| Presentation | 2014-12-19 Single-Carrier Multi-User MIMO with Time-Domain Transmit Equalization and THP Applying M Algorithm Based Perturbation Vector Search Shohei YOSHIOKA, Shinya KUMAGAI, Fumiyuki ADACHI, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In a combination of broadband single-carrier (SC) block transmission with transmit equalization (TE) and multi-user (MU) multiple-input multiple-output (MIMO), frequency diversity gain can be obtained while a base station (BS) communicates simultaneously with multiple users using the same frequency. TE is considered as removing both inter-symbol interference (ISI) caused by the frequency-selective fading and amplitude variation in received signals, and consequently, increases signal power significantly. Recently, we proposed SC-MU-MIMO with time-domain TE and Tomlinson-Harashima preceding (TD-SC-TETHP), where TD-THP removes ISI as well as inter-user interference (IUI), and then the amplitude variation is removed. Modulo operation in TD-SC-TETHP can suppress the signal power increase caused by ISI removal. Performing only the amplitude variation removal after THP can avoid increasing the signal power significantly. As a result, the received signal-to-noise power ratio (SNR) improves. However, modulo operation takes into account the power increase caused by the former signal processings, and thereby is not the optimal scheme for signal power suppression. Modulo operation shifts the desired signal after the interference subtraction near the original constellation by adding a auxiliary signal vector. The vector can be regarded as a kind of perturbation vector in vector perturbation (VP). It is expected that finding and adding the optimal perturbation vector in TD-SC-TETHP suppress the signal power increase more and improve the received SNR. In this paper, we propose TD-SC-TETHP applying M algorithm based perturbation vector search. An ordering is performed to improve the accuracy of M algorithm based perturbation vector search. We show, by computer simulation, the proposed TD-SC-TETHP provides better average bit error rate (BER) performance than conventional TD-SC-TETHP and VP applying QR decomposition and M algorithm based perturbation vector search for SC-MU-MIMO (SC-VP). Computational complexity of the proposed TD-SC-TETHP is compared to those of the conventional TD-SC-TETHP and SC-VP. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | SC-MU-MIMO / Tomlinson-Harashima Preceding / Transmit equalization / Time-domain / M algorithm |
| Paper # | RCS2014-253 |
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| Conference Information | |
| Committee | RCS |
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| Conference Date | 2014/12/11(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Radio Communication Systems (RCS) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Single-Carrier Multi-User MIMO with Time-Domain Transmit Equalization and THP Applying M Algorithm Based Perturbation Vector Search |
| Sub Title (in English) | |
| Keyword(1) | SC-MU-MIMO |
| Keyword(2) | Tomlinson-Harashima Preceding |
| Keyword(3) | Transmit equalization |
| Keyword(4) | Time-domain |
| Keyword(5) | M algorithm |
| 1st Author's Name | Shohei YOSHIOKA |
| 1st Author's Affiliation | Dept. of Communications Engineering, Graduate School of Engineering, Tohoku University() |
| 2nd Author's Name | Shinya KUMAGAI |
| 2nd Author's Affiliation | Dept. of Communications Engineering, Graduate School of Engineering, Tohoku University |
| 3rd Author's Name | Fumiyuki ADACHI |
| 3rd Author's Affiliation | Dept. of Communications Engineering, Graduate School of Engineering, Tohoku University |
| Date | 2014-12-19 |
| Paper # | RCS2014-253 |
| Volume (vol) | vol.114 |
| Number (no) | 372 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |