Long-short code estimation method of multi-speed long-short code direct sequence-code division multiple access signal

A technology of code division multiple access and long and short codes, which is applied in the field of parameter estimation of direct spread signals, can solve problems such as the inability to directly use multi-rate LSC-DS-CDMA signals, achieve simple and effective methods, reduce the amount of calculation, and reduce the algorithm effect of complexity

Active Publication Date: 2018-01-05
上海亿人通信终端有限公司
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have certain effects for simple direct spread si...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Long-short code estimation method of multi-speed long-short code direct sequence-code division multiple access signal
  • Long-short code estimation method of multi-speed long-short code direct sequence-code division multiple access signal
  • Long-short code estimation method of multi-speed long-short code direct sequence-code division multiple access signal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] The implementation steps of the present invention will be further described in detail below.

[0023] The method for estimating the length code of a multi-rate long code direct spread code division multiple access signal specifically comprises the following steps:

[0024] Step 1. Convert the multi-rate long-short code direct spread code division multiple access signal to the baseband signal by sampling at the chip rate of the spreading code, construct an instantaneous linear mixed signal model in blind separation, and obtain the compound signal of each user through Fast-ICA separation. Code snippets, as follows:

[0025] 1-1. Assuming that the carrier frequency of the multi-rate LSC-DS-CDMA signal whose total number of users is known is U, the received baseband signal is sampled at the chip rate of the spreading sequence, then the received signal is expressed as:

[0026]

[0027] Among them, n is the sampling time, 1≤n≤N, N is the length of the received signal; V ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a long-short code estimation method of a multi-speed long-short code direct sequence-code division multiple access signal. Firstly, according to the largest long scrambling code cycle and the smallest spreading code cycle of a received signal, the received signal is segmented twice to obtain a signal matrix, and according to a Fast-ICA algorithm, complex code fragments of all users are obtained through separation; then, with gradual reducing of information speeds, a user long-short code sequence is estimated, the complex code fragments obtained by separating the Fast-ICA algorithm are spliced to constitute a fuzzy sequence, a secondary delay multiplying method is adopted to remove sequence fuzziness and spreading code interference, and in combination of a cyclotomiccoset and three-order relevant characteristics and according to a characteristic information matching method, long interference code estimation corresponding to all users at the same speed is completed; meanwhile, relevant calculation estimates the short spreading code, and then through a similarity coefficient matrix, all the complex code fragments of the estimated users are removed till long-short code estimation of all the users is completed.

Description

technical field [0001] The invention belongs to the field of parameter estimation of direct spread signals in communication, in particular to a method for estimating length codes of multi-rate long and short code direct spread code division multiple access signals using short code spreading and long code scrambling. Background technique [0002] Direct sequence spread spectrum (DSSS) has the advantages of strong anti-interference ability, good concealment, and easy code division multiple access, etc., and has been widely used in military and civilian fields. [0003] With the continuous development of spread spectrum communication, the traditional DSSS technology has limited its application in high-speed data transmission due to the contradiction between processing gain and data rate. In order to provide better services and applications, multi-rate direct sequence spread spectrum technology is introduced in spread spectrum communication. The direct spread code division mult...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H04B1/7156H04J13/00
Inventor 强芳芳赵知劲顾骁炜杨安锋尹辉张笑菲毛翊君姜显扬
Owner 上海亿人通信终端有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap