| Presentation | 2005-08-25 Investigations on Optimum Cyclic Prefix Length in Unicast Channel for OFDM Radio Access in Evolved UTRA Downlink Taisuke Ihara, Hiroyuki Atarashi, Akihito Morimoto, Yoshihisa Kishiyama, Kenichi Higuchi, Mamoru Sawahashi, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This paper investigates the optimum guard interval length using cyclic prefix (CP) in Unicast channel for OFDM radio access in Evolved UTRA downlink considering both the multi-cell and isolated-cell environments. In the evaluation, by employing delay spread, which is calculated based on the model in [6], the average received signal-to-interference plus noise power ratio (SINR) considering the Inter-Symbol Interference (ISI) and Inter-Carrier Interference (ICI) is calculated. Then, the user throughput is derived through the modified Shannon capacity from the calculated received SINR as a function of CP length. Simulation results shows that, the optimum CP length is approximately 3μsec in a multi-cell environment suffering from large inter-cell interference. Meanwhile, in an isolated-cell interference assuming no inter-cell interference, the optimum CP length becomes approximately 3-5μsec. Furthermore, when we take into account the path timing detection error, and if we apply the techniques, such as time windowing for reducing out-of-band emissions and the RF combining of the same data channels transmitted from the same or multiple sectors, it is advantageous to prepare additional margin of approximately 1μsec. Therefore, the required CP length becomes approximately 4 and 4-6μsec for multi-cell and isolated-cell environments, respectively, and then, we conclude the optimum CP length is approximately 5μsec. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Evolved UTRA / OFDM / Unicast channel / Cyclic Prefix / Guard interval |
| Paper # | RCS2005-70 |
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| Conference Information | |
| Committee | RCS |
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| Conference Date | 2005/8/18(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| 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) | Investigations on Optimum Cyclic Prefix Length in Unicast Channel for OFDM Radio Access in Evolved UTRA Downlink |
| Sub Title (in English) | |
| Keyword(1) | Evolved UTRA |
| Keyword(2) | OFDM |
| Keyword(3) | Unicast channel |
| Keyword(4) | Cyclic Prefix |
| Keyword(5) | Guard interval |
| 1st Author's Name | Taisuke Ihara |
| 1st Author's Affiliation | IP Radio Network Development Department, NTT DoCoMo, Inc.() |
| 2nd Author's Name | Hiroyuki Atarashi |
| 2nd Author's Affiliation | IP Radio Network Development Department, NTT DoCoMo, Inc. |
| 3rd Author's Name | Akihito Morimoto |
| 3rd Author's Affiliation | IP Radio Network Development Department, NTT DoCoMo, Inc. |
| 4th Author's Name | Yoshihisa Kishiyama |
| 4th Author's Affiliation | IP Radio Network Development Department, NTT DoCoMo, Inc. |
| 5th Author's Name | Kenichi Higuchi |
| 5th Author's Affiliation | IP Radio Network Development Department, NTT DoCoMo, Inc. |
| 6th Author's Name | Mamoru Sawahashi |
| 6th Author's Affiliation | IP Radio Network Development Department, NTT DoCoMo, Inc. |
| Date | 2005-08-25 |
| Paper # | RCS2005-70 |
| Volume (vol) | vol.105 |
| Number (no) | 240 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |