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
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[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 ( b 0 ) = sign ( ( real ( r ) - imag ( r ) ) * ( ...
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