January 2021
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4 Reads
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1 Citation
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Publications (119)
January 2021
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3 Reads
January 2021
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7 Reads
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2 Citations
January 2021
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3 Reads
January 2021
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9 Reads
January 2021
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3 Reads
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3 Citations
January 2021
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3 Reads
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2 Citations
January 2021
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10 Reads
December 2020
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10 Reads
IEICE Communications Express
In this paper, we investigate the signal bit error rate (BER) characteristics of a vehicle-borne weighted polarization maximum ratio combining adaptive array antenna for secure communications. The array comprises orthogonally arranged dipole elements, which are combined using weight functions determined by the cross-polarization power ratio in the propagation environment and the angle of inclination of the antenna. The experimental results show that the required signal-to-noise ratio for the proposed antenna to achieve the prescribed BER is lower than that for a conventional dipole array even in vehicle rollover accidents.
September 2020
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124 Reads
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18 Citations
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.
Citations (62)
... The proposed OTA testing method will be applied to the evaluation of communication performance considering the correlation coefficient between the received signals for other wireless sensor networks, such as the Internet of Things (IoT) and emerging Vehicle-to-Everything (V2X) technologies [37][38][39]. To ensure the success of upcoming connected car systems, the author is currently developing a 256 × 256 MIMO antenna system that utilizes circular array beam steering technology [40]. However, in large-scale MIMO systems, there are some difficulties in terms of realizing OTA measurements. ...
- Citing Conference Paper
January 2021
... The author proposed an OTA evaluation method for a massive MIMO antenna that creates a full-rank channel matrix [17]. The results of the Monte Carlo simulation, which included simulation of the proposed OTA testing method, revealed that even though the channel model comprised a limited number of scatterers, a full-rank channel matrix can be created. ...
- Citing Conference Paper
January 2021
... A fluidically loaded dielectric lens has been deployed for singleelement beam-steering in a modified antipodal Vivaldi antenna element (Zhao et al. 2017). Beam steering in both azimuth and elevation planes have been facilitated by rotating two all metal transmit-array lenses placed above the antenna (Honda et al. 2020). Azimuthal beam-steering can be obtained by arranging the antenna elements of MIMO in a daisychain structure (Liu et al. 2013). ...
- Citing Article
- Full-text available
September 2020
... To analyze the capability of the developed antenna [7], the author proposed a Monte Carlo simulation with randomly arranged scatterers [10]. A small number of differently positioned scatterers were set for each BS antenna using random numbers, confirming that the channel matrix created can achieve full-rank status similar to conventional Monte Carlo simulation. ...
- Citing Conference Paper
December 2019
... They present advantages over alternative techniques, like those based on sequential lobes. Among the variety of applications in which this antenna can be used, we find aircraft tracking in air traffic control [1], flying car-to-car communications [2], indoor communications [3], detection of cosmic debris [4], and others. Conventionally, three-dimensional monopulse antennas based on horns [5], lenses [6] and Cassegrain parabolic antennas [7] are typical candidates to reach narrow beam width and high-gain. ...
- Citing Conference Paper
December 2019
... In Figure 2 an illustrated overview of our ongoing project, conducting research and development work toward a full-azimuth beam steering MIMO array, is shown [18]. We have taken on the big challenge of achieving a 100 Gbps channel capacity on a moving vehicle for the forthcoming sixth-generation (6G) mobile communications. ...
- Citing Conference Paper
June 2019
... (A) Development of higher order MIMO arrays, such as 8 × 8 [12], 16 × 16 [13], and 32 × 32 [14,15] MIMO antenna systems, suitable for implementation in an automobile. 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]. ...
- Citing Conference Paper
June 2019
... (A) Development of higher order MIMO arrays, such as 8 × 8 [12], 16 × 16 [13], and 32 × 32 [14,15] MIMO antenna systems, suitable for implementation in an automobile. 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]. ...
- Citing Conference Paper
May 2019
... Massive MIMO is one of the major fifth-generation mobile communication technologies that can increase capacity by ten times or more, as well as provide high capacity with low latency [10][11][12]. Massive MIMO is an interdisciplinary technology that includes communication systems, signal processing and microwave technology [13,14]. In a recent effort to realize more spectacular gains and simplify the processing of required signals, massive MIMO systems were proposed in [15]. ...
- Citing Conference Paper
May 2019
... Therefore, the antenna placement in the terminal has to be considered carefully. In multi-antenna communication systems, antennas and multi-path fading environment have a significant impact on system performances [3] [4] [5]. For this reason, the evaluation of antenna diversity performances in realistic environments is now mandatory in order to elaborate efficient multi-antenna terminals. ...
- Citing Conference Paper
May 2019