TY - GEN
T1 - Improved ZF-like Intra-Tier Precoder for A VFDM Based Two-Tier System
AU - Yao, Rugui
AU - Jiang, Pengfei
AU - Yao, Lukun
AU - Gao, Yan
AU - Zhang, Yuxin
AU - Zuo, Xiaoya
N1 - Publisher Copyright:
© 2018 IEEE.
PY - 2018/9/13
Y1 - 2018/9/13
N2 - 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.
AB - 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.
KW - Vandermonde-subspace frequency division multiplexing (VFDM)
KW - sum capacity
KW - transmitted dimension
KW - zero-forcing (ZF)
UR - https://www.scopus.com/pages/publications/85054547531
U2 - 10.1109/ICT.2018.8464874
DO - 10.1109/ICT.2018.8464874
M3 - 会议稿件
AN - SCOPUS:85054547531
SN - 9781538623213
T3 - 2018 25th International Conference on Telecommunications, ICT 2018
SP - 47
EP - 51
BT - 2018 25th International Conference on Telecommunications, ICT 2018
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 25th International Conference on Telecommunications, ICT 2018
Y2 - 26 June 2018 through 28 June 2018
ER -