2010 Fiscal Year Final Research Report
Realization of low power consumption wireless node using joint RF and baseband signal processing technique
| Project/Area Number |
20360172
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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, 情報科学研究科, 教授 (10252587)
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| Co-Investigator(Kenkyū-buntansha) |
HARA Takao 奈良先端科学技術大学院大学, 情報科学研究科, 准教授 (30372668)
SAITO Masato 琉球大学, 工学部, 准教授 (30335476)
MIYAMOTO Ryusuke 奈良先端科学技術大学院大学, 情報科学研究科, 助教 (10452525)
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| Project Period (FY) |
2008 – 2010
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| Keywords | RF信号処理 / ベースバンド / 低消費電力 / 無線ノード / Zig-Bee / W-LAN / ESPARアンテナ |
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| Research Abstract |
This research reveils a single-RF diversity scheme for spread spectrum receiver based on IEEE 802.15.4 standard. The proposed scheme employs an Electronically Steerable Passive Array Radiator (ESPAR) antenna with periodically changing directivity at the symbol rate. IEEE 802.15.4 focuses on low power consumption short range communication systems. However, the bit error rate performance is not good enough in a severe multipath fading environment. Diversity is a well-known technique to compensate for the performance degradation due to multipath fading. However, the complexity for diversity reception is a major problem. In this paper, we propose a new single-RF diversity scheme using ESPAR antenna with periodically changing directivity. The proposed scheme is capable of obtaining the diversity gain in a frequency selective fading environment and it solves the slow convergence rate problem in the conventional ESPAR antenna based diversity scheme. Computer simulation result and theoretical analysis show that the proposed scheme gives diversity gain.
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