Digital Beamforming Algorithm for 5G Low-SHF Band Massive MIMO

Yoshioka, Shohei; Suyama, Satoshi; Okuyama, Toru; Mashino, Jun; Okumura, Yukihiko

doi:10.1587/transcom.2018ttp0020

Cited by 9 publications

(3 citation statements)

References 14 publications

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“…We define a complementary channel matrix (CCM) [15] H𝑘 ∈ C ( 𝑁 𝑟 −𝑁 𝑟 𝑘 )×𝑁 𝑡 , which is given by discarding a submatrix 𝑯 𝑘 from the downlink MIMO channel matrix in Eq. (2).…”

Section: Simplified Bd Schemementioning

confidence: 99%

“…A multiple-input multiple-output (MIMO) communication system equipped with multiple antennas, which enables space division multiplexing (SDM) or space division multiple access (SDMA), is the most famous one for satisfying these requirements. Over the past two decades, a large number of techniques for single-user (SU) MIMO to realize the SDM for high-speed communications per user and multi-user (MU) MIMO to enable the SDMA for large-capacity communicatoins have been studied; these techniques have greatly impacted standardization of recent wireless communication systems [1], [2]. Sustainable development of MIMO signalprocessing technologies is still important for future wireless communications.…”

Section: Introductionmentioning

confidence: 99%

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A QR Decomposition Algorithm with Partial Greedy Permutation for Zero-Forcing Block Diagonalization

Kinjo

GAMOH

Yamanaka

2023

IEICE Trans. Fundamentals

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A new zero-forcing block diagonalization (ZF-BD) scheme that enables both a more simplified ZF-BD and further increase in sum rate of MU-MIMO channels is proposed in this paper. The proposed scheme provides the improvement in BER performance for equivalent SU-MIMO channels. The proposed scheme consists of two components. First, a permuted channel matrix (PCM), which is given by moving the submatrix related to a target user to the bottom of a downlink MIMO channel matrix, is newly defined to obtain a precoding matrix for ZF-BD. Executing QR decomposition alone for a given PCM provides null space for the target user. Second, a partial MSQRD (PMSQRD) algorithm, which adopts MSQRD only for a target user to provide improvement in bit rate and BER performance for the user, is proposed. Some numerical simulations are performed, and the results show improvement in sum rate performance of the total system. In addition, appropriate bit allocation improves the bit error rate (BER) performance in each equivalent SU-MIMO channel. A successive interference cancellation is applied to achieve further improvement in BER performance of user terminals.

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Section: Simplified Bd Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A QR Decomposition Algorithm with Partial Greedy Permutation for Zero-Forcing Block Diagonalization

Kinjo

GAMOH

Yamanaka

2023

IEICE Trans. Fundamentals

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“…With the aim, therefore, of exploiting the benefits of digital BF while contracting the size of the matrix to be estimated, we adopted technology that first forms multiple beams in predetermined directions using a many-element antenna and then estimates channel information between those multiple beams and the mobile station [2]. With this approach, the size of the matrix to be estimated can be reduced from number of mobile station elements × number of base station elements to number of mobile station elements × number of beams.…”

Section: Feature Articlesmentioning

confidence: 99%

Improving Communication Performance in High-mobility Environments by Millimeter-wave Base Station Cooperation for 5G evolution

Okuyama

Suyama

Nonaka

et al. 2021

NTT Technical Review

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Although the 5th-generation mobile communications system (5G) commercial services are now being provided, further evolution of 5G is needed to meet a variety of future demands. As part of these studies, we consider the provision of millimeter-wave high-speed communications over a wide area to multiple mobile stations traveling at high speed. In a high-mobility environment, area construction must be performed over a wide area through the cooperation of multiple base stations. Additionally, to achieve simultaneous communications with multiple mobile stations, interference must be suppressed so that signals transmitted to each mobile station do not interfere with each other. To deal with these issues, we developed millimeter-wave base station cooperation technology to enable multiple base stations to cooperate with each other while suppressing inter-mobile-station interference by applying digital beamforming to base stations to generate and control beams by digital signal processing. We showed through outdoor experimental trials that high communication speeds could be achieved over a wide area.

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Millimeter-Wave Base Station Cooperation Technologies for High-Mobility Environments

Okuyama¹,

Suyama²,

Nonaka³

et al. 2021

2021 IEEE VTS 17th Asia Pacific Wireless Communications Symposium (APWCS)

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Digital Beamforming Algorithm for 5G Low-SHF Band Massive MIMO

Cited by 9 publications

References 14 publications

A QR Decomposition Algorithm with Partial Greedy Permutation for Zero-Forcing Block Diagonalization

A QR Decomposition Algorithm with Partial Greedy Permutation for Zero-Forcing Block Diagonalization

Improving Communication Performance in High-mobility Environments by Millimeter-wave Base Station Cooperation for 5G evolution

Millimeter-Wave Base Station Cooperation Technologies for High-Mobility Environments

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