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| Presentation | 2014-07-30 13:30 Joint Frequency-Domain Equalization and De-spreading Based on Belief Propagation for Multi-Code Direct Sequence Spread Spectrum Transmission Hiroyuki Miyazaki, Fumiyuki Adachi (Tohoku Univ.)  RCS2014-89 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | Multi-code direct sequence spread spectrum (DSSS) transmission suffers from residual inter-code interference (ICI) after frequency-domain equalization (FDE) and de-spreading. Joint FDE and de-spreading based on maximum likelihood block signal detection using QR decomposition and M algorithm (QRM-MLBD) is an effective method to solve this problem. However, the computational complexity of QRM-MLBD is much higher than that of FDE and de-spreading because large number of surviving paths is required for M algorithm. Furthermore, when using QRM-MLBD, log-likelihood ratios (LLRs) of some bits cannot be exactly calculated because the candidate sequences having large cumulative path metric are removed at each stage. Therefore, error correction performance of channel decoding is severely degraded. In this paper, we study joint FDE and de-spreading based on belief propagation (BP) for multi-code DSSS transmission to reduce the computational complexity and to improve coded BER performance. We evaluate, by computer simulation, the BER performance in turbo-coded multi-code DSSS transmission with joint FDE and de-spreading based on BP and show that BP can achieve the same BER performance as QRM-MLBD with 6 times lower computational complexity in uncoded case and that BP can achieve the BER performance superior to QRM-MLBD in turbo coded case. |
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| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Multi-code direct sequence spread spectrum transmission / joint frequency-domain equalization and de-spreading / / / / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 114, no. 164, RCS2014-89, pp. 1-6, July 2014. | |
| Paper # | RCS2014-89 | |
| Date of Issue | 2014-07-23 (RCS) | |
| ISSN | Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 | |
| Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| Download PDF | RCS2014-89 |
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| Conference Information | |
| Committee | RCC ASN NS RCS SR |
| Conference Date | 2014-07-30 - 2014-08-01 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Kyoto Terrsa |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Wireless Distributed Network, M2M: Machine-to-Machine, D2D: Device-to-Device, etc. |
| Paper Information | |
| Registration To | RCS |
| Conference Code | 2014-07-RCC-ASN-NS-RCS-SR |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Joint Frequency-Domain Equalization and De-spreading Based on Belief Propagation for Multi-Code Direct Sequence Spread Spectrum Transmission |
| Sub Title (in English) | |
| Keyword(1) | Multi-code direct sequence spread spectrum transmission |
| Keyword(2) | joint frequency-domain equalization and de-spreading |
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| 1st Author's Name | Hiroyuki Miyazaki |
| 1st Author's Affiliation | Tohoku University (Tohoku Univ.) |
| 2nd Author's Name | Fumiyuki Adachi |
| 2nd Author's Affiliation | Tohoku University (Tohoku Univ.) |
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| Speaker | Author-1 |
| Date Time | 2014-07-30 13:30:00 |
| Presentation Time | 25 minutes |
| Registration for | RCS |
| Paper # | RCS2014-89 |
| Volume (vol) | vol.114 |
| Number (no) | no.164 |
| Page | pp.1-6 |
| #Pages | 6 |
| Date of Issue | 2014-07-23 (RCS) |
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