| Paper Abstract and Keywords |
| Presentation |
2005-08-25 15:30
Investigations on Optimum Guard Interval Length in Uniast Channel for OFDM Radio Access in Evolved UTRA Downlink
Taisuke Ihara, Hiroyuki Atarashi, Akihito Morimoto, Yoshihisa Kishiyama, Kenichi Higuchi, Mamoru Sawahashi (NTT DoCoMo) |
| Abstract |
(in Japanese) |
(See Japanese page) |
| (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 formula from the calculated received SINR as a function of CP length.
Simulation results shows that, the optimum guard interval length is approximately 3 usec in a multi-cell environment suffering from large inter-cell interference.
Meanwhile, in an isolated-cell interference assuming no inter-cell interference, the optimum guard interval length becomes approximately 3 – 5 usec. 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 1 usec.
Therefore, the required CP length becomes approximately 4 and 4 – 6 usec for multi-cell and isolated-cell environments, respectively, and then, we conclude the optimum CP length is approximately 5 usec. |
| Keyword |
(in Japanese) |
(See Japanese page) |
| (in English) |
Evolved UTRA / OFDM / unicast / guard interval length / / / / |
| Reference Info. |
IEICE Tech. Rep., vol. 105, no. 240, RCS2005-70, pp. 37-42, Aug. 2005. |
| Paper # |
RCS2005-70 |
| Date of Issue |
2005-08-18 (RCS) |
| ISSN |
Print edition: ISSN 0913-5685 |
| Download PDF |
|
| Conference Information |
| Committee |
RCS CS |
| Conference Date |
2005-08-25 - 2005-08-26 |
| Place (in Japanese) |
(See Japanese page) |
| Place (in English) |
Tokyo Inst. Tech. |
| Topics (in Japanese) |
(See Japanese page) |
| Topics (in English) |
Broadband Wireless Access, Radio communication |
| Paper Information |
| Registration To |
RCS |
| Conference Code |
2005-08-RCS-CS |
| Language |
Japanese |
| Title (in Japanese) |
(See Japanese page) |
| Sub Title (in Japanese) |
(See Japanese page) |
| Title (in English) |
Investigations on Optimum Guard Interval Length in Uniast Channel for OFDM Radio Access in Evolved UTRA Downlink |
| Sub Title (in English) |
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| Keyword(1) |
Evolved UTRA |
| Keyword(2) |
OFDM |
| Keyword(3) |
unicast |
| Keyword(4) |
guard interval length |
| Keyword(5) |
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| Keyword(6) |
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| Keyword(7) |
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| Keyword(8) |
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| 1st Author's Name |
Taisuke Ihara |
| 1st Author's Affiliation |
NTT DoCoMo, Inc. (NTT DoCoMo) |
| 2nd Author's Name |
Hiroyuki Atarashi |
| 2nd Author's Affiliation |
NTT DoCoMo, Inc. (NTT DoCoMo) |
| 3rd Author's Name |
Akihito Morimoto |
| 3rd Author's Affiliation |
NTT DoCoMo, Inc. (NTT DoCoMo) |
| 4th Author's Name |
Yoshihisa Kishiyama |
| 4th Author's Affiliation |
NTT DoCoMo, Inc. (NTT DoCoMo) |
| 5th Author's Name |
Kenichi Higuchi |
| 5th Author's Affiliation |
NTT DoCoMo, Inc. (NTT DoCoMo) |
| 6th Author's Name |
Mamoru Sawahashi |
| 6th Author's Affiliation |
NTT DoCoMo, Inc. (NTT DoCoMo) |
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| Speaker |
Author-1 |
| Date Time |
2005-08-25 15:30:00 |
| Presentation Time |
20 minutes |
| Registration for |
RCS |
| Paper # |
RCS2005-70 |
| Volume (vol) |
vol.105 |
| Number (no) |
no.240 |
| Page |
pp.37-42 |
| #Pages |
6 |
| Date of Issue |
2005-08-18 (RCS) |
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