Real-time adaptive optical self-interference elimination system and method based on FPGA and STM32

Abstract

The invention provides a real-time adaptive optical self-interference elimination system and a real-time adaptive optical self-interference elimination method based on FPGA and STM32. The real-time adaptive optical self-interference elimination method comprises the following steps: a baseband real-time transceiving module completes real-time transmission of baseband OFDM signals; the up-down frequency conversion module completes conversion between the baseband of the signal and the working frequency band of the antenna to obtain a radio frequency signal of local communication information; a radio frequency signal of the local communication signal is copied into a reference signal, and is sent through a radio frequency antenna module; the radio frequency antenna module receives a radio frequency useful signal from another communication unit and a time-varying radio frequency self-interference signal of a transmitting antenna close to the receiving antenna; after the optical self-interference elimination module receives a useful signal and a self-interference signal, the amplitude and phase of a reference signal are adjusted through the self-adaptive control module, the reference signal and the self-interference signal are cancelled out through a balance photoelectric detector in the optical self-interference elimination module, and the useful signal after self-interference elimination is obtained; and the useful signal after elimination of the self-interference is converted to a baseband and then is sent to a receiving end.

Description

technical field [0001] The present invention relates to the field of microwave photonics and wireless communication technology, specifically, to a real-time self-adaptive optical self-interference cancellation system and method based on FPGA and STM32, and more specifically, to an in-band full-duplex wireless communication system Real-time adaptive optical self-interference cancellation system based on FPGA and STM32. Background technique [0002] With the rapid development of mobile communication technology, the 5G era of Internet of Everything has arrived. Explosive information exchange puts forward higher requirements on the transmission rate and transmission capacity of wireless communication systems. Since spectrum resources are limited, developing higher frequency bands and larger bandwidths will significantly increase system costs. Therefore, how to make full use of existing spectrum resources and improve spectrum utilization has become an urgent problem to be solved...

AI Technical Summary

Problems solved by technology

However, the execution speed of the algorithm using MATLAB is slow, the adaptability is poor, and it still does not involve real-time two-way communication between different communication units, so it cannot be really applied to the IBFD wireless communication system.

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