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PROJECT TITLE :

Cooperative Precoding for Cognitive Transmission in Two-Tier Networks

ABSTRACT:

During this paper, we study cooperative precoder style in two-tier networks, consisting of a macro-cell (MC) and many small-cells (SCs). By exploiting multiuser Vandermonde-subspace frequency division multiplexing (VFDM) transmission, an MC downlink will co-exist with cognitive SCs. In this paper, we first propose a cooperative cross-tier precoder (CTP) among the transmitters in the SCs to increase the transmitted dimension. The cooperative CTP allows us to use a lot of economical intra-tier precoder (ITP) in SCs to handle intracell interference and improve the throughput of the cognitive system. And then, three ITPs, a block-diagonal zero-forcing (BD-ZF) ITP, a capability-achieving (CA) ITP, and a generalized MMSE channel inversion (GMI) ITP, are developed. Complexities of all CTPs and ITPs are mentioned and compared. The overhead of channel state info (CSI) exchange is analyzed. Numerical results are presented to demonstrate the throughput improvement of the proposed schemes and to find the impact of the imperfect CSI. From the complexity comparison and therefore the numerical results, the GMI ITP offers a good tradeoff between complexity and throughput.


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