Supercharge Your Innovation With Domain-Expert AI Agents!

Mutual-complementing code CDMA (Code Division Multiple Access) system of time-frequency mixing separation sub-code structure

A technology for separating sub-codes and complementary codes, applied in transmission systems, electrical components, etc., can solve problems such as performance degradation of CC-CDMA systems

Inactive Publication Date: 2015-05-13
HARBIN INST OF TECH
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When selective fading also occurs within the bandwidth of each subcarrier, that is, when the coherent bandwidth of the channel is smaller than the bandwidth of each subcarrier, these detection algorithms will no longer be applicable, and the corresponding CC-CDMA system performance will also be affected by multiple access and multipath interference worsened by the influence of

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
  • Mutual-complementing code CDMA (Code Division Multiple Access) system of time-frequency mixing separation sub-code structure
  • Mutual-complementing code CDMA (Code Division Multiple Access) system of time-frequency mixing separation sub-code structure
  • Mutual-complementing code CDMA (Code Division Multiple Access) system of time-frequency mixing separation sub-code structure

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0048] Specific implementation mode 1. Combination Figures 1 to 6 Describe this specific implementation mode, a complementary code CDMA system with a time-frequency hybrid separation subcode structure,

[0049] The signal transmission process of the transmitter:

[0050] Taking the sending process of user k as an example, the transmitter structure is as follows figure 1 and 2 As shown, the sending process mainly includes the following steps:

[0051] Step 1. Data b of user k (k) After copying W shares, respectively enter W subcarrier spreading modules corresponding to W groups of subcodes, such as figure 1 shown.

[0052] Step 2, W subcarrier spreading modules respectively adopt a corresponding group of subcodes to spread the data of user k, taking the first subcarrier spreading module as an example, the process is as follows figure 2 As shown, the signal structure after spreading is as follows image 3 shown. Indicates the jth data sent by user k in a data block,...

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 relates to a mutual-complementing code CDMA (Code Division Multiple Access) system of a time-frequency mixing separation sub-code structure, relates to a mutual-complementing code CDMA system, and aims to reduce multipath interference in a sub-band of each subcarrier in a communication system. The signal transmission process comprises the following steps of replicating data of a user k into W parts, W subcarrier spread spectrum modules respectively adopting a set of corresponding sub-codes to spread the data of the user k and respectively modulating onto W subcarriers, and then superposing W subcarriers and sending the subcarriers to a wireless channel. The signal reception process comprises the following steps that a receiver respectively demodulates the data on W sub-carriers, W sub-carrier despreading modules respectively despread the signals spreaded by each sub-code on each path by using the corresponding sub-code, and decision is carried out to output after three combinations. The invention is suitable for wireless communication occasions.

Description

technical field [0001] The invention relates to a complementary code CDMA system. Background technique [0002] Among many related technologies of cellular wireless communication, multiple access technology is one of the core physical layer technologies, which fundamentally determines the way of multi-user and multi-channel sharing of wireless resources in the communication system, and the choice of this way is also Ultimately, the quality of service provided to end users is significantly affected. Therefore, the development of multiple access technology marks the evolution of cellular mobile communication systems from generation to generation: from the first generation of analog mobile communication systems using frequency division multiple access (FDMA) to the second generation of GSM systems using time division multiple access (TDMA) And the IS-95 system that uses narrowband Code Division Multiple Access (CDMA), to the third generation system that widely uses wideband CD...

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
Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/711
Inventor 孟维晓孙思月陈晓华
Owner HARBIN INST OF TECH
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com