TDCS (Transform Domain Communication System) multi-access improvement method based on sequence design

A sequence design and sequence technology, which is applied in the field of improvement of tDCS multiple access based on sequence design, can solve the problems of fierce competition in the use of other frequency bands, underused spectrum, and poor wireless spectrum resources, etc.

Active Publication Date: 2016-12-14
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

Due to the rapid development of the communication industry, the problem of poor wireless spectrum resources is becoming more and more serious, however, the spectrum in mos

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  • TDCS (Transform Domain Communication System) multi-access improvement method based on sequence design
  • TDCS (Transform Domain Communication System) multi-access improvement method based on sequence design
  • TDCS (Transform Domain Communication System) multi-access improvement method based on sequence design

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Embodiment Construction

[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0045] At the sending end, the original random phase sequence is first generated, and then expanded into a set of sequences through spread spectrum. At the same time, a set of frequency energy efficiency sequences is obtained by sensing the surrounding electromagnetic environment. This set of sequences sets the occupied frequency band to 0, so it can be actively avoided. interference frequency band. According to the method described above, the required random phase is generated, multiplied by the spectrum energy efficiency sequence, and then the required basic modulation waveform FMW can be obtained after scaling and IFFT; then the data is modulated to the FMW by CCSK, and finally passed The transmitting module transmits the generated signal.

[0046]At the receiving end, first perform conventional reception, complete channel estimation and equalization at t...

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Abstract

The invention belongs to an improvement scheme of a TDCS (Transform Domain Communication System) based on sequence design, introduces a good correlation characteristic sequence and a spread spectrum structure, and is especially applicable to a multi-access system needing to satisfy a large number of users. The invention provides a TDCS improvement method based on the sequence design and capable of improving a multi-access capability. Under the condition of keeping the advantages, the good correlation sequence which is directly optimized for a periodic correlation characteristic is named a Minimizer for Periodic Integrated Sidelobe Level (MIPSL), as an initial phase sequence, element-by-element multiplication is carried out on the initial phase sequence and the spread spectrum sequence, thereby expanding the initial phase sequence into a sequence set, and the sequence set is allocated to different users.

Description

technical field [0001] The invention belongs to the improvement scheme of the Transform Domain Communication System (TDCS, Transform Domain Communication System) based on the sequence design, and introduces a good correlation characteristic sequence and a spread spectrum structure, and is especially suitable for a multiple access system that needs to satisfy a large number of users. Background technique [0002] As we all know, wireless spectrum is a precious natural resource in radio communication, which is generally allocated in a fixed way and authorized by government agencies. Due to the rapid development of the communication industry, the problem of poor wireless spectrum resources is becoming more and more serious. However, the spectrum in most frequency bands is not fully used. This results in some frequency bands not being used by any users most of the time, while competition for other frequency bands is relatively intense. In order to solve the above problems, cogn...

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Application Information

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IPC IPC(8): H04L5/00H04L27/227H04B1/707H04B1/7097
CPCH04B1/707H04B1/7097H04L5/0037H04L27/2278
Inventor 胡苏郭惠婷黄驿轩柴胜均石荣刘志国
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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