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

Three-dimensional beam forming space division multi-access adaptive transmission method adopting statistic channel state information

A channel state information, adaptive transmission technology, applied in transmission systems, space transmit diversity, radio transmission systems, etc., can solve problems such as unrealistic, channel information uplink capacity burden, channel estimation error, etc.

Active Publication Date: 2015-01-28
SOUTHEAST UNIV
View PDF5 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the inevitable feedback delay in the transmission of feedback information, and the channel estimation may have errors, it is often unrealistic to assume that the ideal channel information is known at the sending end, especially when the number of users and the number of transmitting antennas are large and the channel When the state changes rapidly
In addition, for FDD systems, the feedback of channel information causes a great burden on the uplink capacity, and this problem becomes more serious in broadband (such as OFDM) systems and systems with high mobility

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
  • Three-dimensional beam forming space division multi-access adaptive transmission method adopting statistic channel state information
  • Three-dimensional beam forming space division multi-access adaptive transmission method adopting statistic channel state information
  • Three-dimensional beam forming space division multi-access adaptive transmission method adopting statistic channel state information

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0054] Below embodiment is made further description The specific implementation mode of the present invention is as follows:

[0055] 1) If it is a TDD system, skip to step 2); if it is an FDD system, skip to step 4).

[0056] 2) The base station uses the result of uplink channel estimation and channel reciprocity to obtain the downlink channel matrix H of user i i , using the formulas [3] and [4] to calculate the vertical transmission correlation matrix R of user i respectively V,i and horizontally send the correlation matrix R H,i .

[0057] 3) Use the formula [5] and [6] to calculate Λ V,i and Λ H,i , respectively find out the main mode of user i in the vertical direction and the main mode in the horizontal direction with and the corresponding index l i and j i , go to step 6).

[0058] 4) User i uses the result of its channel estimation to calculate its vertical transmission correlation matrix R according to the formulas [3] and [4] V,i and horizontally send th...

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 three-dimensional beam forming space division multi-access adaptive transmission method adopting statistic channel state information. The method aims at increasing the spectrum use rate of a communication system and improving the power efficiency of the communication system. The method specifically includes the steps that for an FDD system, each user calculates statistic channel state information of the user according to a channel estimated result, the statistic channel state information refers to a main perpendicular mode, a main horizontal mode and corresponding indexes and is fed back to a base station; for a TDD system, the base station uses an uplink channel estimated result for calculating downlink statistic channel state information of the users; the base station selects two groups of service users according to the acquired statistic channel state information and conducts pre-code transmission on the two groups of users in two time slots. According to the three-dimensional beam forming space division multi-access adaptive transmission method adopting the statistic channel state information, system robustness is effectively improved and the high average mutual information quantity can be acquired with low calculation complexity.

Description

technical field [0001] The invention relates to a multi-user downlink transmission system for transmitting high-speed data by using a uniform planar antenna array, in particular to an adaptive transmission method for a multi-user downlink transmission system using statistical channel state information. Background technique [0002] In recent years, research on information theory has shown that multi-antenna technology can significantly improve the transmission rate of wireless communication systems. At present, the research on the point-to-point single-user system has basically reached a conclusion, while the research on the capacity and optimal transmission scheme of the multi-user system has attracted extensive attention of international scholars. The multi-user multi-antenna system can obtain good performance and large capacity because of its diversity gain, multiplexing gain and multi-user diversity gain, and it will become one of the key technologies of the new generati...

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): H04B7/04
CPCH04B7/0452H04B7/0617H04B7/0626Y02D30/70
Inventor 李潇金石高西奇
Owner SOUTHEAST 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