Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method and apparatus of a multiple-access communication system

A communication system and simultaneous communication technology, applied in multi-carrier systems, transmission systems, wireless communications, etc.

Active Publication Date: 2011-11-02
HUAWEI TECH CO LTD
View PDF3 Cites 34 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The values ​​of the non-zero elements of the prior art are randomly generated

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
  • Method and apparatus of a multiple-access communication system
  • Method and apparatus of a multiple-access communication system
  • Method and apparatus of a multiple-access communication system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] To generate a signature sequence, the straightforward solution is to generate n user-specified phases at a time by computer trial and error to produce the lowest information transmission bit error rate, or to generate n user-specified phases in an online manner, where each time the user transmits data , the transmitter generates a new random signature sequence. This is usually done in a pseudo-random manner, with the receiver knowing the signature sequence at all times.

[0025] However, a problem related to the performance of systems applying such low-density signature sequences aimed at detecting BP detection methods is that such random or trial-and-error generated signature sequences can lead to unpredictable performance, with the result that different users may rely on Experience different performances depending on the star position of the signature sequence and the special matrix structure.

[0026] In overload conditions, there are more signature sequences than c...

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

Method and apparatus of a multiple-access communication system for simultaneous communication with a plurality of user entities are disclosed. Signature sequences are used to discriminate between signals to and / or from various user entities. In an example matrix representation, signature-sequences are describable as elements of a column of a signature-sequence matrix, said signature-sequence matrix being a low-density matrix and a matrix wherein non-zero elements of any single row of the matrix constitute distinct elements of a finite set of elements.

Description

technical field [0001] The invention relates to communication of a plurality of user entities of a multiple access communication system. In particular it concerns the identification between signals, communication sessions or connections in such systems related to various user entities through signature sequences. Background technique [0002] Information symbol spreading is a common method to achieve frequency diversity through multipath frequency selective fading propagation channels. It is also a method of providing simultaneous multiple access to multiple users (user entities) using a shared communication channel. Spread spectrum communication systems with multiple access functions based on user-specific spreading codes are generally referred to as code division multiple access (CDMA) systems (spreading codes are also commonly referred to as spreading signatures or signature sequences, but hereinafter "signature sequences " is used as a generic term for such codes / seque...

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): H04W74/00
CPCH04L5/0016H04L27/34H04L27/18
Inventor 布兰尼斯拉夫·波波维奇雅普·范德比克
Owner HUAWEI TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com