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Obtaining method of optimal generation polynomial in type-II hybrid automatic repeat request (HARQ) system and repeat system adopting method

A technology for generating polynomials and acquisition methods, which is applied in the field of digital communication and can solve problems such as poor anti-interference ability

Inactive Publication Date: 2012-09-19
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problem of poor anti-interference ability of the existing existing HARQ retransmission system, the present invention proposes an optimal generator polynomial acquisition method in the Type-II HARQ retransmission system In the Type-II HARQ retransmission system Method for obtaining optimal generator polynomial and retransmission system using the method

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  • Obtaining method of optimal generation polynomial in type-II hybrid automatic repeat request (HARQ) system and repeat system adopting method
  • Obtaining method of optimal generation polynomial in type-II hybrid automatic repeat request (HARQ) system and repeat system adopting method
  • Obtaining method of optimal generation polynomial in type-II hybrid automatic repeat request (HARQ) system and repeat system adopting method

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specific Embodiment approach 1

[0017] Specific implementation mode 1. Combination figure 1 This embodiment is specifically described. The method for obtaining the optimal generator polynomial in the Type-II HARQ retransmission system described in this embodiment is:

[0018] Step 1. The sending end receives the information source, and the information source encoder at the sending end encodes the information source to obtain the information sequence u(D);

[0019] Step 2. The channel encoder at the sending end combines the information sequence u(D) with the convolutional code G of the channel encoder i (D) Perform convolution to obtain the codebook set c i (D),

[0020] Step 3: Calculate the codebook set c one by one i For the code weight of each codeword in (D), take the minimum code weight in the codebook set, and according to the convolutional code G corresponding to the minimum code weight i (D) the free distance of the generating polynomial;

[0021] Step 4: Take the convolutional code G i (D) One...

specific Embodiment approach 2

[0024] Embodiment 2. The difference between this embodiment and the method for obtaining the optimal generator polynomial in the Type-II HARQ retransmission system described in Embodiment 1 is that the channel encoder at the sending end in step 2 converts the information sequence u( D) Convolutional code G with channel encoder i (D) The specific steps for convolution are:

[0025] The maximum length of the information sequence u(D) is l max , the polynomial generated by the convolutional code (n, k, m) of the channel encoder has a total of 2 n(m+1) If the first bit of the sequence is specified as 1, then the sequence is from [1 0 ... 0] to [1 1 ... 1], a total of 2 lmax-1 , for each channel encoder structure composed of generator polynomials, the 2 lmax-1 Different information sequences u(D) are sequentially input into the channel encoder to obtain 2 lmax-1 output sequences, that is, the codebook set c i (D).

specific Embodiment approach 3

[0026] Embodiment 3. The difference between this embodiment and the method for obtaining the optimal generator polynomial in the Type-II HARQ retransmission system described in Embodiment 2 is that the generator polynomial G obtained in step 4 is judged one by one in step 5. i The specific steps of whether it is a non-vicious convolutional code are: judge the generator polynomial G i Whether the non-zero sequence code in the state diagram of the state diagram has a loop in the diagram, and the coded output is all zero, if yes, the corresponding convolutional code is a vicious convolutional code, if not, the corresponding convolutional code is Non-vicious convolutional codes.

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Abstract

The invention provides an obtaining method of an optimal generation polynomial in a type-II hybrid automatic repeat request (HARQ) system and a repeat system adopting the method, relates to the obtaining method of the optimal generation polynomial in the type-II HARQ system and the repeat system adopting the method, and aims at solving the problem of poor anti-jamming capability of the existing HARQ system. Code words received by the receiving end of the repeat system have the maximum free distance under the given encoder restraining length, the free distance is used as the basis for measuring the intensity of the codebook anti-jamming capability when the Viterbi decoding is used, and the convolutional code error correction capability is determined by the greatest minimum free distance when the Viterbi decoding is adopted by the receiving end; and in the type-II HARQ system, the repeat in each time can be merged into the code words with the new code rate with the original code wards, and the effect equivalent to the once-step emission of the code words with the new code rate at the emitting end is realized. The method and the system provided by the invention are applicable to the technical field of error control.

Description

technical field [0001] The present invention relates to the field of digital communication. Background technique [0002] With the vigorous development of wireless communication, people are no longer satisfied with simple voice calls through handheld terminals, but hope that the system can provide more colorful multimedia services, such as broadband games, Internet TV, telemedicine, video conferencing, etc. These multimedia services also put forward higher requirements on Quality of Service (QoS). However, in the process of channel transmission, the information is inevitably affected by the channel (wired or wireless) to cause errors, which reduces the quality of service. Therefore, how to reduce the error probability and improve QoS has always been a concern of people. [0003] Error control technology provides a basic solution to this problem. At present, in digital communication systems, there are roughly the following types of error control methods using error-correct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/18
Inventor 于启月杨堃孟维晓于洪涛陈雷
Owner HARBIN INST OF TECH
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