| Presentation | 2011-08-25 Interference Detection Based on Error Probability Using Initial Likelihood Masking Tomoaki OHTSUKI, Jun MASHINO, Takatoshi SUGIYAMA, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Superposed multicarrier transmission scheme is known to improve frequency utilization efficiency where several systems share spectrum without any spectrum spreading techniques. In superposed multicarrier transmission scheme froward error correction (FEC) coding is applied over subcarriers so that the effects of interference caused by superposition is mitigated by interleaving effects. When the interference power is large, the effects of FEC become smaller particularly owing to the mis-setting of initial log likelihood ratio (LLR). To solve this problem, FEC metric masking is proposed where initial LLRs for overlapping subcarriers are replaced by neutral value in the receiver followed by decoding. This technique is effective, however, it needs the information about overlapping frequency band. In this report we propose a scheme to detect overlapping band by using FEC metric masking. In the proposed scheme, the subcarriers where FEC metric masking is applied are changed and symbol error rate is measured. When the FEC metric masking is applied to the overlapping subcarriers, symbol error rate is minimized. Based on the change of symbol error rate, we can detect the overlapping band. We evaluate the proposed scheme by computer simulation and show that it can detect the overlapping band with high probability. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Superposed multicarrier transmission / Initial likelihood masking / Overlapping band |
| Paper # | SAT2011-24,RCS2011-119 |
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| Conference Information | |
| Committee | SAT |
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| Conference Date | 2011/8/18(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| Registration To | Satellite Telecommunications (SAT) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Interference Detection Based on Error Probability Using Initial Likelihood Masking |
| Sub Title (in English) | |
| Keyword(1) | Superposed multicarrier transmission |
| Keyword(2) | Initial likelihood masking |
| Keyword(3) | Overlapping band |
| 1st Author's Name | Tomoaki OHTSUKI |
| 1st Author's Affiliation | Department of Computer and Information Science Keio University() |
| 2nd Author's Name | Jun MASHINO |
| 2nd Author's Affiliation | NTT Access Network Service Systems Laboratories |
| 3rd Author's Name | Takatoshi SUGIYAMA |
| 3rd Author's Affiliation | NTT Access Network Service Systems Laboratories |
| Date | 2011-08-25 |
| Paper # | SAT2011-24,RCS2011-119 |
| Volume (vol) | vol.111 |
| Number (no) | 179 |
| Page | pp.pp.- |
| #Pages | 5 |
| Date of Issue | |