| Presentation | 2009-08-04 Performance Evaluation of Spreading Code Sequences Appropriate for Maximum Likelihood Detection in MC-CDMA with Channel Coding Akira Wakamiya, Kenichi Higuchi, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This paper investigates the spreading code sequences appropriate for the multicarrier code division multiple access (MC-CDMA) assuming the maximum likelihood detection (MLD) at the receiver. The conventional Walsh code sequence-based spreading code does not allow for exploitation of full diversity using MLD due to the zero product codeword distance. Therefore, we have proposed two spreading codes named a rotational Walsh code which is generated by applying phase rotation to the conventional Walsh code sequence and quadrature amplitude modulation (QAM) code whose constellation after spreading and code-multiplexing takes QAM-like shape. By designing the spreading code so that the minimum squared product codeword distance becomes larger than zero, these proposed codes achieve full frequency diversity. Without channel coding, we have shown that the rotational Walsh code achieves better bit error rate (BER) than the QAM code due to the larger minimum squared product codeword distance. However, we show in the paper that in channel coded case, the QAM code chieves better BER than the rotational Walsh code thanks to the larger average squared product codeword distance. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | MC-CDMA / Spreading code / Maximum likelihood detection / Diversity / Channel coding |
| Paper # | RCS2009-107 |
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| Conference Information | |
| Committee | RCS |
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| Conference Date | 2009/7/27(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| 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) | Performance Evaluation of Spreading Code Sequences Appropriate for Maximum Likelihood Detection in MC-CDMA with Channel Coding |
| Sub Title (in English) | |
| Keyword(1) | MC-CDMA |
| Keyword(2) | Spreading code |
| Keyword(3) | Maximum likelihood detection |
| Keyword(4) | Diversity |
| Keyword(5) | Channel coding |
| 1st Author's Name | Akira Wakamiya |
| 1st Author's Affiliation | Department of Electrical Engineering, Graduate School of Science and Technology Tokyo University of Science() |
| 2nd Author's Name | Kenichi Higuchi |
| 2nd Author's Affiliation | Department of Electrical Engineering, Graduate School of Science and Technology Tokyo University of Science |
| Date | 2009-08-04 |
| Paper # | RCS2009-107 |
| Volume (vol) | vol.109 |
| Number (no) | 164 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |