Fast Fourier Transform) method. For the disadvantage that this method...

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Bibliographic Details
Published in:Dianxun Jishu / Telecommunications Engineering 2014-05, Vol.54 (5), p.547-552
Main Authors: He, Pan-Feng, Cheng, Nai-Ping, Ding, Dan, Cui, Jian-Hua
Format: Article
Language:Chinese
Subjects:
Acquisitions
Dynamics
Field programmable gate arrays
Filtering
Hardware
Marketing
Matched filters
Spreads
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Summary:To solve contradictions between acquisition speed and resource consumption of high dynamic direct-sequence spread spectrum (DSSS) signals, this paper analyzes the performance of PMF-FFT(Part of the Matched Filtering combined with Fast Fourier Transform) method. For the disadvantage that this method has limited scope of frequency acquisition and high hardware resource consumption, this paper replaces conventional matched filter by recursive and folded matched filter, resulting in saving hardware resources largely. Parallel FFT is used for ensuring the speed of acquisition. Frequency sweeping to extend scope of the frequency deviation is adopoted. The structure and FPGA implementation are discussed and the result proves the effectiveness of the proposed method. Compared with the FFT circular convolution method in certain capture range offset, the proposed method has faster acquisition speed, less resource consumption, which is well-suited for fast acquisition of high dynamic DSSS signals.
ISSN:1001-893X
DOI:10.3969/j.issn.1001-893x.2014.05.004