Full‐duplex MIMO system based on antenna cancellation technique

Abstract

The performance of an antenna cancellation technique for a multipleinput-multiple-output (MIMO) full-duplex system that is based on null-steering beamforming and antenna polarisation diversity is investigated. A practical implementation of a symmetric antenna topology comprising three dual-polarised patch antennas operating at 2.4 GHz is described. The measurement results show an average of 60 dB self-interference cancellation over 200 MHz bandwidth. Moreover, a decoupling level of up to 22 dB is achieved for MIMO multiplexing using antenna polarisation diversity. The performance evaluation of the proposed technique was performed by simulation and measurement and the results have good agreement.

Dynamic Spectrum Sharing in 5G Wireless Networks With Full-Duplex Technology: Recent Advances and Research Challenges

“…On the other hand, the third approach suppresses the SI due to separation between the main lobes of transmit and receive antennas caused by their directive beampatterns. Besides, polarization decoupling between transmit and receive antennas by operating them in orthogonal polarization will further improve the capability of SI suppression capability [80]. In this regard, authors in [80] Analog cancellation can be developed by using the time-domain cancellation algorithms such as training-based methods which can estimate the SI leakage in order to facilitate the SI cancellation [20].…”

“…Besides, polarization decoupling between transmit and receive antennas by operating them in orthogonal polarization will further improve the capability of SI suppression capability [80]. In this regard, authors in [80] Analog cancellation can be developed by using the time-domain cancellation algorithms such as training-based methods which can estimate the SI leakage in order to facilitate the SI cancellation [20]. Furthermore, in MIMO systems, the increased spatial degrees of freedom provided by the antenna may be utilized to provide various new solutions for SI cancellation.…”

Co‐polarized monostatic antenna with high Tx–Rx isolation for 2.4 GHz single channel full duplex applications

“…For instance, such co‐polarized monostatic antenna can be used to implement full duplex systems for military applications to offer possibility of simultaneous monitoring and jamming a frequency band . Such antennas are also very useful to realize full duplex multiple‐input‐multiple‐output (FD‐MIMO) system . However, due to excitation of linear‐polarized identical modes (TM 01 or TM 10 ) on same radiating patch, it is challenging task to decouple T x –R x ports of co‐polarized monostatic patch antenna as compared with its dual polarized version where polarization diversity differentiates T x and R x signals through inherent interport isolation.…”

Dual-Polarized On-Chip Antenna for 300 GHz Full-Duplex Communication System

“…In a general way, there are three key mechanisms in the antenna domain. They are the directional isolation, absorptive shielding, and cross-polarization [4][5][6][7].…”