Signal transmitting and receiving device based on OFDM phase conjugate subcarrier, and method thereof and communication equipment

Abstract

The invention relates to a signal transmitting and receiving device based on OFDM phase conjugate subcarrier and a method thereof and communication equipment, and the device comprises a baseband signal generation module which is used for obtaining two paths of first baseband information sequences according to a to-be-transmitted binary information sequence; a baseband signal modulation module is used for obtaining two paths of optical signals according to the two paths of first baseband information sequences; and an optical signal transmitting module used for transmitting the two paths of optical signals. The signal receiving device comprises an optical signal receiving module used for receiving two paths of parallel optical signals transmitted by a transmitting end; a signal processing module is used for obtaining two paths of second baseband information sequences according to the two paths of optical signals; and a signal recovery module is used for acquiring a final binary information sequence according to the two paths of second baseband information sequences. According to the transmitting device and the receiving device, the phase conjugate subcarriers are introduced into theparallel transmission link, so that various phase noise influences in the transmission process can be effectively eliminated.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a signal transceiving device, method and communication equipment based on OFDM phase-conjugated subcarriers. Background technique [0002] As a new type of communication technology, optical wireless communication has the advantages of both optical fiber communication and mobile communication. It can realize broadband transmission, flexible networking, no need for frequency application, anti-electromagnetic interference, and good confidentiality. With the explosive growth of the amount of data transmitted in modern networks, optical wireless communication systems featuring high bandwidth, high spectral efficiency, and rapid deployment have received extensive attention and research in military, commercial, industrial, and scientific research fields. [0003] At present, most of the traditional optical wireless communication systems are based on OFDM (Orthogonal Fr...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that there is an error between the frequency offset estimated by the pilot sequence that eliminates the inter-subcarrier interference and the frequency offset experienced by each data subcarrier, so that the phase still exists after the final frequency offset compensation Noise impact, system performance improvement is relatively small

[0004] The frequency offset and phase offset estimation method based on the pilot sequence used in the existing optical wireless communication system based on the OFDM modulation format cannot correct the carrier frequency synchronization error, the Doppler frequency shift caused by the mobile environment, and the instantaneous sampling error. Accurately estimate the frequency offset or phase offset of , so that there is a large error between the estimated value and the real value, so its performance improvement is very limited

In addition, the method based on the pilot sequence cannot estimate the phase noise that may exist in wireless optical channels (such as atmospheric turbulence channels, etc.), so its application range is limited

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