| Presentation | 2014/3/3 Fading Characteristics in the SHF Band Indoor Quasi-static Environment Kentaro SAITO, Tetsuro IMAI, Ngochao Tran, Yukihiko OKUMURA, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | The user traffic volume in the cellular network has been growing rapidly due to the spreads of smart phones and various application services and it is predicted that the traffic volume will grow by 500-1000 times in the next decade. Recently, the challenges that utilize higher frequency bands such as the upper Super High Frequency (SHF) band and the Extremely High Frequency (EHF) band as the cellular system are investigated. However, in the higher frequency bands, besides the higher propagation losses, the wavelength of carrier wave becomes shorter and the propagation channel is inclined to suffer from more severe shadowing by pedestrians in the environments. Especially in the crowded environments such as the indoor and the outdoor hotspot environment, the impact of shadowing caused by pedestrians will be more significant. In addition although the MIMO transmission techniques that achieve the high gain communications using the beamforming methods have been investigated to mitigating the high propagation losses in the high frequency bands, the shadowing and the fading characteristics has not been figured out in the case that directional antenna pattern is applied. In this paper, we carried out the path loss measurement in the 26 GHz band quasi-static indoor environment for figuring out the propagation issues in the upper SHF band. The measurement result showed that the severe shadowing and the fading were caused by pedestrians in the 26 GHz band comparing with the measurement in the 2GHz band. The mean received power decreased about 1 dB and the K factor of fading was 6 dB in the case of 5 pedestrians in the room. The correlation time of autocorrelation of fading was 0.13 sec. that almost corresponded to the measurement in the 2GHz band. In the case that the directional antenna is used in BS side, although the received power variation caused by pedestrians became smaller, the severe shadowing was occasionally occurred due to the blocking of directly propagated path. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Upper SHF band / Indoor propagation / Quasi-static environment / Human body shadowing / Fading characteristics |
| Paper # | A・P2013-201 |
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| Conference Information | |
| Committee | AP |
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| Conference Date | 2014/3/3(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Antennas and Propagation (A・P) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Fading Characteristics in the SHF Band Indoor Quasi-static Environment |
| Sub Title (in English) | |
| Keyword(1) | Upper SHF band |
| Keyword(2) | Indoor propagation |
| Keyword(3) | Quasi-static environment |
| Keyword(4) | Human body shadowing |
| Keyword(5) | Fading characteristics |
| 1st Author's Name | Kentaro SAITO |
| 1st Author's Affiliation | NTT DOCOMO, INC.() |
| 2nd Author's Name | Tetsuro IMAI |
| 2nd Author's Affiliation | NTT DOCOMO, INC. |
| 3rd Author's Name | Ngochao Tran |
| 3rd Author's Affiliation | NTT DOCOMO, INC. |
| 4th Author's Name | Yukihiko OKUMURA |
| 4th Author's Affiliation | NTT DOCOMO, INC. |
| Date | 2014/3/3 |
| Paper # | A・P2013-201 |
| Volume (vol) | vol.113 |
| Number (no) | 487 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |