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In the paper, we examine Doppler spectrum and bit-error rate (BER) performance of multiuser MIMO systems in an indoor time-varying environment based on our measured data conducted in a meeting room. Simulation results show that both Doppler spectrum and the BER performance are much dependent on the array orientation and the direction of the receiver motion. In the non-line-of-sight environment, the...
In future cellular radio such as IMT-advanced systems, we will encounter a difficulty in sending uplink signals. This is because transmit power is limited by a battery in a terminal and we need higher transmit power to accommodate a wider frequency bandwidth in a higher frequency band. Virtual MIMO-based cooperative communication is expected to be a key technology to solve this problem. Especially,...
In the paper, performance of multiuser multiple-input multiple-output eigenbeam-space division multiplexing (E-SDM) systems in the downlink transmission is evaluated in both uncorrelated and correlated time-varying fading environments based on computer-generated data. In the ideal case, using the block diagonalization (BD) scheme, inter-user interference can be completely eliminated at each user;...
Recently, a multiuser MIMO system has attracted much attention. In the downlink of the multiuser MIMO system, since the base station simultaneously transmits signals to terminals, there is inter-user interference (IUI) at each terminal. Block diagonalization, which can achieve perfect IUI suppression, has been extensively studied to solve the issue. However, with the scheme we cannot obtain extra...
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