Method and system for realizing multi-user spread spectrum communication

A technology of spread spectrum communication and implementation method, which is applied in the field of ultraviolet light communication, can solve problems such as communication quality degradation, achieve the effects of strong security and anti-interference ability, save spectrum resources, and reduce system bit error rate

Inactive Publication Date: 2013-10-23
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Method and system for realizing multi-user spread spectrum communication
  • Method and system for realizing multi-user spread spectrum communication
  • Method and system for realizing multi-user spread spectrum communication

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Embodiment 1

[0039] Such as figure 1 As shown, this embodiment records a method for implementing multi-user spread spectrum communication, which includes the following steps:

[0040] S1: The transmitting end performs direct sequence spread spectrum modulation on multiple different user information by using multiple different and mutually orthogonal PN sequence codes, and changes the digital signal duty cycle of different users after spread spectrum modulation;

[0041] S2: The digital signal after spread spectrum modulation is converted into an optical signal by the ultraviolet light source and sent to the receiving end through the ultraviolet carrier;

[0042] S3: The receiving end converts the received optical signal into an analog electric signal, and converts the analog electric signal into a digital electric signal;

[0043] S4: Perform average filtering on the digital electrical signal, restore the signal duty cycle, and perform direct sequence despreading to determine which user the receive...

Embodiment 2

[0052] Such as Figure 4 As shown, this embodiment records a multi-user spread spectrum communication system, including a sending end and a receiving end;

[0053] The transmitting end digital signal processing module is used to perform direct sequence spread spectrum modulation on multiple different user information, change the signal duty cycle, and transmit the modulated digital signal to the ultraviolet LED driving circuit;

[0054] The ultraviolet LED driving circuit is used to convert the modulated digital signal level value into a current value, and drive the light source ultraviolet LED array to emit light;

[0055] The light source ultraviolet LED array is used to convert the modulated digital signal into an optical signal and transmit it to the receiving end through an ultraviolet carrier wave;

[0056] The receiving end includes: an ultraviolet detector, an A / D converter, and a receiving end digital signal processing module;

[0057] The ultraviolet detector is used to conve...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04B10/11
Inventor 韩大海焦璐张民
Owner BEIJING UNIV OF POSTS & TELECOMM
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