Two-dimensional multi-antenna cancellation method of broadband full-duplex system

Abstract

The invention discloses a two-dimensional multi-antenna cancellation method of a broadband full-duplex system. MN pairs of transmitting antennas are added for self-interference cancellation of a phase cancellation. The MN pairs of the transmitting antennas and a receiving antenna form a circular antenna arrangement structure at a near-end full-duplex node of the broadband full-duplex system, the receiving antenna is located at the center of the circle, the transmitting antennas are arranged on M concentric circles with the receiving antenna serving as the centers of the circles, and each two are arranged in pair on a diameter, the distance from one in each pair to the center of the circle is d, and the distance from the other in each pair to the center of the circle is d+[lamda]i / 2 (i=1, 2, ... , M), that is to say, the length of one path differs from the other path by odd times of a half of a signal carrier wave length, and the phase differences are mutually cancelled. Sent signals at the transmitting antennas are firstly divided into M narrow frequency bands by a filter bank having adjacent sub-bands and having an odd symmetry characteristic, then are divided into MN parts by a power divider, and are sent out at the same time and same frequency, the self-interference signals are mutually cancelled and superposed at the receiving antenna, and the interference on the useful signals of the receiving end is reduced significantly.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to the field of self-interference cancellation of a full-duplex communication system, in particular to a two-dimensional antenna cancellation method of a broadband full-duplex system. The method can realize the elimination of the self-interference signal during the sending and receiving process of the broadband signal in the full-duplex communication system, so that the sending and receiving can have higher quality. Background technique [0002] The history of human wireless communication is not long, but it has been developing by leaps and bounds, and the use of wireless devices is becoming more and more common today. The ever-increasing demand for wireless multimedia services and limited wireless spectrum resources, as well as the increasing demand of users for wireless network speed and reliability, make people more and more focused on the development of higher transm...

AI Technical Summary

Problems solved by technology

However, this patent utilizes that when the distance between each pair of transmitting antennas differs by an odd multiple of half the wavelength, the phase of the signal is reversed to complete the cancellation, which leads to the fact that the patent is only applicable to narrowband communication, and its cancellation performance will be greatly reduced in broadband situations

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