期刊
IEEE ACCESS
卷 7, 期 -, 页码 18319-18331出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2019.2895204
关键词
Backhaul link; beam alignment/training; millimeter-wave (mmWave); multi-resolution codebook
资金
- National Natural Science Foundation of China [61571118, 61471114, 61601115]
- Six Talent Peaks Project in Jiangsu Province [GDZB-005]
The conflict between heavy training overhead and large beamforming gain is a bottleneck to deploy millimeter-wave (mmWave) communications for the next-generation wireless networks. In response, this paper proposes a subarray-cooperation-based multi-resolution codebook design and the corresponding beam alignment scheme, which enables the mmWave backhaul links to quickly align the desired beam pairs under single-dominant-path channels. The proposed codebook is of a hybrid digital/analog structure, in which the digital component selects subarrays and handles the coupling impacts among the selected subarrays, and the analog component shapes essential sub-beams using phase-shifter groups. In particular, the analog beamformers are configured as equal-size discrete Fourier transform vectors, which are easy to implement. The resulting beam alignment method adaptively selects initial layers according to different transmission signal-to-noise ratios, guaranteeing sufficient success ratios on angle detection. The numerical results evaluate the effectiveness of the proposed scheme.
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