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Soft demodulation method for 8PSK Gray mapping

A technology of Gray mapping and soft demodulation, which is applied in digital transmission systems, electrical components, DC level restoration devices/bias distortion correction, etc., to achieve the effect of simple calculation and elimination of multiplication operations

Inactive Publication Date: 2009-04-08
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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Problems solved by technology

[0012] Although the approximation method omits the exponent operation, it still needs to calculate the Euclidean distance to all constellation points and take the minimum value

Method used

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  • Soft demodulation method for 8PSK Gray mapping
  • Soft demodulation method for 8PSK Gray mapping
  • Soft demodulation method for 8PSK Gray mapping

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Embodiment Construction

[0025] The implementation method of this patent is illustrated below by specific examples.

[0026] The sender divides the bits to be sent into groups of 3, and set these 3 bits as b 0 , b 1 , b 2 , align them according to figure 1 The manner shown is mapped to the corresponding constellation and sent out. Assume that the signal received by the receiver is r (r is a complex number). then b 0 , b 1 , b 2 The corresponding soft information can be extracted according to the following rules.

[0027] b 0 Extraction of soft information:

[0028] llr(b0)=sign((real(r)-imag(r))*(real(r)+imag(r)))

[0029] * min ( abs ( real ( r ) - imag ( r ) ) , abs ( ...

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Abstract

The invention provides a soft demodulation method of 8PSK Gray mapping. The realization method is as follows: a hard decision line corresponding to each bit is found in a 2D coordinate plane, the minimum distance from a receiving signal to the hard decision line is taken as the size of the bit soft information, and a symbol of the soft information is determined by the position of the receiving signal in relation to the hard decision line.

Description

technical field [0001] The invention relates to the field of computer and communication, in particular to a soft demodulation method of Gray mapping 8PSK modulation. Background technique [0002] Gray mapping 8PSK (octal phase shift keying) is widely used in various wireless digital communication systems due to its high frequency utilization and better performance. The Gray mapped constellation indicates that the mapped constellation is coded according to the Gray code, which ensures that the mapped constellation is symmetrical, and only one code element is different between adjacent constellation points. Compared with other constellations, the gray map constellation has a lower bit error rate for the same symbol error rate. [0003] In order to make full use of the information of the received signal for error correction decoding, the demodulator should provide the decoder with soft decision information that can reflect the probability of the received bit. Generally, the lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L25/06
Inventor 王磊徐大专
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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