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This paper proposes an enhanced interference measurement method that provides accurate channel quality indicators (CQIs) to improve the system performance in coordinated multi-point (CoMP) transmission and reception. In CoMP operations, user equipments (UEs) need to report different CQIs based on different interference hypotheses. Even though a variety of interference measurement schemes are proposed,...
Codebook based multiple-input multiple-output (MIMO) precoding can significantly improve the system spectral efficiency with limited feedback and has been accepted as one of the most promising techniques for the evolved UTRA (E-UTRA). Compared with single-user (SU) MIMO, multi-user (MU) MIMO can further improve the system spectral efficiency due to increased degree of freedom in transmission. In order...
Codebook based multiple-input multiple-output (MIMO) preceding can significantly improve the system spectral efficiency with limited feedback and has been accepted as one of the most promising techniques for the Evolved UTRA (E-UTRA). Compared with single-user (SU) MIMO, multi-user (MU) MIMO can further improve the system spectral efficiency due to increased degree of freedom in transmission. In order...
Codebook based multiple-input multiple-output (MIMO) precoding can significantly improve the system spectral efficiency with limited feedback and has been accepted as one of the most promising techniques for the Evolved UTRA (E-UTRA). In this paper, firstly, we investigate precoding techniques through system-level simulation in EUTRA environment including various precoding modes, precoding methods...
Opportunistic beamforming, also called random beamforming, has been proved to be an effective way to utilize spatial resource for downlink of multiuser scheduling systems (P. Viswanath et al., 2002). The basic idea is to artificially create large channel fluctuations among different users by transmitting random weighted signal copies from multiple transmit antennas. These fluctuations can then be...
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