| Presentation | 2015-06-25 Suppression of Multiple Interferences for Superposed Multicarrier Transmission Yuto Kakizaki, Yohei Shibata, Tomoaki Ohtsuki, Jun Mashino, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Superposed multicarrier transmission is proposed as one of the schemes that improve frequency utilization efficiency. In this scheme some wireless systems share the same spectrum, and interference suppression is necessary. One conventional scheme for the interference suppression applies the EM (Expectation Maximization) algorithm for the estimation of interference parameters, and another scheme iterates the estimation of the parameters based on undesired signal power. However, these schemes assume the same average power for all interferences, which makes accuracy of the estimated power lower and results in degradation of BER (Bit Error Rate) when the average power of each interference is not same. In this report, we propose a suppression schemes for multiple interferences with different average power levels. In our scheme, undesired signal power is averaged in both time and frequency domains, after which it is compared to threshold to determine if the corresponding subcarrier is superposed or not. According to the result of this comparison, the power of each interference is estimated. Furthermore, the threshold is iteratively recalculated when the estimated parameters are updated. Through computer simulations, we show that the proposed scheme taking the different average power of interference into account shows better BER performance than that of conventional ones assuming the same average power of interference. In addition, we show that averaging undesired signal power in both time and frequency domains and iterative calculation of threshold lead to improvement of the accuracy of superposed band detection. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | superposed multicarrier transmission / LLR / averaging in the frequency domain |
| Paper # | RCS2015-59 |
| Date of Issue | 2015-06-17 (RCS) |
| Conference Information | |
| Committee | RCS |
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| Conference Date | 2015/6/24(3days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Hokkaido Univ. |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | First Presentation in IEICE Technical Committee, Railroad Communications, Inter-Vehicle Communications, Road to Vehicle Communications, Resource Control, Scheduling, Wireless Communication Systems, etc. |
| Chair | Makoto Taromaru(Fukuoka Univ.) |
| Vice Chair | Hidekazu Murata(Kyoto Univ.) / Satoshi Denno(Okayama Univ.) / Yukitoshi Sanada(Keio Univ.) |
| Secretary | Hidekazu Murata(Mitsubishi Electric) / Satoshi Denno(NTT DoCoMo) / Yukitoshi Sanada |
| Assistant | Jun Mashino(NTT) / Tetsuya Yamamoto(Panasonic) / Takamichi Inoue(NEC) / Tomoya Tandai(Toshiba) / Toshihiko Nishimura(Hokkaido Univ.) |
| Paper Information | |
| Registration To | Technical Committee on Radio Communication Systems |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Suppression of Multiple Interferences for Superposed Multicarrier Transmission |
| Sub Title (in English) | |
| Keyword(1) | superposed multicarrier transmission |
| Keyword(2) | LLR |
| Keyword(3) | averaging in the frequency domain |
| 1st Author's Name | Yuto Kakizaki |
| 1st Author's Affiliation | Keio University(Keio Univ.) |
| 2nd Author's Name | Yohei Shibata |
| 2nd Author's Affiliation | Keio University(Keio Univ.) |
| 3rd Author's Name | Tomoaki Ohtsuki |
| 3rd Author's Affiliation | Keio University(Keio Univ.) |
| 4th Author's Name | Jun Mashino |
| 4th Author's Affiliation | Nippon Telegraph and Telephone Corporation(NTT) |
| Date | 2015-06-25 |
| Paper # | RCS2015-59 |
| Volume (vol) | vol.115 |
| Number (no) | RCS-113 |
| Page | pp.pp.77-82(RCS), |
| #Pages | 6 |
| Date of Issue | 2015-06-17 (RCS) |