A Beam-Steering Transmitarray Antenna for 5G MIMO Channel Sounding in V-band

The user traffic in the mobile communication area has rapidly increased owing to the widespread of smartphones and various cloud services. To handle the increasing traffic, in the fifth-generation mobile communication system (5G), the millimeter-wave multiple-input and multiple-output (MIMO) communication technology is under development. Because the MIMO transmission performance heavily depends on the radio propagation characteristics, various MIMO channel measurements are needed for the performance evaluation and system design. The accurate and efficient parameter estimation algorithm which estimates the propagation delays and angle of arrivals (AoA) of radio waves is also indispensable for the purpose. In this paper, we extended the joint delay and azimuth estimation (JADE) method based on multiple signal classification (MUSIC) algorithm. In our proposal, the drawback of the MUSIC that the performance degrades for the estimation of coherent waves was solved by applying the smoothing technique in the frequency domain. It also makes the antenna calibration simpler. We implemented the proposed algorithm for the channel sounding system in the 66 GHz band, which is one of the candidate frequency bands for the International Mobile Telecommunications (IMT) system and evaluated the effectiveness through the experiment in an anechoic chamber. The result showed that our proposed method can de-correlate the signal components of coherent waves, and improved the parameter estimation accuracy significantly. The root means square error (RMSE) of the propagation delay estimation was improved from 2.7 ns to 0.9 ns, and the RMSE of the AoA estimation was improved from 20.3 deg. to 7.2 deg. The results are expected to be utilized for the millimeter wave band MIMO channel modeling.

Download Full-text

MIMO channel sounding taking into account small angular spread

The 13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications ◽

10.1109/pimrc.2002.1046555 ◽

2003 ◽

Cited By ~ 2

Author(s):

T.R. Kurpjuhn ◽

W. Utschick

Keyword(s):

Angular Spread ◽

Mimo Channel ◽

Channel Sounding

Download Full-text

Low-Cost Transmitarray Antenna Designs in V-Band based on Unit-Cells with 1 Bit Phase Resolution

Frequenz ◽

10.1515/freq-2019-0140 ◽

2019 ◽

Vol 73 (11-12) ◽

pp. 355-366

Author(s):

Martin Frank ◽

Benedict Scheiner ◽

Fabian Lurz ◽

Robert Weigel ◽

Alexander Koelpin

Keyword(s):

Low Cost ◽

Beam Steering ◽

Experimental Characterization ◽

Frequency Range ◽

Steering Angle ◽

V Band ◽

Unit Cells ◽

Linearly Polarized ◽

Phase Resolution

Abstract This paper presents the design and characterization of linearly polarized low-cost transmitarray antennas with ± 70° azimuth beamforming range in V-band in order to add beam steering functionality to existing radar front ends. The transmitarray antennas are composed of 13 × 13 planar unit-cells. The unit-cells consist of two layers of RO4350B laminate and provide a one bit phase resolution. The desired unit-cell behavior has been validated by simulations and measurements. Eight transmitarrays with different phase distributions have been designed and fabricated to realize different beam steering angles in azimuth. The experimental characterization of the radiation patterns shows the desired performance in the frequency range from 59 GHz to 63 GHz. Additionally, steering angle combinations in azimuth and elevation up to 40° have been realized and successfully demonstrate by measuring the 2D radiation pattern.

Download Full-text

Phase-Noise in TDM-Switched MIMO Channel Sounding and Its Impact on Channel Capacity Estimation

IEEE GLOBECOM 2007-2007 IEEE Global Telecommunications Conference ◽

10.1109/glocom.2007.866 ◽

2007 ◽

Cited By ~ 5

Author(s):

Attaphongse Taparugssanagorn ◽

Juha Ylitalo ◽

Bernard H. Fleury

Keyword(s):

Phase Noise ◽

Channel Capacity ◽

Mimo Channel ◽

Capacity Estimation ◽

Channel Sounding

Download Full-text

MU-MIMO channel emulator with automatic channel sounding feedback for IEEE 802.11ac

2016 IEEE Wireless Communications and Networking Conference ◽

10.1109/wcnc.2016.7564942 ◽

2016 ◽

Author(s):

Tran Thi Thao Nguyen ◽

Leonardo Lanante ◽

Yuhei Nagao ◽

Masayuki Kurosaki ◽

Hiroshi Ochi

Keyword(s):

Mimo Channel ◽

Channel Sounding ◽

Channel Emulator ◽

Ieee 802.11Ac

Download Full-text

Multi-User MIMO Channel Emulator with Automatic Channel Sounding Feedback

IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences ◽

10.1587/transfun.e99.a.1918 ◽

2016 ◽

Vol E99.A (11) ◽

pp. 1918-1927 ◽

Cited By ~ 1

Author(s):

Tran Thi Thao NGUYEN ◽

Leonardo LANANTE ◽

Yuhei NAGAO ◽

Hiroshi OCHI

Keyword(s):

Mimo Channel ◽

Channel Sounding ◽

Channel Emulator

Download Full-text

Subsurface MIMO: A Beamforming Design in Internet of Underground Things for Digital Agriculture Applications

Journal of Sensor and Actuator Networks ◽

10.3390/jsan8030041 ◽

2019 ◽

Vol 8 (3) ◽

pp. 41 ◽

Cited By ~ 7

Author(s):

Abdul Salam

Keyword(s):

Degrees Of Freedom ◽

Phased Array ◽

Beam Steering ◽

Mimo Channel ◽

Interference Channel ◽

Capacity Region ◽

Phased Array Antenna ◽

Soil Medium ◽

Digital Agriculture ◽

Underground Communications

In underground (UG) multiple-input and multiple-output (MIMO), transmit beamforming is used to focus energy in the desired direction. There are three different paths in the underground soil medium through which the waves propagate to reach the receiver. When the UG receiver receives a desired data stream only from the desired path, then the UG MIMO channel becomes a three-path (lateral, direct, and reflected) interference channel. Accordingly, the capacity region of the UG MIMO three-path interference channel, and the degrees of freedom (multiplexing gain of this MIMO channel) requires careful modeling. Therefore, expressions are required for the degrees of freedom of the UG MIMO interference channel. The underground receiver needs to perfectly cancel the interference from the three different components of the EM waves propagating in the soil medium. This concept is based upon reducing the interference of the undesired components to a minimum level at the UG receiver using the receive beamforming. In this paper, underground environment-aware MIMO using transmit and receive beamforming has been developed. The optimal transmit and receive beamforming, combining vectors under minimal intercomponent interference constraints, are derived. It is shown that UG MIMO performs best when all three components of the wireless UG channel are leveraged for beamforming. The environment-aware UG MIMO technique leads to three-fold performance improvements and paves the way for design and development of next-generation sensor-guided irrigation systems in the field of digital agriculture. Based on the analysis of underground radio-wave propagation in subsurface radio channels, a phased-array antenna design is presented that uses water content information and beam-steering mechanisms to improve efficiency and communication range of wireless underground communications. It is shown that the subsurface beamforming using phased-array antennas improves wireless underground communications by using the array element optimization and soil–air interface refraction adjustment schemes. This design is useful for subsurface communication system where sophisticated sensors and software systems are used as data collection tools that measure, record, and manage spatial and temporal data in the field of digital agriculture.

Download Full-text