MIRAIT Technologies Corporation

Japan

MIRAIT Technologies Corporation

Japan

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Yamaguchi K.,Tokyo University of Science, Suwa | Nagahashi T.,Tokyo University of Science, Suwa | Akiyama T.,Tokyo University of Science, Suwa | Matsue H.,Tokyo University of Science, Suwa | And 4 more authors.
International Conference on Information Networking | Year: 2015

In this paper, transmission performance for downlink MU-MIMO (Multiuser Multiple-Input Multiple-Output) systems with computer simulation and field experiment are described. The downlink MU-MIMO system is constructed as a transmitter with 6 antennas and receivers with 2 antennas, and the maximum number of users(receivers) is 3. In computer simulation, MU-MIMO transmission system can be realized by using the BD (Block Diagonalization) algorithm, and each user can receive signals without any signal interferences between the other users. BER (Bit Error Rate) performance and channel capacity according to modulation schemes and the number of streams are simulated in spatially correlated multipath fading environment. In field experiment, received power and downlink throughput in UDP layer are measured on the mobile WiMAX system developed at Azumino City in Japan. Compared with the simulated and experimented results, the measured maximum throughput performance in downlink has almost the same performance with the simulated throughput. It is confirmed that the experimental mobile WiMAX system for MU-MIMO transmission is actually performed for increasing the total channel capacity of the system. © 2015 IEEE.


Yamaguchi K.,Tokyo University of Science, Suwa | Nagahashi T.,Tokyo University of Science, Suwa | Akiyama T.,Tokyo University of Science, Suwa | Yamaguchi T.,Tokyo University of Science, Suwa | And 5 more authors.
International Conference on ICT Convergence | Year: 2014

In this paper, transmission performance for downlink MU-MIMO (Multiuser Multiple-Input Multiple-Output) systems with computer simulation and field experiment are described. The downlink MU-MIMO system is constructed as a transmitter with 6 antennas and receivers with 2 antennas, and the maximum number of users(receivers) is 3. In computer simulation, MU-MIMO transmission system can be realized by using the BD (Block Diagonalization) algorithm, and each user can receive signals without any signal interferences between the other users. BER (Bit Error Rate) performance and channel capacity according to modulation schemes and the number of streams are simulated in spatially uncorrelated and correlated multipath fading environment. In field experiment, downlink throughput on UDP layer are measured on the mobile WiMAX system with Matrix A mode and Matrix B mode developed at Azumino City in Japan. Compared with the simulated and experimented results, the measured maximum throughput performance in downlink has almost the same performance with the simulated throughput. It is confirmed that the experimental mobile WiMAX system for MU-MIMO transmission is actually performed for increasing the total channel capacity of the system. © 2014 IEEE.


Yamaguchi K.,Tokyo University of Science, Suwa | Nagahashi T.,Tokyo University of Science, Suwa | Akiyama T.,Tokyo University of Science, Suwa | Matsue H.,Tokyo University of Science, Suwa | And 4 more authors.
Scientific World Journal | Year: 2015

The transmission performance for a downlink mobile WiMAX system with multiuser multiple-input multiple-output (MU-MIMO) systems in a computer simulation and field experiment is described. In computer simulation, a MU-MIMO transmission system can be realized by using the block diagonalization (BD) algorithm, and each user can receive signals without any signal interference from other users. The bit error rate (BER) performance and channel capacity in accordance with modulation schemes and the number of streams were simulated in a spatially correlated multipath fading environment. Furthermore, we propose a method for evaluating the transmission performance for this downlink mobile WiMAX system in this environment by using the computer simulation. In the field experiment, the received power and downlink throughput in the UDP layer were measured on an experimental mobile WiMAX system developed in Azumino City in Japan. In comparison with the simulated and experimented results, the measured maximum throughput performance in the downlink had almost the same performance as the simulated throughput. It was confirmed that the experimental mobile WiMAX system for MU-MIMO transmission successfully increased the total channel capacity of the system. © 2015 Kazuhiro Yamaguchi et al.


PubMed | MIRAIT Technologies Corporation, Tokyo University of Science, Suwa, Azumino City and NPO CCC21L
Type: | Journal: TheScientificWorldJournal | Year: 2015

The transmission performance for a downlink mobile WiMAX system with multiuser multiple-input multiple-output (MU-MIMO) systems in a computer simulation and field experiment is described. In computer simulation, a MU-MIMO transmission system can be realized by using the block diagonalization (BD) algorithm, and each user can receive signals without any signal interference from other users. The bit error rate (BER) performance and channel capacity in accordance with modulation schemes and the number of streams were simulated in a spatially correlated multipath fading environment. Furthermore, we propose a method for evaluating the transmission performance for this downlink mobile WiMAX system in this environment by using the computer simulation. In the field experiment, the received power and downlink throughput in the UDP layer were measured on an experimental mobile WiMAX system developed in Azumino City in Japan. In comparison with the simulated and experimented results, the measured maximum throughput performance in the downlink had almost the same performance as the simulated throughput. It was confirmed that the experimental mobile WiMAX system for MU-MIMO transmission successfully increased the total channel capacity of the system.

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