| Presentation | 2005/2/23 Comparison between Irregular LDPC and Turbo Codes Considering Number of Iterations of Decoder in OFDM Broadband Packet Wireless Access Fumito Ito, Riaz Esmailzadeh, Masao Nakagawa, Nobuhiko Miki, Hiroyuki Atarashi, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This paper investigates the relation between the average packet error rate (PER) performance and the average number of inerations for the iterative decoding in Irregular low-density parity-check (LDPC) code for downlink OFDM broadband packet wireless access in a multipath fading channel. In the investigation, the average number of iterations is calculated by taking into account the stop in the iterative decoding based on parity check result, and we parameterized the channel encoding block size, the coding rate, R, and the data modulation schemes, respectively. Simulation results show that, for Irregular LDPC code using belief propagation (BP) algorithm with 50 iterations at maximum, the average number of iterations is sensitive to the employed coding rate rather than the encoding block size and data modulation schemes. In this case, the average number of iterations is approximately 8, 5, and 4 times for R=1/2, 3/4, and 8/9, respectively, under the condition of the average received signal energy per bit-to-noise power density ratio (E_b/N_0) for achieving the average PER of 10^<-2>. Consequently, while achieving the almost same average PER performance between Irregular LDPC and Turbo codes, the decoding complexity of Irregular LDPC code assuming the average number of iterations is reduced by 17, 8, and 4% for R=1/2, 3/4 and 8/9, respectively, compared to that of Turbo code using Log-MAP decoding algorithm with 8 iterations. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Irregular LDPC code / Turbo code / number of iterations / multipath fading channel / OFDM |
| Paper # | WBS2004-77,A・P2004-258,RCS2004-345,MoMuC2004-128,MW2004-255 |
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| Conference Information | |
| Committee | WBS |
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| Conference Date | 2005/2/23(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| 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) | Comparison between Irregular LDPC and Turbo Codes Considering Number of Iterations of Decoder in OFDM Broadband Packet Wireless Access |
| Sub Title (in English) | |
| Keyword(1) | Irregular LDPC code |
| Keyword(2) | Turbo code |
| Keyword(3) | number of iterations |
| Keyword(4) | multipath fading channel |
| Keyword(5) | OFDM |
| 1st Author's Name | Fumito Ito |
| 1st Author's Affiliation | Department of Information and Computer Science, Keio University() |
| 2nd Author's Name | Riaz Esmailzadeh |
| 2nd Author's Affiliation | Department of Information and Computer Science, Keio University |
| 3rd Author's Name | Masao Nakagawa |
| 3rd Author's Affiliation | Department of Information and Computer Science, Keio University |
| 4th Author's Name | Nobuhiko Miki |
| 4th Author's Affiliation | IP Radio Network Development Department, NTT DoCoMo Inc. |
| 5th Author's Name | Hiroyuki Atarashi |
| 5th Author's Affiliation | IP Radio Network Development Department, NTT DoCoMo Inc. |
| Date | 2005/2/23 |
| Paper # | WBS2004-77,A・P2004-258,RCS2004-345,MoMuC2004-128,MW2004-255 |
| Volume (vol) | vol.104 |
| Number (no) | 672 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |