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

Union resource distributing method of improved-type multi-user OFDM (orthogonal frequency division multiplexing) DF (decoding-forwarding) system

A resource allocation, multi-user technology, applied in multi-frequency code systems, wireless communications, electrical components, etc., can solve the problems of limiting system performance, not making full use of idle sub-carrier spectrum resources, and reducing computational complexity.

Inactive Publication Date: 2012-10-10
SHANGHAI JIAO TONG UNIV
View PDF3 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, all these joint resource allocation schemes are based on the assumption of traditional relay cooperation, that is, the second time slot only allows relay nodes to forward transmissions, but since in DF relay cooperative networks, relays do not does not participate in forwarding, so the above schemes do not make full use of the idle subcarrier spectrum resources of the second time slot, which obviously limits the improvement of system performance to a certain extent

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
  • Union resource distributing method of improved-type multi-user OFDM (orthogonal frequency division multiplexing) DF (decoding-forwarding) system
  • Union resource distributing method of improved-type multi-user OFDM (orthogonal frequency division multiplexing) DF (decoding-forwarding) system
  • Union resource distributing method of improved-type multi-user OFDM (orthogonal frequency division multiplexing) DF (decoding-forwarding) system

Examples

Experimental program
Comparison scheme
Effect test

example

[0149] figure 1 In the improved OFDM DF relay channel with multiple users, the relay R assists the source S to send the signal to the user D by first decoding and then forwarding the received signal. k (k=1,...,K) transmission signal. The system completes a complete signal transmission in two time slots. The specific steps are as follows:

[0150] (1) Based on the instantaneous state information, the central unit of the system obtains the optimal resource allocation strategy that can be obtained by the current channel state by solving the optimization problem of the end-to-end throughput of the system And use this to judge and switch the relay mode of the system;

[0151] (2) In the first time slot, S broadcasts information to all other nodes according to the current optimal resource allocation strategy, and R and K users receive it at the same time;

[0152] (3) In the second time slot, the system switches the relay mode according to the current optimal resource allocatio...

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 union resource distributing method of an improved-type multi-user OFDM (orthogonal frequency division multiplexing) DF (decoding forwarding) system, wherein a relay station assist information source with a DF (decoding-forwarding) mechanism communicates with a plurality of users; the union resource distribution of the system is realized through a dual-time-clearance transmission mode, comprising system subcarrier matching, subcarrier pair-user distribution as well as subcarrier power distribution; based on the analysis of channel state information by a pivot control unit, the system working mode switching is realized; and when a certain subcarrier of the system is in the idle mode, an idle subcarrier of an information source second time clearance is allowed to be transmitted additionally. Compared with the traditional OFDM based multi-user relay cooperative system, the method provided by the invention effectively overcomes the defect that a relay subcarrier of the traditional OFDM system can not be fully utilized at the second time clearance and obviously improves the frequency spectrum frequency.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to an improved multi-user OFDM DF system joint resource allocation method, that is, a multi-user downlink joint resource allocation technology based on OFDM modulation and improved DF relay cooperation. Background technique [0002] With the rapid development of wireless technology and the continuous popularization of wireless applications, people's demands and expectations for diversified communication services are also increasing day by day. In order to make wireless communication systems have higher reliability and higher spectrum Non-ideal characteristics such as fading and intersymbol interference caused by communication range and more complex and diverse communication environments are particularly important. The direct solution is to use wireless transmission technology with higher spectrum efficiency and stronger anti-multipath interference ability in the wireles...

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): H04L27/26H04W72/04
Inventor 刘永陈文
Owner SHANGHAI JIAO TONG UNIV
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