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This work investigates implementing spatial-correlation-information aided feedback in practical multiple-input multiple-output (MIMO) systems. It is presented that the existing spatial-correlation-information aided feedback approach could be simplified in computational complexity with little performance loss. In comparison with Grassmannian codebooks, the feedback codebooks in the 3GPP LTE Release-8...
This paper proposes a two-dimensional switching diversity (2DSD) technique to enhance the collaborative spatial multiplexing (CSM) scheme for uplink wireless access. By the 2DSD, a single data stream is transmitted over multiple antennas and the mobile station (MS) alternates the transmit antennas from one time-frequency resource unit (RU) to another or from one group of RUs to another. That is, the...
This paper proposes a hierarchical feedback technique to solve the problem of massive feedback overhead in multiuser (MU-) multiple-input-multiple-output (MIMO) transmission, which is a serious obstacle to the application of MU-MIMO in real systems, especially with a joint operation of multiuser scheduling and preceding. Motivated by the observations that the multiuser scheduling phase dominates the...
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