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Encoder of parallel-convolution LDPC code based on precoding and its fast encoding method
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An LDPC code and precoding technology, applied in the field of communication, can solve problems such as high complexity and long coding delay
Inactive Publication Date: 2006-05-24
LISHUI BOYUAN TECH CO LTD
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[0009] The technical solution of the present invention is to provide an encoder based on pre-encoded parallel convolutional LDPC codes and its fast encoding method to solve the problems of high complexity and large encoding time delay of the above-mentioned encoding method
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Embodiment 1
[0063] refer to image 3 , the present embodiment is (756, 3, 6) encoder design and encoding process of parallel convolutional LDPC code, and optimizes the first check matrix H by designing the interleaver in a pseudo-random manner π .
[0065] The encoder includes an information grouping unit, an information precoding unit, a convolutional encoding unit and an information recombination unit. The composition and functions of each unit are as follows:
[0066] (1) Information grouping unit, used to realize information flow serial-to-parallel conversion, that is, to convert an information flow into M=3 parallel sub-information flows, each sub-information flow length L=126, and all 3 sub-information flows obtained are respectively sent into The corresponding memory is used to perform the precoding operation of the information precoding unit.
[0067] (2) Information precoding unit, used to realize the first parity check mat...
Embodiment 2
[0093] refer to Figure 5 , the present embodiment is (3060,3,6) encoder design and encoding process of parallel convolutional LDPC code, and optimizes the first parity check matrix H by randomly designing an interleaver π .
[0095] The encoder includes an information grouping unit, an information precoding unit, a convolutional encoding unit and an information recombination unit. The composition and functions of each unit are as follows:
[0096] (1) The information grouping unit transforms one information stream into M=3 parallel sub-information streams, and the length of each sub-information stream is L=510.
[0097] (2) Information precoding unit, including memory, interleaver and modulo 2 adder, wherein the number of memory is equal to the number of parallel sub-information flow, namely equal to 3, each memory corresponds to 3 random interleavers, modulo 2 addition The number of devices is equal to 3. The first in...
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Abstract
Through designing encoder for paralleled convolution codes (LDPC), the method carries out encoding, and obtains check matrix H for LDPC code. The encoding procedure is as following: grouped information sequence is stored in memory; through different random interleaving units, the interleaved information sequence is sent to corresponding modulus 2 and processing unit to carry out precoding; then check bit obtained from the precoding is sent to different convolutional coders of recursion to carry out convolutional coding; finally, recombination of check bit outputted from convolutional coders and information bit in memory creates LDPC code words with code rate Rú¢M / (M+N), code length as (M+N)L. Under condition of ensuring performance, the method realizes encoding in high speed. Features are: lower memory space needed, and flexible design and application.
Description
technical field [0001] The invention belongs to the communication field and relates to coding technology, in particular to a fast coding method based on precoded parallel convolution low-density check code LDPC, which is suitable for efficient coding of fast data transmission. Background technique [0002] In modern digital communication systems, in order to ensure that various data can be transmitted reliably and effectively, error correction coding technology is often used. In recent years, with the development of wireless digital communication and the emergence of various high-speed data services, it is more and more important to study and use error correction coding technology. [0003] Theoretical studies show that the performance of LDPC long codes exceeds Turbo codes and is close to the Shannon limit. It also has linear decoding complexity and is suitable for high-speed data transmission. American scientist Gallager invented the LDPC code in the early 1960s, but it w...
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