Velocity matching method for limited longness circulation caching of Turbo code

A circular buffering and rate matching technology, applied in the field of communication, can solve problems such as multiple overlaps, degraded retransmission performance, uneven distribution of HARQ starting points, etc., and achieve the effect of improving retransmission performance and reducing size

Active Publication Date: 2008-05-21
ZTE CORP
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Problems solved by technology

[0009] In the existing rate matching method of finite-length circular buffer, the HARQ starting points corresponding to each redundant version are unevenly distributed in the circular buffer, which may cause some codewords to overlap multiple times during the HARQ packet retransmission process. The other part of the codewords does not overlap, which will lead to a decrease in retransmission performance

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  • Velocity matching method for limited longness circulation caching of Turbo code
  • Velocity matching method for limited longness circulation caching of Turbo code
  • Velocity matching method for limited longness circulation caching of Turbo code

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Embodiment Construction

[0031] The rate matching method (for one-dimensional limited-length circular buffer) of the limited-length circular buffer of Turbo code according to an embodiment of the present invention, comprises the following steps:

[0032] Step A1, performing Turbo encoding on the bit data of the input information block;

[0033] Step A2, determining the size of the limited-length circular cache;

[0034] Step A3: The starting position k of the HARQ data packet specified by each redundancy version value 0 Uniformly or approximately uniformly distributed over length N cb In the finite-length circular buffer of ;

[0035] Step A4, according to the number of HARQ retransmissions, select the value of the redundant version, start from the starting position corresponding to the value of the redundant version, read the bit data of length L sequentially from left to right, and form the current HARQ data packet;

[0036] Step A5, sending the current HARQ data packet to the subsequent processi...

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Abstract

The invention discloses a rate matching method for finite length loop buffer of a turbo code, comprising the steps: turbo coding is carried out to data bits of an input data block, upon which the size of a one-dimensional finite length loop buffer is decided; the initial positions of hybrid automatic repeat request data packets appointed by a plurality of predefined redundancy version values are evenly or approximately distributed in the one-dimensional finite length loop buffer; a redundancy version value is selected from the predefined redundancy version values in line with times of the hybrid automatic repeat requests; then data bits with specific length are read in turn from the initial position of hybrid automatic repeat request data packets appointed by the selected redundancy version values, thus a hybrid automatic repeat request data packet is formed and then sent out. The invention has the advantages of reduced size of circular buffer and improved repeat performance of hybrid automatic repeat request data packet.

Description

technical field [0001] The present invention relates to the communication field, and more specifically relates to a rate matching method of a limited-length circular buffer of a Turbo code. Background technique [0002] In a wireless communication system, the channel coding link is the underlying technology of the physical layer, which determines the underlying transmission performance and transmission reliability of the wireless communication system. In the latest 3GPP LTE standard research, the channel coding link adopts a series of latest technologies, which improves the transmission performance of the physical layer while simplifying the implementation complexity. Among them, in the latest 3GPP standard protocol, ① Turbo code based on Quadratic Polynomial Permutation (QPP) interleaver is adopted as the channel coding scheme for data services; ② rate matching based on Circular Buffer is adopted The method is used to realize the matching between the length of the transmit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/29
Inventor 许进袁志锋李松徐俊胡留军
Owner ZTE CORP
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