Method and system for realizing multi-user spread spectrum communication

Abstract

The invention discloses a method for realizing multi-user spread spectrum communication. The method comprises the steps of S1, performing direct sequence spread spectrum modulation on multi-user information by adopting multiple different mutually-orthogonal PN sequence codes through a sending end, and changing the duty cycle of digital signals after the spread spectrum modulation of different users; S2, converting the digital signal subjected to the spread spectrum modulation into optical signals by an ultraviolet light source, and sending the optical signals to a receiving end by ultraviolet carriers; S3, converting the received optical signals into analog electric signals by the receiving end, and converting the analog electric signals into digital electric signals; and S4, performing average value filtering on the digital electric signals, recovering the signal duty cycle, performing direct sequence despreading and judging the user of the received user information. The invention also discloses a system for multi-user spread spectrum communication. The method for realizing multi-user spread spectrum communication can greatly improve the multi-user communication quality, has strong confidentiality and antijamming performance, and realizes the high integration of the multi-user spread spectrum communication.

Description

Technical field [0001] The present invention relates to the field of ultraviolet light communication, in particular to a method and system for implementing ultraviolet light multi-user spread spectrum communication based on FPGA. Background technique [0002] Wireless spectrum resources are tight, and the introduction of ultraviolet light communication is a huge expansion of the communication spectrum. The increasing number of network users makes the wireless spectrum increasingly crowded. In the era of rapid development of communication technology, the quality of communication has also attracted more and more attention. Spectrum spreading technology can improve the confidentiality and anti-noise ability of communication. Therefore, spectrum spreading technology has been developed. [0003] FPGA is rich in logic units, high in integration, and flexible in configuration. Multi-user spread spectrum communication systems need to complete fast and complex signal processing. FPGAs wi...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention: how to provide a multi-user spread spectrum communication implementation method to overcome the technical problem of communication quality degradation caused by the increasing number of network users in the prior art; and provide a multi-user spread spectrum communication implementation method The system can enable the receiving end to accurately receive information sent by multiple users and correctly determine which sending end user the information comes from, thereby improving communication quality

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