Co-time co-frequency full-duplex single-antenna relay system based on fractal micro-strip coupler group

Abstract

The invention belongs to the technical field of radio transmission, and discloses a co-time co-frequency full-duplex single-antenna relay system based on fractal micro-strip coupler group. A single-port antenna is connected to an antenna port of a fractal micro-strip coupler group through a radio frequency cable. The fractal microstrip coupler group comprises three 50-ohm ports, namely an antennaend, a transmitting end and a receiving end. The system comprises an analog domain self-interference elimination module, utilizing a power divider to copy a transmission signal, reconstructing a reverse self-interference signal through a phase modulator and an amplitude modulator, and then converging the reverse self-interference signal to a received signal through a synthesizer to eliminate self-interference; a numerical control amplifier module used for adjusting the amplification coefficient of the relay amplifier in real time through the digital signal. Meanwhile, an amplification factor based on the maximum signal to interference plus noise ratio can be calculated and the amplification factor can be adjusted in combination with co-time co-frequency full duplex bidirectional relay cooperative communication. The relay system provided by the invention not only can widen the communication range and greatly improve the system capacity, but also greatly saves the frequency spectrum resources and improves the frequency spectrum efficiency when working in a full duplex mode.

Description

technical field [0001] The invention belongs to the technical field of radio transmission, and in particular relates to a simultaneous same-frequency full-duplex single-antenna relay system based on a fractal microstrip coupler group. Background technique [0002] At present, the closest existing technology: In the field of wireless communication, with the rapid development of information technology, communication and data transmission services are increasing rapidly, making electromagnetic wave communication spectrum resources increasingly crowded. In this context, full-duplex communication technology has been widely used and has become one of the key technologies in the field of wireless communication. Compared with the half-duplex relay system, each node of the full-duplex relay communication system can transmit and receive signals at the same frequency at the same time, which can double the spectrum efficiency and greatly increase the system capacity, thereby alleviating...

AI Technical Summary

Problems solved by technology

The following begins to describe the existing technology and its shortcomings: the existing technology uses a separate directional antenna for transceiver isolation to reduce the impact of self-interference signals on the received signal, the distance between the transceiver antennas is relatively long, and the overall system occupies a large area , poor mobility

Ferrite circulator packages are generally relatively large in size, which is not conducive to integrated design

[0006] (3) The existing single-antenna full-duplex system has relatively low transceiver isolation and poor self-interference cancellation capability

[0008] The traditional single-antenna transceiver isolation system is mostly implemented using a ferrite circulator, but it is difficult to design a wide-band, highly integrated new self-interference cancellation microstrip circuit

The impedance matching and phase cancellation process of the circuit is relatively complex, which is a challenge for the designer

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