Interference Reduction Characteristics by Circular Array Based Massive MIMO in a Real Microcell Environment

Kataoka, Ryochi; Nishimori, Kentaro; Tran, Ngochao; Imai, T.; Makino, Hideo

doi:10.1587/transcom.e98.b.1447

Cited by 8 publications

(7 citation statements)

References 12 publications

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“…Therefore, even in the 20-GHz band, ZF is essential for reducing interference when considering a circular array. Note that it is not possible to form a sufficiently narrow beam when applying MRC in a circular array in the 2-GHz band [6]. Next, we evaluate SINR characteristics with a smaller number of antennas at the BS to reduce the complexity of signal processing for the ZF algorithm.…”

Section: Characteristics Of Interference Rejection In Actual Propagatmentioning

confidence: 99%

“…Using a circular or cylindrical array is one of the methods to resolve this issue. Therefore, we previously reported the performance of interference rejection by a cylindrical array using an actual outdoor propagation channel at the 2-GHz band [5,6]. However, the primary targets of massive MIMO are small cells at a high-frequency band [7], because antenna size is considerably large when considering massive MIMO in a macro frequency band.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to the results in [8], this paper presents the characteristics of angular spread in a measured indoor environment. These characteristics significantly affect the transmission performance of massive MIMO [1,6].…”

Section: Introductionmentioning

confidence: 99%

“…The average and standard deviation of the elevation angle spread are 3.6°and 3.1°, respectively. As a higher transmission rate is typically obtained for larger angular spread in MIMO transmission [1,6], arranging array antennas in a horizontal plane is suitable for massive MIMO transmission in an indoor environment.…”

Section: Introductionmentioning

confidence: 99%

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Experimental evaluation of massive MIMO at 20 GHz band in indoor environment

et al. 2017

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Massive multiple input multiple output (MIMO) improves transmission rate without increasing the complexity on signal processing by employing a large number of antennas at a base station. The effect of applying massive MIMO to small cells at the 2-GHz band has been reported. However, the primary targets of massive MIMO are small cells at a highfrequency band, because antenna size is considerably large when considering massive MIMO in a macro frequency band. In this study, measurements are performed for actual propagation channels using a wideband channel sounder with a horn antenna in the 20-GHz band in an actual indoor propagation environment. Moreover, the performance of interference rejection is evaluated using a virtual circular array antenna with 24 elements. Keywords: massive MIMO, indoor propagation characteristics, 20-GHz band, circular array, maximum ratio combining, zero forcing Classification: Antennas and Propagation , vol. 31, no. 2, pp. 160-171, Feb. 2013. DOI:10.1109/JSAC.2013 H. Yang and T. L. Marzetta, "Performance of conjugate and zero-forcing beamforming in large-scale antenna systems," IEEE J. Sel. Areas Commun., vol. 31, no. 2, pp. 172-179, Feb. 2013. DOI:10.1109/JSAC.2013 S. Suyama, J. Shen, T. Obara, M. Sumi, M. Nakajima, and Y. Okumura, "Basic performances of super high bit rate massive MIMO transmission using higher frequency bands," IEICE References

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Section: Characteristics Of Interference Rejection In Actual Propagatmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental evaluation of massive MIMO at 20 GHz band in indoor environment

et al. 2017

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“…One of the possible solutions to fulfilling this requirement is the use of a circular array in which a number of patch antennas are arranged in a cylindrical manner [ 7 , 8 ]. However, there is a certain drawback to this configuration in that each patch antenna radiates in a direction normal to the surface of the patch, resulting in a situation in which not all of the radiation beams contribute to MIMO spatial multiplexing when an incident wave comes from a particular azimuthal direction.…”

Section: Introductionmentioning

confidence: 99%

Full-Azimuth Beam Steering MIMO Antenna Arranged in a Daisy Chain Array Structure

2020

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This paper presents a multiple-input, multiple-output (MIMO) antenna system with the ability to perform full-azimuth beam steering, and with the aim of realizing greater than 20 Gbps vehicular communications. The MIMO antenna described in this paper comprises 64 elements arranged in a daisy chain array structure, where 32 subarrays are formed by pairing elements in each subarray; the antenna yields 32 independent subchannels for MIMO transmission, and covers all communication targets regardless of their position relative to the array. Analytical results reveal that the proposed antenna system can provide a channel capacity of more than 200 bits/s/Hz at a signal-to-noise power ratio (SNR) of 30 dB over the whole azimuth, which is equivalent to 20 Gbps for a bandwidth of 100 MHz. This remarkably high channel capacity is shown to be due to two significant factors; the improved directivity created by the optimum in-phase excitation and the low correlation between the subarrays due to the orthogonal alignment of the array with respect to the incident waves. Over-the-air (OTA) experiments confirm the increase in channel capacity; the proposed antenna can maintain a constant transmission rate over all azimuth angles.

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