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One-dimensional superstructure terahertz CDMA (code division multiple access) system time domain encoder and decoder

A time-domain coding and terahertz technology, applied in the field of communication, can solve the problem of no-cost codec, etc., and achieve the effects of convenient parameter adjustment, simple structure and low cost

Inactive Publication Date: 2017-02-22
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

However, there has been a blank in the terahertz frequency band, and one of the important reasons is that there is no low-cost and reliable codec

Method used

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  • One-dimensional superstructure terahertz CDMA (code division multiple access) system time domain encoder and decoder
  • One-dimensional superstructure terahertz CDMA (code division multiple access) system time domain encoder and decoder

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Embodiment Construction

[0013] One-dimensional superstructure terahertz CDMA system time-domain encoder and decoder, working in the terahertz frequency band, such as figure 1 As shown, the coder and decoder are double-sided symmetrical one-dimensional metal grating plate structures, and the sorting order of the grating chips on the metal grating plate from the middle to both sides is determined according to the encoding and decoding order of the CDMA system, and the "0" code Corresponding to the unstructured metal plate, the "1" code corresponds to the equal-period double-sided coupling symmetrical grating groove chip, the period width p of the "0" code and the "1" code is the same, only the "1" code has grooves, and the groove Width w and groove depth t; the working center frequency and bandwidth of the terahertz CDMA system are respectively determined by the cycle width of the chip (center frequency f 0 =c / p, where c is the speed of light in vacuum, p concentric ring cycle width) and the number of ...

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Abstract

The invention relates to a one-dimensional superstructure terahertz CDMA (code division multiple access) system time domain encoder and decoder. Double-faced coupling symmetric superstructure plane gratings are symmetrically arranged on two sides of a center through groove of a metal plate, symmetric CDMA binary code chip sequences are arranged and assembled on double-faced coupling symmetric groove groups of two sides of the through groove, polarization directions of inputted terahertz waves are perpendicular to groove directions in a plane of the metal plate, terahertz pulses meeting specific work frequency bands are symmetrically coupled and enhanced on the metal surfaces by the aid of a surface plasma wave mode and spread to the center through groove, so that encoding or decoding are achieved in groove trapped wave structures of metal gratings, and the terahertz pulses emerge at the center through groove penetrating metal by the aid of a small divergence angle. The encoder and decoder are applicable to encoding or decoding of terahertz frequency band CDMA system time domains and have the advantages of low energy consumption and cost, simple structure, convenience in parameter adjustment and machining and the like.

Description

technical field [0001] The invention relates to a communication technology, in particular to a one-dimensional superstructure terahertz CDMA system time-domain coder and decoder. Background technique [0002] The CDMA system is a communication system based on code division (spread spectrum) technology and multiple access technology. The system assigns each user a specific address code. The address codes have mutual quasi-orthogonality, so that they can overlap in time, space and frequency; the information data to be transmitted is modulated in the time domain / frequency domain with a pseudo-random code, so that the time domain of the original data signal The domain / frequency domain width is expanded, and the receiving end performs the reverse process to perform despreading, which enhances the anti-interference ability. [0003] The CDMA communication network is composed of several technologies such as spread spectrum, multiple access and frequency multiplexing. Fading, high...

Claims

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Application Information

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IPC IPC(8): G02B5/18H04B10/516H04B10/60
CPCG02B5/1866H04B10/516H04B10/60
Inventor 袁明辉朱亦鸣
Owner UNIV OF SHANGHAI FOR SCI & TECH
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