| Presentation | 2008-03-05 Throughput Performance of Random-Access Wireless System with Pre-FFT Type MMSE Adaptive Array Antenna Kazuto YANO, Ikuo HIRADATE, Satoshi TSUKAMOTO, Makoto TAROMARU, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Both increasing the chances of frame transmission by raising carrier sense level and the suppressing asynchronous interference signals are the requirements for a significant enhancement of the area-spectral efficiency of random-access wireless systems based on CSMA/CA. Recently, the authors have proposed a pre-FFT type MMSE adaptive array antenna with iterative weight update for OFDM systems in order to suppress asynchronous interference effectively. They have also constructed a multi-node link-level simulation tool based on the IEEE 802.11g ERP-OFDM system in order to evaluate the area-spectral efficiency of the random-access wireless system. It includes basic MAC layer processes of the DCF mode and a method of generating multipath channels among multiple nodes using 2-D raytracing simulations considering only transmission and reflection at walls. In this paper, the area-spectral efficiency enhancement of a random-access wireless system is evaluated through computer simulations assuming an indoor environment in which there is an LOS path only between nodes communicating each other. Simulation results show that a significant enhancement of the area-spectral efficiency can be achieved by disabling carrier sensing processes. It is also revealed that both a further enhancement of the area-spectral efficiency and an improvement of fairness can be brought by introducing the proposed adaptive array antenna to all nodes if a high transmission datarate is used. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | pre-FFT type adaptive array antenna / area-spectral efficiency / random access system / IEEE 802.11g / indoor environment / OFDM |
| Paper # | RCS2007-199 |
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| Committee | RCS |
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| Conference Date | 2008/2/27(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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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) | Throughput Performance of Random-Access Wireless System with Pre-FFT Type MMSE Adaptive Array Antenna |
| Sub Title (in English) | |
| Keyword(1) | pre-FFT type adaptive array antenna |
| Keyword(2) | area-spectral efficiency |
| Keyword(3) | random access system |
| Keyword(4) | IEEE 802.11g |
| Keyword(5) | indoor environment |
| Keyword(6) | OFDM |
| 1st Author's Name | Kazuto YANO |
| 1st Author's Affiliation | ATR Wave Engineering Laboratories() |
| 2nd Author's Name | Ikuo HIRADATE |
| 2nd Author's Affiliation | ATR Wave Engineering Laboratories |
| 3rd Author's Name | Satoshi TSUKAMOTO |
| 3rd Author's Affiliation | ATR Wave Engineering Laboratories |
| 4th Author's Name | Makoto TAROMARU |
| 4th Author's Affiliation | ATR Wave Engineering Laboratories |
| Date | 2008-03-05 |
| Paper # | RCS2007-199 |
| Volume (vol) | vol.107 |
| Number (no) | 518 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |