Acquisition of a Spread Spectrum Signal with Frequency Offset
| Project/Area Number |
07805037
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
情報通信工学
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| Research Institution | Nagoya University |
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Principal Investigator |
KATAYAMA Masaaki Nagoya University, School of Engineering, Associate Professor., 工学部, 助教授 (60185816)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1996: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1995: ¥1,100,000 (Direct Cost: ¥1,100,000)
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| Keywords | Low Earth-Orbital Satellite System / Spread Spectrum Sommunication / Carrier Frequency Offset / Acquisition of a Spreading Sequence / Estimation of the Carrier Frequency / FFT / Divided Matched Filter / Signal Processing / スペクトル拡散通信システム / 高速同期捕捉 / M値スペクトル拡散通信方式 |
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| Research Abstract |
In this research, initial acquisition of a Spread Spectrum (SS) signal under large frequency offset is investigated. The following two schemes are proposed and evaluated. The schemes and main results are as follows.
1.Divide Matched Filter Method
In this method, the spreading sequence is divied into a set of sub-sequences and a bank of matched filters, which are corresponding to the sub-sequences, are prepared in the initial acquisition circuit. The circuit then stores the output of the matched filters, and by searching the outputs, it finds the timing, or the phase, of the spreading sequence of the received signal. The results of performance evaluation show that this proposed scheme outperform conventional scheme with a non-divided filter in mean acquisition time under large frequency offset.
2. Frequency-Time Domains Method
When the frequency offset is very large, even the scheme proposed above can not provide quick synchronization. For this condition, the employment of a set of FFT after the bank of spreading codes with different time-offset is proposed. In this method, the frequency and timing of the received SS signal at the same time. As the results, the advantage of this scheme is shown with the selection of some parameters.
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Report
(3 results)
Research Products
(16 results)
