| Project/Area Number |
17360181
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Communication/Network engineering
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| Research Institution | Nara Institute of Science and Technology |
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Principal Investigator |
OKADA Minoru Nara Institute of Science and Technology, Graduate School of Information Science, Professor, 情報科学研究科, 教授 (10252587)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAMOTO Heiichi Nara Institute of Science and Technology, Vice President, 副学長 (40243357)
SAITO Masato Nara Institute of Science and Technology, Graduate School of Information Science, Assistant Professor, 情報科学研究科, 助手 (30335476)
KAWAI Eiji Nara Institute of Science and Technology, Graduate School of Information Science, Associate Professor, 情報科学研究科, 助教授 (40362842)
原 孝雄 奈良先端科学技術大学院大学, 情報科学研究科, 助手 (30372668)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥13,100,000 (Direct Cost: ¥13,100,000)
Fiscal Year 2006: ¥5,200,000 (Direct Cost: ¥5,200,000)
Fiscal Year 2005: ¥7,900,000 (Direct Cost: ¥7,900,000)
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| Keywords | OFDM / Handheld Terminal / Digital Broadcasting / One-Segment DTTB / ISDB-T / Mixed Signal Processing / Multipath Fading / Diversity / デジタル放送 / マルチパス |
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| Research Abstract |
Although OFDM (Orthogonal Frequency Division Multiplex) is an efficient technique capable of reducing the performance degradation due to delay spreading in multipath environment and employed as a transmission technique for terrestrial digital television broadcasting and wireless LAN (local area network), it is not capable of improving the degradation due to fading. Recently, digital terrestrial television broadcasting for handheld terminals based on OFDM has been introduced in Japan. However, the power consumption of the receiver becomes a problem. The RF (radio frequency) front-end component of the receiver requires low noise figure (NF) linear amplifier. Generally speaking, it requires high power consumption amplifier to reduce the NF. Furthermore, the baseband signal processing block including FFT processors requires huge computational cost. That is, it is difficult to reduce the power consumption in principle.
In order to reduce the power consumption of the OFDM receiver, this research project has proposed an adaptive mixed signal processing, where the RF signal processing component including low NF amplifier is adaptively controlled its power consumption according to the channel condition. When the channel condition is good, the amplifier at the RF front-end is operated in low power mode, while it is switched to low NF mode if the channel condition becomes worse. In order to measure the channel condition, the baseband block measures the signal-to-noise ratios (SNR) of each OFDM sub-channel and estimates the instantaneous bit error rate from the measured SNRs.
In this project, we have confirmed that the proposed mixed signal processing receiver is capable of reducing power consumption.
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