title: Computer Simulation and Field Experiment for Downlink Multiuser MIMO in Mobile WiMAX System.
abstract: 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.
authors.affiliation: Department of Computer and Media Engineering, Tokyo University of Science, Suwa 5000-1, Toyohira, Chino-shi, Nagano 391-0292, Japan.
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Yamaguchi
authors.affiliation: Department of Computer and Media Engineering, Tokyo University of Science, Suwa 5000-1, Toyohira, Chino-shi, Nagano 391-0292, Japan.
authors.forename: Takaharu
authors.initials: T
authors.lastname: Nagahashi
authors.affiliation: Department of Computer and Media Engineering, Tokyo University of Science, Suwa 5000-1, Toyohira, Chino-shi, Nagano 391-0292, Japan.
authors.forename: Takuya
authors.initials: T
authors.lastname: Akiyama
authors.affiliation: Department of Computer and Media Engineering, Tokyo University of Science, Suwa 5000-1, Toyohira, Chino-shi, Nagano 391-0292, Japan.
authors.forename: Hideaki
authors.initials: H
authors.lastname: Matsue
authors.affiliation: Azumino City, Nagano, Japan.
authors.forename: Kunio
authors.initials: K
authors.lastname: Uekado
authors.affiliation: MIRAIT Technologies Corporation, Japan.
authors.forename: Takakazu
authors.initials: T
authors.lastname: Namera
authors.affiliation: MIRAIT Technologies Corporation, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Fukui
authors.affiliation: NPO CCC21L, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Nanamatsu