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Dynamic allocation method for decoding iteration of transmission block of topological code of long term evolution (LTE) system

A long-term evolution system and dynamic allocation technology, applied in transmission systems, digital transmission systems, electrical components, etc., can solve the problem of uncorrected bit errors, and achieve the effect of improving decoding performance

Active Publication Date: 2011-07-20
SOUTHEAST UNIV
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Problems solved by technology

The main function of CRC is to detect whether there is a bit error in the transmission data block, but it has no ability to correct the bit error itself.

Method used

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  • Dynamic allocation method for decoding iteration of transmission block of topological code of long term evolution (LTE) system
  • Dynamic allocation method for decoding iteration of transmission block of topological code of long term evolution (LTE) system
  • Dynamic allocation method for decoding iteration of transmission block of topological code of long term evolution (LTE) system

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Embodiment Construction

[0040] For the decoder resources allocated to the topology coded transport block TB by the LTE system, the present invention proposes a dynamic allocation method for the decoding iteration of the transport block. The invention redistributes the decoder resources saved in the encoding blocks successfully decoded in advance within the maximum number of iterations to other encoding blocks, thereby improving the decoding performance of the entire transmission block TB. as attached Figure 5 As shown, the specific steps are as follows:

[0041] Step 1: Traversing the N topology coded blocks CB contained in the transport block TB for the first time 1 , CB 2 ,...,CB N ,in A is the number of bits contained in the transmission block, which is decoded by an iterative decoding algorithm based on the maximum a posteriori probability, and CRC check is performed at the same time, and the number of iterations W that can be allocated is accumulated. The maximum number of iterations for ...

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Abstract

The invention provides a dynamic allocation method for decoding iteration of a transmission block of a topological code of a third generation partnership project (3GPP) long term evolution (LTE) system. According to the method, within the maximum processing time delay of the transmission block, the remained iterative decoding time delay of encoding blocks which are decoded successfully in advanceis re-allocated to the encoding blocks which cannot be successfully decoded temporarily by effectively utilizing decoder hardware resources and the processing time delay allocated to the current transmission block, so that the decoding performance of the whole transmission block is improved. The method mainly comprises the following steps of: limiting the processing time delay of the transmissionblock by setting the maximum iterations of each encoding block, wherein the each encoding block of the transmission block in the LTE adopts an iterative decoding algorithm based on maximum posterior probability; firstly, carrying out iterative decoding on the encoding blocks sequentially, carrying out cyclic redundancy check simultaneously, and counting the iterations for dynamic allocation according to a check result; and when decoding of all of the encoding blocks is finished, averagely allocating the counted iterations to the encoding blocks which are not decoded successfully, and continuing carrying out the iterative decoding on the encoding blocks according to the iterations obtained by allocation.

Description

technical field [0001] The invention provides a method for dynamically allocating decoding iterations of topology code transmission blocks in a long-term evolution system, and belongs to the technical field of digital communication data link layers in communication and information systems. Background technique [0002] 1. The physical layer transmission block of the LTE (3GPP Long Term Evolution, long-term evolution) system [0003] The data service in LTE (3GPP Long Term Evolution, long-term evolution) uses a topological coding scheme, and the data arrives at the coding unit in the form of a transmission block, and a transmission block is obtained in each transmission time interval (TTI) (except in the space division multiplexing mode) ). The longer the code length of the topological code, the closer the code word is to the random code, the better the performance, but the higher the complexity of the codec implementation, the less suitable for practical applications. There...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
Inventor 姜明赵春明赵欢张华黄鹤
Owner SOUTHEAST UNIV
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