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| Content Provider | Directory of Open Access Journals (DOAJ) |
|---|---|
| Author | Guixian Xu Chia-Hsiang Lin Weiguo Ma Shanzhi Chen Chong-Yung Chi |
| Abstract | Heterogeneous network (HetNet), employing massive multiple-input multiple-output (MIMO), has been recognized as a promising technique to enhance network capacity, and to improve energy efficiency for the fifth generation of wireless communications. However, most existing schemes for coordinated beamforming (CoBF) for a massive MIMO HetNet unrealistically assume the availability of perfect channel state information (CSI) on one hand, and cascade of each antenna with a distinct radio-frequency chain in massive MIMO is neither power nor cost-efficient on the other hand. In this paper, we consider a massive MIMO-enabled HetNet framework, consisting of one macrocell base station (MBS) equipped with an analog beamformer, followed by a digital beamformer, and one femtocell base station (FBS) equipped with a digital beamformer. In the presence of Gaussian CSI errors, we propose a robust hybrid CoBF (HyCoBF) design, including an analog beamforming design for MBS, and a digital CoBF design for both MBS and FBS. To this end, an outage probability-constrained robust HyCoBF problem is formulated by minimizing the total transmit power. The analog beamforming mechanism at MBS is a newly devised low-complexity beam selection scheme by selecting analog beams from a discrete Fourier transform matrix codebook. Then, a conservative approximate CoBF solution is obtained via semidefinite relaxation and an extended Bernsteintype inequality. Furthermore, a distributed implementation for the obtained CoBF solution using alternating direction method of multipliers is proposed. Finally, numerical simulations are provided to demonstrate the efficacy of the proposed robust HyCoBF algorithm. |
| e-ISSN | 21693536 |
| DOI | 10.1109/ACCESS.2017.2683639 |
| Journal | IEEE Access |
| Volume Number | 5 |
| Language | English |
| Publisher | IEEE |
| Publisher Date | 2017-01-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Electrical Engineering. Electronics. Nuclear Engineering Heterogeneous Network (hetnet) Massive Mimo Hybrid Coordinated Beamforming (hycobf) Semidefinite Relaxation (sdr) Alternating Direction Method of Multipliers (admm) |
| Content Type | Text |
| Resource Type | Article |
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