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Periodic channel state information feedback method and system

A channel state information and periodic technology, applied in the direction of transmission system, digital transmission system, characterized by signaling, etc., can solve the problems of limited application range, large coding gain, and inability to obtain, and achieve wide application range and large coding Gain, performance optimal effect

Active Publication Date: 2014-07-02
福建省永阳国有资本投资集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • Periodic channel state information feedback method and system

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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 2 1 0 0 1 0 0 1 0 1 1 1 3 1 0 1 1 0 0 0 0 1 0 1 4 1 1 1 1 0 0 0 1 0 0 1 5 1 1 0 0 1 0 1 1 1 0 1 6 1 0 1 0 1 0 1 0 1 1 1 ...

Embodiment 2

[0086] 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

[0088] 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:

[0089] 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 0 0 0 1 0 1 1 1 4 1 1 1 1 0 0 0 1 0 0 1 1 1 5 1 1 0 0 1 0 ...

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Abstract

The present invention discloses a channel state information feedback method, comprising: a terminal determines the number of bits of periodic channel state information to be fed back and the target length after encoding; judging that the number of bits of periodic channel state information to be fed back is not greater than the preset The predetermined threshold is encoded by linear block code, and the encoded information is intercepted according to the determined target length after encoding; Intercepting the encoded information; the terminal modulates the intercepted encoded information and transmits it on the antenna port. The invention also correspondingly discloses a channel state information feedback system. The present invention has no limitation on the load of the channel state information, so the application range is wide; the linear block code adopted in the present invention can obtain the maximum coding gain, so that the performance is optimal.

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 sh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/26
CPCH04L1/0026H04L1/003H04L1/001
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
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