期刊
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
卷 20, 期 7, 页码 4238-4252出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TWC.2021.3057227
关键词
Reliability; Array signal processing; Millimeter wave communication; Transmitting antennas; Downlink; Transceivers; Signal to noise ratio; Reliable communication; blockage; mmWave; coordinated multi-point; weighted sum-rate maximization; successive convex approximation; Karush-Kuhn-Tucker conditions
资金
- European Commission [815056]
- Academy of Finland [313041, 311741, 318927]
- Nokia Foundation
- Riitta ja Jorma J. Takanen Foundation
- Tauno Tonningin Saation Foundation
- Academy of Finland (AKA) [313041, 311741, 313041, 311741] Funding Source: Academy of Finland (AKA)
The study proposes a method to improve communication reliability through multi-point connectivity and beamformer design. The algorithm in the study, which considers blockage-aware weighted sum-rate maximization, is practical and computationally efficient.
The fundamental challenge of the millimeter-wave (mmWave) frequency band is the sensitivity of the radio channel to blockages, which gives rise to unstable connectivity and impacts the reliability of a system. To this end, multi-point connectivity is a promising approach for ensuring the desired rate and reliability requirements. A robust beamformer design is proposed to improve the communication reliability by exploiting the spatial macro-diversity and a pessimistic estimate of rates over potential link blockage combinations. Specifically, we provide a blockage-aware algorithm for the weighted sum-rate maximization (WSRM) problem with parallel beamformer processing across distributed remote radio units (RRUs). Combinations of non-convex and coupled constraints are handled via successive convex approximation (SCA) framework, which admits a closed-form solution for each SCA step, by solving a system of Karush-Kuhn-Tucker (KKT) optimality conditions. Unlike the conventional coordinated multi-point (CoMP) schemes, the proposed blockage-aware beamformer design has, per-iteration, computational complexity in the order of RRU antennas instead of system-wide joint transmit antennas. This leads to a practical and computationally efficient implementation that is scalable to any arbitrary multi-point configuration. In the presence of random blockages, the proposed schemes are shown to significantly outperform baseline scenarios and result in reliable mmWave communication.
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