Evaluation of Massive MIMO Considering Real Propagation Characteristics in the 20-GHz Band

Taniguchi, Rin-ichiro; Nishimori, Kentaro; Kataoka, Ryochi; Kameyama, Keisuke; Kitao, Koshiro; Tran, Ngochao; Imai, T.

doi:10.1109/tap.2017.2754441

Cited by 10 publications

(4 citation statements)

References 22 publications

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“…We may wonder how the considered directivity variation influences the communication rate. To answer this question we could calculate the zero-forcing communication rate, similarly to the approach in [28], by means of:…”

Section: B Communication Rate Analysismentioning

confidence: 99%

Optimizing Antenna Arrays for Spatial Multiplexing: Towards 6G Systems

2021

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In this paper we discuss the design of antenna arrays to be used for multiplexing applications. In particular, we introduce a suitable performance index to analyze the effect of the antenna geometry and the distribution of users for the overall performance of Multi-User Multiple Input Multiple Output systems. By means of such performance index, antenna arrays can be designed so as to increase the number of multiplexed parallel sub-channels . Numerical results show that a proper design could allow to double the contemporary served users and the overall system throughput.

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Section: B Communication Rate Analysismentioning

confidence: 99%

Optimizing Antenna Arrays for Spatial Multiplexing: Towards 6G Systems

2021

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“…Until now, experiments have been reported in the 2 to 5 GHz band for 5G [2] [3]. Also, the direction of arrival of the microwave band was indicated in our previous study [4]. In this report, radio propagation measurement is performed for micro and milli-meter waves (5.12 and 19.55 GHz band), which are expected to be used in 5G.…”

Section: Introductionmentioning

confidence: 91%

Comparison of SNR and channel capacity with micro and milli-meter wave bands based on outdoor propagation measurement

Taniguchi

Nishimori

2020

IEICE ComEX

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The 5-th generation mobile communication system (5G), which is the next generation communication system, is being developed. In 5G, it is assumed that multiple cells with different frequency bands will be used. The attenuation of signal power due to propagation loss in free space and the reflection of radio waves from buildings, etc., differs depending on the frequency. In this paper, a radio propagation measurement is performed for micro and milli-meter waves (5 and 19 GHz bands), which will be used in 5G. The outdoor propagation characteristics of each frequency band based on the measured channel state information are evaluated in terms of the signal to noise ratio and channel capacity.

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“…k , as per equation (14). That is, a MMSE BF requires a complexity of order O((LN) 3 ) both for the DL and UL.…”

Section: A Complexity Assessmentmentioning

confidence: 99%

User-Heterogeneous Cell-Free Massive MIMO Downlink and Uplink Beamforming via Tensor Decomposition

Ando

Iimori

Abreu

et al. 2022

IEEE Open J. Commun. Soc.

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We consider a cell-free massive MIMO (CF-mMIMO) system in which multiple access points (APs), connected to a common central processing unit (CPU) through unbounded fronthaul, collaboratively serve multiple users in a heterogeneous scenario in which each user equipment (UE) has a different number of antennas, and therefore is capable of communicating via distinct numbers of digital streams. For such a user-heterogeneous system, new joint transmit (TX)/receive (RX) beamforming (BF) algorithms are then proposed, both for downlink and uplink modes and integrated with two alternative transmit (TX) power and spatial resource allocation strategies, which enable interference-free communications. To that end, a novel tensor decomposition scheme is presented, based on an orthogonality-enforcing modification of the recently-proposed multilinear generalized singular value decomposition (ML-GSVD). Simulation results show both that the new orthogonality-enforcing ML-GSVD (OEML-GSVD) achieves greater accuracy than the previous multilinear generalized singular value decomposition (ML-GSVD) without sacrificing convergence speed, and that the corresponding OEML-GSVD-based proposed beamformers outperform state-of-the-art (SotA) techniques, as well as an equivalent beamformer based on the previous ML-GSVD alternative.INDEX TERMS Cell-free massive MIMO (CF-mMIMO), beamforming design, tensor factorization, multilinear generalized singular value decomposition (ML-GSVD).

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Evaluation of Massive MIMO Considering Real Propagation Characteristics in the 20-GHz Band

Cited by 10 publications

References 22 publications

Optimizing Antenna Arrays for Spatial Multiplexing: Towards 6G Systems

Optimizing Antenna Arrays for Spatial Multiplexing: Towards 6G Systems

Comparison of SNR and channel capacity with micro and milli-meter wave bands based on outdoor propagation measurement

User-Heterogeneous Cell-Free Massive MIMO Downlink and Uplink Beamforming via Tensor Decomposition

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