| Presentation | 2004-06-18 Time Diversity Effect in Hybrid ARQ Considering Space and Path Diversity for VSF-OFCDM Broadband Wireless Access in Forward Link Nobuhiko Miki, Kenichi Higuchi, Hiroyuki Atarashi, Mamoru Sawahashi, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This paper investigates the effect of time diversity derived from hybrid automatic repeat request (ARQ) with packet combining considering space and path diversity schemes on Variable Spreading Factor (VSF)-Orthogonal Frequency and Code Division Multiplexing (OFCDM) packet wireless access in a forwardlink broadband multipath fading channel by laboratory and field experiments. The experimental results show that, for a fixed modulation and channel coding scheme (MCS), time diversity by hybrid ARQ is effective in improving the required received signal-to-interference plus noise power ratio (SINK) according to an increase in the number of transmissions, M, up to 10, even when the diversity effects are obtained through two-branch antenna diversity reception and path diversity by a number of multipaths greater than 12 observed in real fading channel. Meanwhile, in combined use with the adaptive modulation and channel coding (AMC) scheme associated with space and path diversity, we clarify that the gain derived through time diversity is almost saturated at M=4 in Chase combining and M=2 in Incremental redundancy, since the improvement in the residual packet error rate (PER) obtained through time diversity becomes small owing to the low PER in the initial packet transmission arising from appropriately selecting the optimum MCS in AMC. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | broadband packet wireless access / hybrid ARQ / time diversity / space diversity / path diversity |
| Paper # | RCS2004-79 |
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| Committee | RCS |
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| Conference Date | 2004/6/11(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) | Time Diversity Effect in Hybrid ARQ Considering Space and Path Diversity for VSF-OFCDM Broadband Wireless Access in Forward Link |
| Sub Title (in English) | |
| Keyword(1) | broadband packet wireless access |
| Keyword(2) | hybrid ARQ |
| Keyword(3) | time diversity |
| Keyword(4) | space diversity |
| Keyword(5) | path diversity |
| 1st Author's Name | Nobuhiko Miki |
| 1st Author's Affiliation | IP Radio Network Development Department, NTT DoCoMo, Inc.() |
| 2nd Author's Name | Kenichi Higuchi |
| 2nd Author's Affiliation | IP Radio Network Development Department, NTT DoCoMo, Inc. |
| 3rd Author's Name | Hiroyuki Atarashi |
| 3rd Author's Affiliation | IP Radio Network Development Department, NTT DoCoMo, Inc. |
| 4th Author's Name | Mamoru Sawahashi |
| 4th Author's Affiliation | IP Radio Network Development Department, NTT DoCoMo, Inc. |
| Date | 2004-06-18 |
| Paper # | RCS2004-79 |
| Volume (vol) | vol.104 |
| Number (no) | 123 |
| Page | pp.pp.- |
| #Pages | 6 |
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