The researchers are creating a compact 28 GHz transceiver that helps double polarized MIMO


IMAGE: A representation of the leak cancellation between polarization signals and the rotation of the polarization at any angle. view More

Credit: 2020 Symposia on VLSI Technology and Circuits

Researchers at Tokyo Institute of Technology (Tokyo Tech) and NEC Corporation have jointly developed a 28 GHz phased array[1] Transceiver that supports double polarized MIMO[2] for fifth generation mobile devices (5G). Advances in 5G will benefit a number of industries ranging from healthcare, manufacturing and transportation to education and entertainment that require high bandwidth and high quality connectivity.

As countries roll out or prepare for 5G services, researchers are stepping up efforts to facilitate the deployment of 5G infrastructure. Dual polarized phased array transceivers are an attractive class of antenna systems that can transmit data simultaneously over horizontally and vertically polarized waves. Numerous studies have shown that double polarized MIMO can improve the data rate and spectrum efficiency in 5G radio units. A problem with these systems, however, is cross polarization leakage[3]This leads to a deterioration in the signal quality, especially in the millimeter wave band.

Now Kenichi Okada’s laboratory in the electrical engineering and electronics department of Tokyo Tech and the NEC Corporation in Japan have developed a transceiver that can cancel cross-polarization interference using a built-in horizontal and vertical (H / V) canceller. Tests have shown that the error vector size[4] in 256QAM[5] can be improved from 7.6% to a more desirable lower value of 3.3% with this new leak cancellation technique. “The cancellation signals are generated for the horizontal and vertical polarization on the transmission side, so that the cross-polarization loss caused by the transmitter / receiver chip, the housing, the circuit board and the antenna can be canceled,” say the researchers.

The transceiver was fabricated using an inexpensive, mass-produced silicon CMOS[6] Technology that takes up an area of ​​only 16 mm2. The researchers believe the new circuit can be installed in a wide variety of applications that 5G will enable in the future. What is important is that your transceiver improves spectrum efficiency while minimizing device size and setup costs.

The results will be presented at the 2020 Symposia on VLSI Technology and Circuits (VLSI 2020), which will take place online from June 14th. The paper was also selected as one of the technical highlights of the conference.


This research is supported by Japan’s Ministry of Internal Affairs and Communications (JPJ000254).

Technical terms

[1] Phased-Array: Description of an electrically controllable antenna array.

[2] Dual-polarized MIMO: Dual-polarized multiple-input-multiple-output (MIMO) is an antenna system for wireless communication that can improve transmission capacity by using multiple antennas that transmit signals at the same time.

[3] Cross polarization leakage: A type of signal leakage caused by horizontally and vertically polarized signals that interfere with each other.

[4] Error vector magnitude: A measure of the level of interference calculated from the difference between the ideal signal sent and the signal actually received.

[5] 256QAM: The highest digital modulation method for converting digital data into radio waves and electrical signals.

[6] CMOS: Complementary Metal Oxide Semiconductor, the main processing method used to create integrated circuits.


Technology Session (Video): CF2 – RF and MM Wave Circuits

Session Title: A 28 GHz CMOS phased array beamformer that supports dual polarized MIMO with cross polarization leak suppression

Authors: Pang, J. et al.

Conference: 2020 Symposia on VLSI Technology and Circuits


1 Faculty of Electrical Engineering and Electronics, Tokyo Institute of Technology, Tokyo, Japan

2 NEC Corporation, Kawasaki, Japan

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Kenichi Okada HP

About the Tokyo Institute of Technology

Tokyo Tech is at the forefront of research and higher education as the leading university in science and technology in Japan. Tokyo Tech researchers excel in areas that range from materials science to biology, computer science and physics. Tokyo Tech was founded in 1881 and is home to over 10,000 undergraduate and graduate students annually who develop into scientific leaders and some of the most sought-after engineers in the industry. The Tokyo Tech Community embodies the Japanese philosophy of “Monotsukuri”, which means “technical ingenuity and innovation”, and strives to contribute to society through effective research.

About the NEC Corporation

The NEC Corporation has established itself as a leader in the integration of IT and network technologies, while promoting the brand statement “Orchestrating a brighter world”. NEC enables companies and communities to adapt to rapid changes in society and the market, as it takes into account the social values ​​of security, fairness and efficiency in order to promote a more sustainable world in which everyone has the chance to reach their full potential. For more information, please visit NEC at

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