| Presentation | 2009-03-09 Sum-Product Decoding of 3GPP Turbo Code Toru ANZAI, Toshiyuki SHOHON, Haruo OGIWARA, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Turbo code has been adopted for the third-generation mobile phone standard (3GPP standard), and it will be adopted for next generation mobile communication standard with high-speed communication. To apply 3GPP standard Turbo code for high-speed communication, sum-product algorithm (SPA) decoding which is less complex, is examined. A previous report proposed to replacement of each constituent decoder by SPA decoders, but this decoding method deteriorates BER performance. We propose a SPA decoding method over the Tanner graph of the whole turbo code. To reduce the time of decoding, min-sum (MS) approximation is introduced. To search for parity check which is suitable for SPA, long constraint length (LCL) parity checks are tried. In addition, a concatenated parity check matrix is used, and a removing four-cycle method (RmFC) is applied before sum-product decoding. As a result, the proposed method realized E_b/N_0=1.1[dB] better BER performance at BER=10^<-6> than previous method. The LCL parity check decoding realized E_b/N_0=0.7[dB] better BER performance at BER=10^<-6> than (15,13)_8 parity check decoding. The concatenated parity check of (43,61)_8 and (201,317)_8 shows good BER performance among three kinds of concatenated parity checks. The proposed method which uses the concatenated parity check of (43,61)_8 and (201,317)_8 after RmFC suppresses the deterioration of BER performance and the gap to max-log-MAP decoding becomes E_b/N_0=1.3[dB] at BER=10^<-6>. The laytency for decoding of the proposed method becomes 1/2000 of that of max-log-MAP decoding. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | sum-product algorithm / turbo codes / parity check matrix |
| Paper # | IT2008-63,ISEC2008-121,WBS2008-76 |
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| Conference Information | |
| Committee | WBS |
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| Conference Date | 2009/3/2(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| Registration To | Wideband System(WBS) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Sum-Product Decoding of 3GPP Turbo Code |
| Sub Title (in English) | |
| Keyword(1) | sum-product algorithm |
| Keyword(2) | turbo codes |
| Keyword(3) | parity check matrix |
| 1st Author's Name | Toru ANZAI |
| 1st Author's Affiliation | Dept. of Electrical Engineering, Nagaoka University of Technology() |
| 2nd Author's Name | Toshiyuki SHOHON |
| 2nd Author's Affiliation | Dept. of Electrical Engineering, Nagaoka University of Technology |
| 3rd Author's Name | Haruo OGIWARA |
| 3rd Author's Affiliation | Dept. of Electrical Engineering, Nagaoka University of Technology |
| Date | 2009-03-09 |
| Paper # | IT2008-63,ISEC2008-121,WBS2008-76 |
| Volume (vol) | vol.108 |
| Number (no) | 474 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |