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Two-dimensional buphthalmos structure terahertz CDMA system time-domain encoder and decoder

A time-domain coding and terahertz technology, which is applied in the field of signal processing, can solve the problem of no-cost coder/decoder, etc., and achieve the effect of convenient parameter adjustment, simple structure and low cost

Inactive Publication Date: 2016-11-23
UNIV OF SHANGHAI FOR SCI & TECH
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  • Application Information

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Problems solved by technology

However, there has been a blank in the terahertz frequency band. One of the important reasons is that there is no low-cost and reliable coder / decoder.

Method used

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  • Two-dimensional buphthalmos structure terahertz CDMA system time-domain encoder and decoder
  • Two-dimensional buphthalmos structure terahertz CDMA system time-domain encoder and decoder

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Embodiment Construction

[0014] The present invention proposes a time-domain encoder and decoder of a two-dimensional bull's-eye structure terahertz CDMA system. The encoder and decoder work in the terahertz frequency band, such as figure 1 The two-dimensional bull's-eye structure terahertz CDMA system time-domain encoder and decoder are shown in the top view and section diagram. From the top view, the encoder and decoder are composed of concentric rings from the center to the periphery. Looking at the corresponding section, the rings The sequence is determined according to the coding or decoding sequence of the CDMA system (the "0" code corresponds to the unstructured metal plate, the "1" code corresponds to the concentric ring groove, the "0" code and the "1" code The period width p is the same, only the "1" code has grooves, groove width w and groove depth t); the working center frequency and bandwidth of the terahertz CDMA system are respectively determined by the period width of the chip (center f...

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Abstract

The invention relates to a two-dimensional bull's-eye structure terahertz CDMA system time-domain encoder and decoder, characterized in that the encoder and the decoder are circular metal grating plates with two-dimensional bull's-eye structure that are fully coupled and symmetrical on both sides. The center of the ring metal grating plate is a circular through hole, and the upper and lower surfaces of the ring metal grating plate are provided with coupling symmetrical two-dimensional concentric periodic rings. The groove width and groove depth of each symmetrical concentric ring groove are the same. The arrangement of rings arranged concentrically and periodically from the center to the periphery of the ring metal grating plate is based on the time-domain binary sequence of the CDMA system. The "1" code corresponds to the concentric ring groove, and the "0" code corresponds to the metal plate without structure. It is suitable for the time domain of the CDMA system in the terahertz segment. This structure has the advantages of extremely low energy loss, simple structure, convenient parameter adjustment, convenient processing, and low cost.

Description

technical field [0001] The invention relates to a signal processing technology, in particular to a two-dimensional bull's-eye structure terahertz CDMA system time-domain encoder 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. ...

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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