Synchronizing signal transmitting-receiving device and method based on faster than Nyquist filtering

Abstract

The invention discloses a synchronizing signal transmitting-receiving device and method based on faster than Nyquist filtering. The method comprises the following steps: performing faster than Nyquistfiltering on a plurality of paths of input synchronizing signals at a transmitting end, and aggregating a plurality of paths of filtering signals into one path of high-speed aggregation signal; amplifying the obtained aggregation signal; modulating the amplified aggregation signal into an optical signal and transmitting the optical signal; converting the received optical signal into an electricalsignal at a receiving end to obtain one path of aggregation signal; amplifying the obtained aggregation signal; and decomposing one path of amplified high-speed aggregation signal into a plurality ofpaths of signals, and performing faster than Nyquist decoding on each path of signal respectively to obtain a plurality of paths of synchronizing signals. Through adoption of the synchronizing signaltransmitting-receiving device and method, the transmission and receiving of a plurality of paths of high-speed synchronizing signals are realized; partial overlapping of synchronizing signal spectrums of adjacent channels is supported; and high spectrum efficiency is achieved. Moreover, inter-channel crosstalk caused by spectrum overlapping is lowered effectively through faster than Nyquist filtering; the implementation way is simple; and the calculation complexity is relatively low.

Description

technical field [0001] The invention relates to the technology of sending and receiving synchronous signals, in particular to a device and method for sending and receiving synchronous signals based on super-Nyquist filtering. Background technique [0002] The transmission and reception of high-speed synchronous signals are usually applied in multi-user optical transmission systems. A high-speed synchronous signal implementation method is to map multiple signals to different subcarriers of OFDM (orthogonal frequency division multiplexed) symbols in the frequency domain, and then send them through optical OFDM signals based on direct modulation and direct detection. Realize synchronous transmission and reception of multi-channel signals with the receiving device; moreover, due to the orthogonality of OFDM subcarriers, the multi-channel signals do not need to consider the guard interval when mapping in the frequency domain. [0003] Nevertheless, with the continuous increase o...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that when the spectral overlap of two adjacent signals is used to improve the spectrum utilization rate in the frequency domain mapping process, the crosstalk between channels will reduce the transmission performance of the system to a certain extent

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