| Presentation | 1999/8/27 Development of Coherent Demodulation QPSK FH-SS System Using with Digital PLL Symbol Synchronization Circuit Satoru lshii, Atsushi Hoshikuki, Ryuji Kohno, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | The QPSK modulation scheme is implemented to the newly developed FH-SS communication system. The delay demodulation is mainly used for the mobile application, however, this system employs both the coherent demodulation and the delay demodulation operating alternatively. With the Viterbi decoding, the system achieve very high reliability for the industrial application. In the employment of the QPSK modulation to the FH-SS system, it is impossible to enable the fast QPSK symbol synchronization in the coherent detection with the conventional scheme. To solve this problem, the symbol synchronization is taken directly without any carrier extraction. Also the DPLL symbol synchronization circuit, presenting in this paper, is developed for the FH-SS application. Designing of the prototype system is completed, operation tests and performance evaluations are undergoing now. After some improvement, this system will be in the market. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Spread Spectrum / Wireless Modem / Symbol Synchronization / Coherent Demodulation / Carrier Extraction / Digital PLL |
| Paper # | RCS99-87 |
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| Conference Information | |
| Committee | RCS |
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| Conference Date | 1999/8/27(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
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| Vice Chair | |
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| Paper Information | |
| Registration To | Radio Communication Systems (RCS) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Development of Coherent Demodulation QPSK FH-SS System Using with Digital PLL Symbol Synchronization Circuit |
| Sub Title (in English) | |
| Keyword(1) | Spread Spectrum |
| Keyword(2) | Wireless Modem |
| Keyword(3) | Symbol Synchronization |
| Keyword(4) | Coherent Demodulation |
| Keyword(5) | Carrier Extraction |
| Keyword(6) | Digital PLL |
| 1st Author's Name | Satoru lshii |
| 1st Author's Affiliation | Radio Control Equipment Group, Futaba Corporation() |
| 2nd Author's Name | Atsushi Hoshikuki |
| 2nd Author's Affiliation | Radio Control Equipment Group, Futaba Corporation |
| 3rd Author's Name | Ryuji Kohno |
| 3rd Author's Affiliation | Div.of Elec. & Comp. Eng., Faculty of Eng., Yokohama National University |
| Date | 1999/8/27 |
| Paper # | RCS99-87 |
| Volume (vol) | vol.99 |
| Number (no) | 272 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |