Communication system, communication method, multichannel adaptive equalizer and OFDM (orthogonal frequency division multiplexing) signal demultiplexing method

Abstract

The invention discloses a communication system, a communication method, a multichannel adaptive equalizer and an OFDM (orthogonal frequency division multiplexing) signal demultiplexing method. The OFDM signal demultiplexing method includes the steps: receiving OFDM optical signals multiplexed by N-channel optical subcarrier waves, demodulating the OFDM optical signals by respectively using series intrinsic light different in angular frequency so as to obtain corresponding OFDM electrical signals; and after adjacent frequency band signals except for baseband signals are subjected to attenuation of a low-pass filter, sampling the OFDM electrical signals in each channel so as to obtain corresponding OFDM electrical signal sampling values, and then reducing data carried by the corresponding optical subcarrier waves in each channel by using a multichannel balance matrix to multiply by the N-channel OFDM electrical signal sampling values. The OFDM signal demultiplexing method has the advantages that a receiving end does not require strict match of sampling time of signal demodulation in each channel, sampling rate is determined by modulating signal rate carried by single optical carrier wave, ADC (analog-to-digital converter) bottleneck restriction can be bypassed, and the method is applicable to the high-speed optical communication system.

Description

technical field [0001] The invention relates to a communication system, in particular to a communication system, a communication method, a multi-channel self-adaptive equalizer and a method for demultiplexing OFDM signals. Background technique [0002] The high-speed development of optical communication mainly involves two technical routes: time division multiplexing (TDM) and wavelength division multiplexing (WDM). Time division multiplexing is to interweave different signals in different time periods, transmit them along the same channel, and then extract the signals in each time period at the receiving end and restore them to the original signal. At present, coherent optical communication technology and Polarization multiplexing QPSK (Quadrature Phase Shift Keying) modulation can achieve a single-wavelength 100G transmission rate, but this solution requires the use of an analog-to-digital converter with a sampling rate of tens of G at the receiving end, because this is cl...

AI Technical Summary

Problems solved by technology

Therefore, at present, the discrete Fourier transform method is used to process OFDM signals, and its receiving rate is the same as that of single carrier, which is still limited by the ADC sampling rate.

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