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Paper Abstract and Keywords
Presentation 2016-02-19 09:25
Development of Complexity-reduced 4x4 MIMO-MLD Demodulator with Block QR Decomposition
Fumito Ito, Takayuki Nakagawa, Hiroyuki Hamazumi (NHK), Kazuhiko Fukawa (Tokyo Tech)
Abstract (in Japanese) (See Japanese page) 
(in English) The authors have been researching large capacity transmission technology using 4x4 MIMO scheme to develop SHV wireless cameras. As the number of transmitting antennas increases such as a 4x4 MIMO system, the complexity of signal detection by MLD, which is the best technique to achieve low BER performance, becomes large exponentially. To solve this difficulty, we have proposed the complexity-reduced MLD using Block QR decomposition. In this report, we developed an experimental system of 4x4 MIMO-QPSK demodulator using proposed technique and evaluated the effectiveness of complexity reduction and the BER performance. From the result, we succeeded in developing the 4x4 MIMO-QPSK demodulator which reduces multiplications to 54 % and additions-subtractions to 56 % compared with conventional MLD, achieving the BER performance degraded by 1 dB from the result of computer simulation.
Keyword (in Japanese) (See Japanese page) 
(in English) Wireless Camera / MIMO / MLD / Complexity Reduction / Block QR Decomposition / / /  
Reference Info. ITE Tech. Rep., vol. 40, no. 4, BCT2016-29, pp. 49-52, Feb. 2016.
Paper # BCT2016-29 
Date of Issue 2016-02-11 (BCT) 
ISSN Print edition: ISSN 1342-6893    Online edition: ISSN 2424-1970
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Conference Information
Committee BCT IEEE-BT  
Conference Date 2016-02-18 - 2016-02-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Kanpo-No-Yado (Otaru) 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To BCT 
Conference Code 2016-02-BCT-BT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Development of Complexity-reduced 4x4 MIMO-MLD Demodulator with Block QR Decomposition 
Sub Title (in English)  
Keyword(1) Wireless Camera  
Keyword(2) MIMO  
Keyword(3) MLD  
Keyword(4) Complexity Reduction  
Keyword(5) Block QR Decomposition  
1st Author's Name Fumito Ito  
1st Author's Affiliation Science and Technology Research Laboratories, NHK (NHK)
2nd Author's Name Takayuki Nakagawa  
2nd Author's Affiliation Science and Technology Research Laboratories, NHK (NHK)
3rd Author's Name Hiroyuki Hamazumi  
3rd Author's Affiliation Science and Technology Research Laboratories, NHK (NHK)
4th Author's Name Kazuhiko Fukawa  
4th Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
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Speaker Author-1 
Date Time 2016-02-19 09:25:00 
Presentation Time 25 minutes 
Registration for BCT 
Paper # BCT2016-29 
Volume (vol) vol.40 
Number (no) no.4 
Page pp.49-52 
Date of Issue 2016-02-11 (BCT) 

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