Self-Interference Cancellation-Based Mutual-Coupling Model for Full-Duplex Single-Channel MIMO Systems

Abstract

The challenge of a full-duplex single-channel system is the method to transmit and receive signals simultaneously at the same time and on the same frequency. Consequently, a critical issue involved in such an operation is the resulting self-interference. Moreover, for MIMO system, the full-duplex single-channel system is subjected to the very strong self-interference signals due to multiple transmitting and receiving antennas. So far in the pieces of literature, there have not been any suitable techniques presented to reduce the self-interference for full-duplex single-channel MIMO systems. This paper initially proposes the method to cancel the self-interference by utilizing the mutual-coupling model for self-interference cancellation. The interference can be eliminated by using a preknown interference, that is, the mutual-coupling signals. The results indicate that the channel capacity performance of the proposed technique can significantly be improved due to the reduction of the self-interference power. The measurement results indicate that the proposed MIMO system can suppress the self-interference and mutual-interference signals with the reduction of 31 dB received power.

Self-mixed self-interference analog cancellation in full-duplex communications

“…Besides, full-duplex mode has advantages in overcoming thorny problems, such as hidden terminals, high end-to-end delays [1], and spectrum sensing in cognitive radio [2]. Due to these significant advantages, full-duplex communications have been attracting an increasing amount of research interest [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

“…[4] presented a different approach that follows path #2. Since then, the two approaches have dominated the development of full-duplex communications [1,[4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

Performance gains from directional antennas in full-duplex systems

“…However, the loop channel may be severely affected by multiple reflections and diffractions on a number of scatterers, which would question our assumptions on the AoDs and AoA. This part of the channel effect could be mitigated by a traditional MIMO approach, as for example described in [13]. However, in the case where MIMO antennas are used for creating directional patterns, the aforementioned approach gives additional insight since it involves the antenna radiation patterns.…”

Performance analysis of MB-MIMO under 120 degree sector consideration for 5G communications

“…Another major element of any 5G cellular system will be that of multiple antennas. Using these it will be possible to alter the beam direction to enable more direct communications and limit interference and increase overall cell capacity [2][3][4].…”