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

MIMO wireless communication system, MIMO wireless communication apparatuses, and wireless communication method

A wireless communication device and wireless communication system technology, applied in the field of MIMO wireless communication systems, can solve the problems of inseparable signal separation, incompleteness, carrier frequency or transmission timing error, etc., and achieve the effect of preventing communication failure or communication deterioration

Inactive Publication Date: 2008-10-29
HITACHI LTD
View PDF1 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to errors in the carrier frequency or transmission timing of multiple STAs, there is a problem that the signals processed by the MIMO of the AP cannot be separated or the separation is not complete and only very poor signals can be separated.

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
  • MIMO wireless communication system, MIMO wireless communication apparatuses, and wireless communication method
  • MIMO wireless communication system, MIMO wireless communication apparatuses, and wireless communication method
  • MIMO wireless communication system, MIMO wireless communication apparatuses, and wireless communication method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

Embodiment 2

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

When a plurality of user stations (STAs) simultaneously communicate with an access point (AP) through an SDMA (Space Division Multiple Access) channel in a MIMO wireless communication system, these STAs control their respective transmission signals such that each signal is received by only a different one of the plurality of antennas at the AP. (It should be noted that the number of these STAs is equal to or smaller than the number of antennas at the AP.) This eliminates the need for the AP to perform MIMO processing, thereby allowing the AP to properly receive and demodulate the signals even if they differ in carrier frequency and transmission timing, which would otherwise result in communication degradation or failure.

Description

technical field The present invention relates to a MIMO wireless communication system, in particular to a MIMO wireless communication system suitable for preventing communication failure or communication deterioration caused by MIMO processing on the AP side when an access node is connected to a user terminal through space division multiple access. Background technique In T. Ohgane, "A Study on channel allocation scheme with anadaptive array in SDMA" IEEE 47th VTC, Vol.2, 1997, p.725-729, discloses the relevant space division multiple access (SDMA: Spatial Division Multiple Access )Technology. In G.J.Foschini, "Layered space-time architecture for wirelesscommunication in a fading environment when using multi-elementantennas", Bell Labs Tech.J.Autumn 1996, p.41-59, discloses about space division multiplexing (SDM: Spatial Division Multiplexing) technology. In Andre Bourdoux, Nadia Khaled, "Joint Tx-Rx Optimization for MIMO-SDMA Based on a Null-space Constraint", IEEE2002....

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 Applications(China)
IPC IPC(8): H04B7/06H04B7/26H04L1/06H04J99/00
CPCH04B7/0626H04L1/0003H04L1/0009H04B7/0874H04L1/0071H04L1/0068H04B7/0643H04L1/0057H04L1/06H04L1/0026
Inventor 志田雅昭矢野隆早濑茂规山本敬亮
Owner HITACHI 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