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Rapid encoding and decoding method for channel quality indication in LTE (Long Term Evolution) system

A technology of channel quality indication and encoding and decoding, which is applied in the field of LTE to achieve the effects of small calculation, fast encoding and decoding, and improved channel gain

Inactive Publication Date: 2011-06-22
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0002] In the system protocol of the LTE system, the channel quality indicator CQI (Channel Quality Indicator) adopts the Reed-Muller code Reed-Muller code (RM code) coding method , but no decoding method is given in the protocol
RM code is a kind of linear block code, and its optimal decoding algorithm is full search algorithm, but its calculation amount is relatively large

Method used

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  • Rapid encoding and decoding method for channel quality indication in LTE (Long Term Evolution) system
  • Rapid encoding and decoding method for channel quality indication in LTE (Long Term Evolution) system
  • Rapid encoding and decoding method for channel quality indication in LTE (Long Term Evolution) system

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Embodiment 1

[0031] If soft decision is adopted, the received codeword is directly b i Perform subsequent interleaving processing, and also perform interleaving processing on the mask sequence, the encoding matrix of the sending end M It is composed of a standard first-order RM code and a mask sequence after interleaving, and the received bipolar codeword at the receiving end b i Perform reverse interleaving processing, similarly, for the 6~10 rows of the coding matrix M 6 ~M 10 The five basic mask sequences (specified in the protocol) are also reversely interleaved to obtain the basic mask vector.

[0032] The interleaved codeword and the interleaved mask vector are respectively multiplied to eliminate the mask, and then the fast Hadamard transform FHT is performed separately, and the mask M 1 ~M 5 It is the Walsh code after interleaving, and their combination is exactly 32 row vectors of the 32-order Hadamard matrix; finally, compare and select to find the maximum correlation v...

Embodiment 2

[0041] In order to perform FHT, the length of the input sequence needs to be a power of 2, and the input of the (20,13) RM decoder is a bipolar sequence of length 20, so before performing interleaving, the length of the coded sequence is extended to 32, That is, add 12 0s to the high position of the sequence to complete the punctured data; then perform the same interleaving process as (32,11) RM decoding, and also perform interleaving processing on the mask sequence; the codeword after interleaving and the interleaving The mask vectors are multiplied to eliminate the mask, and then the FHT transformation is performed to eliminate the mask sequence to obtain the correlation matrix. Finally, the correlation matrix is ​​compared and selected to find the maximum correlation value, that is, to obtain the corresponding decoding information.

[0042] Specific steps are as follows:

[0043] Step1: After the decision (hard decision), the bipolar codeword or soft bit information need...

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Abstract

The invention relates to a rapid encoding and decoding method for channel quality indication in an LTE (Long Term Evolution) system. In the LTE system, Reed-Muller like codes are adopted CQI (Continuous Quality Improvement). An encoding matrix comprises classic first-order Reed-Muler codes and a mask sequence. The invention proposes a rapid decoding method according to the characteristics of the encoding matrix. The method can be used for decoding hard bit information and soft bit information. Shown by a great amount of simulation data, a full search algorithm can achieve an optimal theoretic performance when the method is used in hard bit decoding in a Gaussian channel environment. In soft bit decoding, the performance can be improved by 2.1 dB compared with the full search algorithm. By adopting rapid Hadamard transform in the invention, the arithmetic speed of the method is greatly improved and is approximately 4 times of the full search algorithm.

Description

Technical field: [0001] The present invention relates to LTE technology, in particular to coding and decoding technology in LTE (Long Term Evolution) long-term evolution system. Background technique: [0002] In the LTE system, the channel quality indicator CQI (Channel Quality Indicator) in the system protocol adopts the Reed-Muller code Reed-Muller code (RM code) coding method, but the decoding method is not given in the protocol. RM code is a kind of linear block code, and its optimal decoding algorithm is full search algorithm, but its calculation amount is relatively large. Therefore, this paper proposes a fast decoding method. [0003] In the LTE physical layer protocol, CQI uses two types of Reed-Muller code encoding methods, one is (32, 11) encoding, such as figure 1 As shown, the other is (20, 13) encoding, such as figure 2 shown. Among them, the CQI adopts (32, 11) encoding on the Physical Uplink Shared Channel (PUSCH), and adopts (20, 13) encoding on the P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H03M13/27
Inventor 陈发堂何坚龙李小文王丹王华华刘宇
Owner CHONGQING UNIV OF POSTS & TELECOMM
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