Beamforming Design for Low-Power In-Band Wireless Backhaul Systems: Centralized and Distributed Approaches

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In this paper, we develop beamforming (BF) schemes to minimize the total transmitted power of both uplink (UL) and downlink (DL) in two-tier network with in-band wireless backhaul (WB) while the target rates of user equipment (UE) are satisfied under the backhaul constraints. We propose a centralized BF scheme with an alternate update algorithm optimizing the BF matrices and power allocation (PA) vectors. Then the UL-DL feasible target rate region of the proposed scheme is analyzed, which can be enlarged in both UL and DL by increasing the number of antennas of small cell base stations (SBSs). Simulation results show that the proposed in-band WB system for two-tier network can save the power consumption by 33.5 % and 82.1 % compared with the out-of-band WB system and conventional one-tier network, respectively, at the UE target rates of 80 Mbps in DL and 40 Mbps in UL. In addition, we propose a distributed BF scheme to locally optimize the variables at each SBS, which can achieve above 90 % of the feasible target rate region of the centralized scheme without the instantaneous information exchange.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2019-02
Language
English
Article Type
Article
Citation

IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, v.68, no.2, pp.1549 - 1563

ISSN
0018-9545
DOI
10.1109/TVT.2018.2888496
URI
http://hdl.handle.net/10203/251645
Appears in Collection
EE-Journal Papers(저널논문)
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