Millimeter Wave SDMA with Limited Feedback: RF-only Beamforming Can Outperform Hybrid Beamforming

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Millimeter wave (mmWave) beamforming (BF) system can increase the spatial capacity by being installed in hotspot areas where a number of users exist. However, it is hard to obtain the channel state information of a large array system at transmitter. Even with the codebook-based BF scheme, the digital-analog hybrid BF structure may require two-step feedback procedure. In order to reduce the feedback and feedforward overhead required for joint user scheduling and hybrid BF, we propose a codebook-based RF-only BF scheme with one-step feedback procedure. We show that the achievable sum rate of the RF-only BF scheme double-logarithmically scales with the number of users in mmWave channel model, which coincides with the results for the digital BF schemes in rich scattering channel model. We also show that the RF-only BF scheme can outperform the hybrid BF scheme with limited feedback. In addition, we examine the error performance in extremely sparse channel, and find the number of transmitted beams to achieve the desired rate per user in a small number of users regime.
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.1534 - 1548

ISSN
0018-9545
DOI
10.1109/TVT.2018.2888480
URI
http://hdl.handle.net/10203/251646
Appears in Collection
EE-Journal Papers(저널논문)
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