A space-borne coherent laser communication diversity system based on mimo

Abstract

The present invention discloses a MIMO-based space-borne coherent laser communication diversity system, comprising: a transmitter host computer; an error correction encoder, the front end of the error correction encoder is connected to the transmitter host computer; a space-time encoder , the front end of the space-time encoder is connected to the rear end of the error correction encoder; phase modulator, the front end of the phase modulator is connected to the rear end of the space-time encoder; laser; telescope; interference filter Optical sheet; optical splitter; channel estimator, the channel estimator receives one way from the incident light of the optical splitter; combiner; local oscillator laser; demodulator, the front end of the demodulator and the rear of the photodetector connected to the end; an error correction decoder, the front end of the error correction decoder is connected to the back end of the demodulator; and a receiving end host computer, the receiving end host computer is connected to the back end of the error correction encoder end connected.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to a space-borne coherent laser communication diversity system based on MIMO. Background technique [0002] Coherent detection has advantages in receiving sensitivity. For the detection of weak signal strength such as space long-distance communication links, coherent detection has a greater improvement in communication rate and detection sensitivity than direct detection laser communication systems. In order to further improve the detection sensitivity, the diversity receiving technology is currently mainly used to use multiple optical antennas to receive optical signals at the receiving end. When the signals received by each branch are independent of each other, combining them properly can effectively improve the influence of the channel on the performance of the space communication system. . [0003] The traditional space-borne coherent laser communication diversi...

AI Technical Summary

Problems solved by technology

The traditional space-borne coherent laser communication diversity technology uses one transmission and multiple receptions to improve the receiving signal-to-noise ratio. In the space-borne laser communication scenario, the increase in the size and weight of the payload will increase the cost and difficulty of manufacturing the satellite.

For example, in the above example, the one-send-four-receive mode improves the receiving signal-to-noise ratio by four times compared with the one-send-one-receive mode, but the load carried by the satellite is also increased from one laser and one optical antenna to one laser and four Optical antennas increase the difficulty of satellite production Satellite cost and launch cost

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