Quick signal processing method of OOFDM (optical orthogonal frequency division multiplexing) transceiver

Abstract

The invention discloses a quick signal processing method of an OOFDM (optical orthogonal frequency division multiplexing) transceiver. The quick signal processing method comprises the following steps of: sending and receiving signals; and when the signals are sent, performing serial/parallel conversion of the signals, automatic detection pseudo code addition of channels, bandwidth compression encoding, orthogonal multi-subcarrier generation, inverse Fourier transform, signal crest value interception and quantification, cyclic prefix addition and parallel/serial conversion. Transmitted OFDM signals subjected to photoelectric conversion generates digital electric OFDM signals through an analog-to-digital converter (ADC) at a corresponding receiving end, and a signal processing course opposite to that at an emitting end is performed on the synchronized electric OFDM signals to obtain transmission signals. During the signal processing course, the quick signal processing method disclosed by the invention utilizes the characteristics of a hermite symmetric structure to reduce the realization difficulty of the receiving end and the cost, and the quick signal processing method has a relatively strong self-adaptation capability.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a fast signal processing method of an optical orthogonal frequency division multiplexing OOFDM transceiver. Background technique [0002] The industrialization of Optical Orthogonal Frequency Division Multiplexing (OOFDM) technology will realize a leap in broadband network speed from megabit to gigabit. The installation and popularization of optical access network is internationally recognized as the cheapest, most effective and most forward-looking technical means to improve user bandwidth. The global optical communication market is growing at an annual rate of 70%. Optical Orthogonal Frequency Division Multiplexing (OOFDM), first invented by Professor Tang Jianming from the Department of Electronic Engineering at Bangor University in the UK in 2005, makes full use of the current mature fast digital signal processing and semiconductor device integration technology to tran...

AI Technical Summary

Problems solved by technology

[0003] In actual use, it is found that when OOFDM signals are received in the existing optical orthogonal frequency division multiplexing signal transmission and receiver, the optical downconverter adopts coherent reception, so the frequency offset between the local oscillator light and the optical carrier It is sensitive to phase noise, so the line width of the laser at the transmitting end and the laser at the receiving end is required to be extremely narrow, which increases the cost of the system, and it is necessary to use complex algorithms to track and control the frequency and phase of the laser generated by the laser at the receiving end. OFDM reception The frequency compensation and subcarrier recovery modules in the machine need to use complex algorithms to track and control the laser frequency and phase generated by the laser at the receiving end to eliminate the frequency difference and phase difference between the local oscillator light and the optical carrier, which increases the system implementation time. Difficulty and high requirements of the system on the device thereby increasing the cost of the transceiver