2014 Fiscal Year Final Research Report
Study on highly efficient satellite communications system
| Project/Area Number |
24560480
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Communication/Network engineering
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| Research Institution | Nihon University |
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Principal Investigator |
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| Research Collaborator |
TIBINAI Masayuki
WATANABE Tasuku
OHKUBO Takahiro
YAMAGUCHI Daiki
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| Project Period (FY) |
2012-04-01 – 2015-03-31
|
| Keywords | 衛星通信 / 空間重畳合成 / 多値変調 / 電力増幅器 / アンテナ / 32APSK / 64QAM / 省エネルギ |
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| Outline of Final Research Achievements |
Highly efficient 32 amplitude-phase shift keying (32APSK) and 64 quadrature amplitude shift keying (64QAM) modulation satellite broadband communication systems were proposed.
They feature a compact two-beam spatial superposition that improves the usage efficiency of the frequency resources and energy. The 32APSK system incorporates an eight phase-shift keying (8PSK) modulator, a quadrature phase-shift keying (QPSK) modulator, and multiple high power amplifiers (HPAs) that operate in their nonlinear region at a high level of efficiency. Their output signals are spatially combined using a specially tailored antenna array to produce a new 32APSK signal.
An experimental test demonstrated the validity of the spatial superposition. The HPA power consumption was reduced about 50% compared with that of the conventional system. The proposed compact system is feasible and will enable broadband transmission while using the available amount of energy and bandwidth more efficiently.
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| Free Research Field |
衛星通信工学
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