Improved ZF-like Intra-Tier Precoder for A VFDM Based Two-Tier System

In this paper, we study the design of two improved zero forcing-like (ZF-like) precoders in a two-tier cognitive network, consisting of a macro cell (MC) and multiple small cells (SCs). By exploiting Vandermonde-subspace frequency division multiplexing (VFDM) transmission, the cognitive SCs can coex...

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Vydáno v:2018 25th International Conference on Telecommunications (ICT) s. 47 - 51
Hlavní autoři: Yao, Rugui, Jiang, Pengfei, Yao, Lukun, Gao, Yan, Zhang, Yuxin, Zuo, Xiaoya
Médium: Konferenční příspěvek
Jazyk:angličtina
Vydáno: IEEE 01.06.2018
Témata:
Frequency division multiplexing
Hidden Markov models
Interference
Matrix decomposition
OFDM
Precoding
Propagation losses
sum capacity
transmitted dimension
Vandermonde-subspace frequency division multiplexing (VFDM)
zero-forcing (ZF)
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Shrnutí:In this paper, we study the design of two improved zero forcing-like (ZF-like) precoders in a two-tier cognitive network, consisting of a macro cell (MC) and multiple small cells (SCs). By exploiting Vandermonde-subspace frequency division multiplexing (VFDM) transmission, the cognitive SCs can coexist with the MC. We first review the cooperative cross-tier precoder (CTP) design to mitigate the interference from the SCs to the MC. The cooperative CTP allows us to use more efficient intra-tier precoder (ITP) in SCs to handle intra-tier interference. Although block-diagonal zero-forcing (BD-ZF) ITP can completely suppress the interference among the SCs, it also causes loss of some transmitted dimensions. Considering this problem, we design the focalized zero-forcing (F-ZF) ITP and regularized zero forcing (R-ZF) ITP precoding schemes. Then, the transmitted dimensions of the three schemes are discussed and compared. Numerical simulation results show that the two improved ZF-like ITPs can significantly improve the capacity of two-tier network.
DOI:10.1109/ICT.2018.8464874