Robust Hybrid Beamforming in Millimeter Wave Relay Networks With Imperfect CSI | Zendy

Zhen Luo | Zendy; Choujun Zhan | Zendy; Lin Zhang | Zendy; Rongbin Zhang | Zendy

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Robust Hybrid Beamforming in Millimeter Wave Relay Networks With Imperfect CSI

Author(s) -

Zhen Luo,

Choujun Zhan,

Lin Zhang,

Rongbin Zhang

Publication year - 2018

Publication title -

ieee access

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.587

H-Index - 127

ISSN - 2169-3536

DOI - 10.1109/access.2018.2881714

Subject(s) - aerospace , bioengineering , communication, networking and broadcast technologies , components, circuits, devices and systems , computing and processing , engineered materials, dielectrics and plasmas , engineering profession , fields, waves and electromagnetics , general topics for engineers , geoscience , nuclear engineering , photonics and electrooptics , power, energy and industry applications , robotics and control systems , signal processing and analysis , transportation

Millimeter-wave (mmWave) communication offers rich spectrum resources and acts as a key enabling technology for future wireless communication systems. Hybrid (digital and analog) beamforming and relay techniques are important for mmWave implementations considering the characteristics of mmWave signals, as well as the practical limitations of equipment size, power consumption, and hardware cost. In this paper, a robust hybrid beamforming scheme is presented for mmWave multiple-input multiple-output relay networks adopting amplify-and-forward strategy at the relays. Unlike most existing designs that are based on the perfect channel-state information (CSI), CSI imperfectness is considered in the proposed robust beamforming scheme. An accurate approximation of the average received signal-to-noise ratio is derived and used as the design criterion for the developed iterative beamforming optimization at different nodes. An orthogonal matching pursuit-based algorithm is then utilized to design the hybrid beamforming schemes. Simulation results show that the proposed robust beamforming scheme with affordable computational complexities provides substantial performance gains compared with the existing non-robust designs.

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