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

Periodic channel state information feedback method and system

A channel state information and feedback system technology, applied in the field of periodic channel state information feedback methods and systems, can solve the problems of limited application range, large coding gain, inability to obtain, etc., and achieves wide application range, large coding gain, and the highest performance. excellent effect

Active Publication Date: 2010-05-05
福建省永阳国有资本投资集团有限公司
View PDF4 Cites 25 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many ways of transmit diversity, among which Space Orthogonal-Resource Transmit Diversity (SORTD) has the best performance. This way is to use different orthogonal resources to transmit the same control signaling on different antennas, so that Diversity gain is obtained, but this method is only suitable for the case where the load of channel state information is less than 11 bits. According to the previous description, the LTE-A system that introduces multiple new technologies periodically feeds back the load of channel state information in some modes. will be greater than 11 bits, so the application range of the SORTD method is limited; moreover, since the coding method used in this method is Reed-Muller (20, A), the maximum coding gain cannot be obtained

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
  • Periodic channel state information feedback method and system
  • Periodic channel state information feedback method and system
  • Periodic channel state information feedback method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] In this embodiment, the preset threshold α=11, the linear block code adopts Reed-Muller encoding, and the corresponding basic sequence is shown in Table 3, which is a basic sequence of (32,11), and other forms of basic sequences are not excluded , such as the form after row permutation using the basic sequence shown in Table 3, the tail-biting convolutional code adopts the following image 3 shown in the encoder,

[0079]

i

M i，0

M i，1

M i，2

M i，3

M i，4

M i，5

M i，6

M i，7

M i，8

M i，9

M i，10

0

1

1

0

0

0

0

0

0

0

0

1

1

1

1

1

0

0

0

0

0

0

1

1

[0080]

i

M i，0

M i，1

M i，2

M i，3

M i，4

M i，5

M i，6

M i，7

M i，8

M i，9

M i，10

2

1

0

0

1

0

0...

Embodiment 2

[0088] In this embodiment, the preset threshold α=11, the linear block code adopts Reed-Muller encoding, and the corresponding basic sequence is also shown in Table 3, and the tail-biting convolutional code adopts image 3 As shown in the encoder, it is assumed that the UE needs to feed back channel state information [O 0 CSI , O 1 CSI ,...O 11 CSI ], then M=12 bits, assuming that the number of antenna ports of the UE is N=2, the PUCCH format 2 / 2a / 2b is used to send [O 0 CSI , O 1 CSI ,...O 11 CSI ], then the number of symbols carried by PUCCH 2 / 2a / 2b is R=10, and QPSK modulation is used, so Q m =2, then the number of encoded information is N*R*Q m =40, because M>α, so use image 3 The tail-biting convolutional code shown intercepts the encoded information with a length of 40 [b 0 , b 1 ,...b 39 ], perform QPSK modulation, and the modulated symbol is [b 0 sym , b 1 sym ,...b 19 sym ], using a CG-CAZAC sequence with a cyclic shift of CS1 to transmit on tran...

Embodiment 3

[0090] In this embodiment, the preset threshold α=13, the linear block code adopts Reed-Muller encoding, and the corresponding basic sequence is also shown in Table 4, which is a basic sequence of (32,13), and other forms of basic sequences are not excluded. Sequence, such as the form after row permutation using the basic sequence shown in Table 4, the tail-biting convolutional code adopts the following image 3 Encoders shown:

[0091]

i

M i，0

M i，1

M i，2

M i，3

M i，4

M i，5

M i，6

M i，7

M i，8

M i，9

M i，10

M i，11

M i，12

0

1

1

0

0

0

0

0

0

0

0

1

1

0

1

1

1

1

0

0

0

0

0

0

1

1

1

0

2

1

0

0

1

0

0

1

0

1

1

1

1

1

3

1

0

1

1

0

...

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 periodic channel state information feedback method comprising the following steps: determining the bit number of the periodic channel state information needing to be fed back as well as the coded target length by a terminal; judging that the bit number of the periodic channel state information needing to be fed back is not more than the preset threshold value, then coding by adopting the mode of linear block code and intercepting the coded information according to the determined coded target length, or coding by adopting the mode of tail biting convolutional code, and intercepting the coded information according to the determined coded target length; and modulating the intercepted coded information by the terminal and transmitting on an antenna port. The invention correspondingly discloses a channel state information feedback system. The invention has no limitation to the load of the channel state information, thus the application range is wider. The linear block code adopted by the invention can obtain maximum coding gain, thus optimizing the performances.

Description

technical field [0001] The invention relates to the field of digital communication, in particular to a periodic channel state information feedback method and system. Background technique [0002] In the Long Term Evolution (LTE), the information (Channel State Information, CSI) reflecting the downlink physical channel state has three forms: channel quality indication (Channels quality indication, CQI), precoding matrix indication (Pre-coding Matrix Indicator, PMI), Rank Indicator (Rank Indicator, RI). [0003] Different CQIs are reflected by different modulation and coding rates. There are 16 cases in total, which can be represented by 4 bits of information. The relationship between the CQI index and the modulation and coding method (MCS) is shown in Table 1: [0004] [0005] Table 1 [0006] PMI means that only in the transmission mode of closed-loop spatial multiplexing, the terminal (User Equipment, UE) tells the base station (eNode B, eNB) what precoding matrix sho...

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): H04B7/26
CPCH04L1/003H04L1/001H04L1/0026
Inventor 杨维维梁春丽徐俊夏树强
Owner 福建省永阳国有资本投资集团有限公司
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