2004 Fiscal Year Final Research Report Summary
The analyses on indoor wireless environments and the transmission performance of giga-bit wireless LAN
| Project/Area Number |
15560342
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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 |
Communication/Network engineering
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| Research Institution | Kyoto Sangyo University |
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Principal Investigator |
TAKEUCHI Tsutomu Kyoto Sangyo University, Faculty of Engineering, Professor, 工学部, 教授 (20154974)
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| Co-Investigator(Kenkyū-buntansha) |
ZHOU Hong Osaka Institute of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (80268226)
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| Project Period (FY) |
2003 – 2004
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| Keywords | wireless LAN / UWB / channel sounder / multipath propagation / OFDM / mobile communication / giga-bit |
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| Research Abstract |
This research work has been done for the realization of Giga-bit/s wireless LAN by both analyses on wireless propagation and communication system. Following results were obtained.
1. Indoor wireless propagation measurements and wireless LAN simulator
Indoor wireless propagation measurements have been done by using the ultra wide-band channel sounder with newly added DOA measuring function. It found many strong specular rays caused by the metallic objects and so many weak scattering rays. By utilizing the measured delay profiles, the indoor propagation channel simulator has been studied and used for the performance investigation of MIMO diversity system. The diversity system showed the performance improvement even in the static environment.
2. Studies on Giga-bit/s communication system for wireless LAN
A simple channel performance estimation method based on the viterbi decoding metrics has been proposed and evaluated by computer simulations with the valuable results. Based on this new chann
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el estimation method, two basic adaptive rate communication systems have been studied. The first one with adaptive modulation schemes has realized a fast average transmission rate with complex hardware architecture, however, the second one with adaptive frequency diversity branch number system has obtained a relatively small scale hardware with small loss of performance.
In the next, a high-precision time-delay difference estimation method based on the in-phase channel distortion detector has been proposed and studied. And its application to the adaptive variable guard-interval (GI) OFDM system has been studied. The simulation result showed that the system has realized the high transmission performance and efficiency compared with conventional fixed GI system.
And furthermore, a MEMO-OFDM system utilizing the sub-carrier channel orthogonal property has been studied to show its system simplicity and the comparable transmission performance compared with conventional space-time coding MIMO system. The proposed system is expected to cut the power consumption in big amount. Less
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Research Products
(11 results)
