| Presentation | 2005-07-21 Throughput Performance of MC-CDMA HARQ with Adaptive Variable Spreading Factor Shinsuke TAKAOKA, Fumiyuki ADACHI, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Next generation mobile communications systems require high-speed and high-quality packet transmission. MC-CDMA is considered to be a promising wireless access technique. An automatic repeat request (ARQ) combining with the forward error correction (FEC), called hybrid ARQ (HARQ), is a important technique for wireless packet transmission. This paper proposes a multi-carrier code division multiple access (MC-CDMA) HARQ with adaptive variable spreading factor to improve the throughput performance. In the proposed scheme, spreading factor is changed according to the number of retransmissions for effectively obtaining both the frequency diversity gain and the coding gain. The throughput performance of the proposed scheme in a frequency-selective Rayleigh fading channel is evaluated by the computer simulation and is compared with that of the conventional MC-CDMA HARQ that uses fixed spreading factor regardless of the number of retransmission. Simulation results show that the proposed scheme provides better throughput performance than the conventional one and is useful particularly when high-level modulation (e.g., 16QAM and 64QAM) is used. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | MC-CDMA / HARQ / Spreading factor / Frequency diversity / Coding gain |
| Paper # | RCS2005-43 |
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| Conference Information | |
| Committee | RCS |
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| Conference Date | 2005/7/14(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) | Throughput Performance of MC-CDMA HARQ with Adaptive Variable Spreading Factor |
| Sub Title (in English) | |
| Keyword(1) | MC-CDMA |
| Keyword(2) | HARQ |
| Keyword(3) | Spreading factor |
| Keyword(4) | Frequency diversity |
| Keyword(5) | Coding gain |
| 1st Author's Name | Shinsuke TAKAOKA |
| 1st Author's Affiliation | Department of Electrical and Communication Engineering, Graduate School of Engineering, Tohoku University() |
| 2nd Author's Name | Fumiyuki ADACHI |
| 2nd Author's Affiliation | Department of Electrical and Communication Engineering, Graduate School of Engineering, Tohoku University |
| Date | 2005-07-21 |
| Paper # | RCS2005-43 |
| Volume (vol) | vol.105 |
| Number (no) | 196 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |