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Minimum mean square error (MMSE) signal detection is near-optimal for uplink multi-user large-scale MIMO systems with hundreds of antennas at the base station, but involves matrix inversion with high complexity. In this paper, we first prove that the filtering matrix of the MMSE algorithm in large-scale MIMO is symmetric positive definite, based on which we propose a low-complexity signal detection...
The popularity of online shopping highlights the need for targeted marketing. Instead of broadcasting advertisement to an entire online community, targeted marketing aims at key users, namely, influential reviewers whose reviews may affect a large group of his friends, acquaintances or other online customers to buy the product. This paper proposes a method for identifying key users, based on mining...
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