Encoding and decoding method for improving decoding efficiency by pilot frequency information and device thereof

A pilot information, coding and decoding technology, applied in the field of coding and decoding, can solve the problems of reducing coding efficiency, high decoding complexity, and many iterations, so as to simplify the decoding process, reduce the decoding delay, and improve the The effect of decoding performance

Inactive Publication Date: 2009-09-16
西安新邮通信设备有限公司
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Problems solved by technology

However, due to the high decoding complexity and the large number of iterations (LDPC codes generally range from 20 to 50 iterations), the resulting time delay is a major factor restricting its development.
[0003] In the decoding process of error-correcting codes, if there is known information, by changing the soft information value corresponding to the known information, the convergence of decoding can be effectively improved (it can effectively reduce the number of iterations in decoding) and the decoding If the performance of the code is simply added to the information before encoding, the efficiency of the encoding will be reduced

Method used

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  • Encoding and decoding method for improving decoding efficiency by pilot frequency information and device thereof
  • Encoding and decoding method for improving decoding efficiency by pilot frequency information and device thereof
  • Encoding and decoding method for improving decoding efficiency by pilot frequency information and device thereof

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] figure 1 It is a schematic diagram of the pilot insertion position for channel estimation in the WIMAX wireless access system, figure 2 It is a schematic diagram of realizing the encoding and modulation process in the standard, and the present invention is as follows image 3 As shown, the position of pilot insertion is changed to before the error correction coding.

[0021] Device example:

[0022] The present invention as Figure 4 As shown, it includes two parts: a code modulation unit and a demodulation and decoding unit.

[0023] The coded modulation unit first uses the pilot inserter 401 to insert the pilot sequence y into the information sequence x 1 , get the information sequence x 2 , and then the information sequence x 2 Encoded by the error correction encoder 402 to obtain the information sequence x 3 , and finally through the...

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Abstract

The invention discloses an encoding and decoding method for improving decoding efficiency by pilot frequency information and a device thereof. The method comprises the following steps that: pilot frequency sequences are evenly inserted into an information sequence before encoding, and the information sequence is subjected to error correction encoding by an error correcting code; the encoded information sequence is generated into an OFDMA symbol after IFFT conversion, and is transmitted to a receiving end; the receiving end carries out FFT conversion on the received information sequence to obtain soft information corresponding to the information sequence which is encoded by a transmitting end; the positions of the pilot frequency sequences inserted into the information sequence are set into corresponding soft information values according to values of the pilot frequency sequences; and the information is subjected to error correcting decoding to obtain transmitting information of the transmitting end. The method and the device can improve the velocity of convergence and decoding performance of an error correcting decoder, reduce the times of decoding iteration, reduce decoding time delay, and simplify the process of decoding.

Description

technical field [0001] The present invention relates to a coding method and a device thereof. Background technique [0002] In wireless communication systems, in order to improve the reliability of transmission and meet the needs of high-speed data services, error-correcting codes such as Turbo and LDPC codes that can obtain high coding gain through iterative decoding are usually selected. However, due to the high decoding complexity and the large number of iterations (LDPC codes generally have 20 to 50 iterations), the resulting time delay is a major factor restricting its development. [0003] In the decoding process of error-correcting codes, if there is known information, by changing the soft information value corresponding to the known information, the convergence of decoding can be effectively improved (it can effectively reduce the number of iterations in decoding) and the decoding If the performance of the code is simply added to the information before encoding, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/00H04W4/00
Inventor 郭旭东
Owner 西安新邮通信设备有限公司
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