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- W2167034471 abstract "Due to the limited feedback amount, the codebook and feedback design is very important. In order to achieve better tradeoff between overhead and performance, the double codebook structures are proposed and discussed, where a final precoder W is determined by two precoders W1 and W2, which are selected from two different codebooks. In this paper, we give an overview of several double codebook structures and evaluate them based on system level simulations (SLS). We consider two frameworks to determine a final precoder: W1W2 and W2W1 where W1 and W2 track long-term/wideband and short-term/subband channel properties, respectively. It is shown that under 4Tx assumption, double codebooks achieve gains compared with Rel.8 codebook when considering the multi-user (MU) MIMO and do not suffer in the case of single-user (SU) MIMO. Both W1W2 and W2W1 provide nearly the same gains over that for the Rel. 8 codebook with uniform linear array (ULA) deployment. Furthermore, W1W2 framework performs better than W2W1 framework with cross-polarized array (CPA) deployment." @default.
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- W2167034471 date "2011-05-01" @default.
- W2167034471 modified "2023-09-22" @default.
- W2167034471 title "Investigation of Optimum Double Codebook Design for Downlink MIMO in LTE-A" @default.
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- W2167034471 doi "https://doi.org/10.1109/vetecs.2011.5956274" @default.
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