open access

https://hdl.handle.net/2115/78883

Performance Evaluation of Beam Shapes in a Two-Step-Precoded Massive MIMO System

英語

two-step beamforming

2020-06

電子情報通信学会(The Institute of Electronics, Information and Communication Engineers / IEICE)

IEICE transactions on communications

E103.B(6)

703-711

Massive MIMO is known as a promising technology for multiuser multiplexing in the fifth generation mobile communication system to accommodate the rapidly-increasing traffic. It has a large number of antenna elements and thus provides very sharp beams. As seen in hybrid beamforming, there have already been many papers on the concatenation of two precoders (beamformers). The inner precoder, i.e., a multi-beam former, performs a linear transformation between the element space and the beam space. The outer precoder forms nulls in the limited beam space spanned by selected beams to suppress the inter-user interference. In this two-step precoder, the beam shape is expected to determine the system performance. In this paper, we evaluate the achievable throughput performance for different beam-shaping schemes: a discrete Fourier transform (DFT) beam, Chebyshev weighted beams, and Taylor weighted beam. Simulations show that the DFT beam provides the best performance except the case of imperfect precoding and cell edge SNR of 30 dB.

学術雑誌論文

Version of Record

copyright©2020 IEICE

0916-8516

1745-1345

AA11510208