Signal transceiving device, method and communication equipment based on OFDM phase conjugated subcarrier

Abstract

The present invention relates to a signal transmitting and receiving device, method and communication equipment based on OFDM phase conjugated subcarriers. The signal transmitting device includes: a baseband signal generation module, which is used to obtain two channels of first baseband information according to a binary information sequence to be transmitted Sequence; a baseband signal modulation module, configured to obtain two optical signals according to the two first baseband information sequences; and an optical signal transmitting module, configured to transmit the two optical signals. The signal receiving device includes: an optical signal receiving module for receiving two parallel optical signals emitted by the transmitter; a signal processing module for obtaining two second baseband information sequences according to the two optical signals; a signal recovery module , used to obtain the final binary information sequence according to the two second baseband information sequences. The transmitting device and the receiving device can effectively eliminate various phase noise effects in the transmission process by introducing phase conjugated subcarriers into the parallel transmission link.

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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