High carrier-to-noise ratio optical carrier wireless system and method based on spectrum vector signal processing

Abstract

The invention discloses a high carrier-to-noise ratio optical carrier wireless system and method based on spectrum vector signal processing. The system and the method comprise a tunable continuous wave laser, a phase modulator, a spectrum vector signal processor, a photoelectric diode and a radio frequency signal source. The phase modulator is used for modulating to-be-transmitted microwave signals generated by the radio frequency signal source to optical carriers generated by the tunable continuous wave laser, thus forming phase modulation optical signals. Amplitudes and phases of different optical sidebands of the phase modulation optical signals are displayed as program set specified values by using the spectrum vector signal processor according to program settings, thus forming processed modulation optical signals. Photoelectric conversion is carried out on the processed modulation optical signals by using the photoelectric diode, thus recovering the microwave signals. The microwave signals are output. According to the system and the method, the direct current drifting problem in the optical carrier wireless system can be eliminated; the high carrier-to-noise ratio of the system can be further improved; the system is simple in structure; and the system and the method have relatively high practical value.

Description

technical field [0001] The invention relates to the technical field of wireless over optical, in particular to an optical wireless system and method with high carrier-to-noise ratio based on spectral vector signal processing. Background technique [0002] Wireless over fiber technology is considered to be a good solution for broadband wireless access networks working in the millimeter wave band in the future because it combines the advantages of optical fiber communication with high bandwidth, low loss, anti-electromagnetic interference, and wireless communication with mobility and flexible access. . In wireless over fiber systems, compared with the traditional intensity modulation-direct detection scheme, the phase modulation scheme has been increasingly popular in recent years because the phase modulation scheme does not have the problem of link deterioration caused by DC drift. Many developers of all ages. As we all know, the radio frequency signal is loaded onto the op...

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Problems solved by technology

[0006] The present invention provides a high carrier-to-noise ratio light-borne wireless system and method based on spectral vector signal processing to solve the problem of DC drift of existing light in wireless systems and the technical problem of low carrier-to-noise ratio caused by low energy utilization efficiency of the system

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