Mapper based on bit weaving code modulation system and mapping process thereof
A coding modulation and bit interleaving technology, applied in the improvement of signal mapper and its mapping method, combined with iterative demodulation/decoding system data transmission field, can solve the problem of low spectrum utilization rate and system bit error rate BER performance deterioration and other issues to achieve the effect of improving spectral efficiency and bit error rate performance
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[0038] Reference image 3 The BICM system used in the present invention is mainly composed of an encoder, a bit interleaver, a mapper, a demapper, a de-bit interleaver, and a decoder. The demapper and the decoder form a joint iteration. The mapper By adopting the improved mapper of the present invention, the group of the mapper adopts a structure based on approximate Gaussian distribution, and the group adopts a structure based on the minimum Hamming distance mapping rule. The structure based on the approximate Gaussian distribution between groups is that one constellation point corresponds to multiple information symbols at a position close to the origin of the constellation diagram, and one constellation point corresponds to one information symbol at a position far from the origin of the constellation diagram. The structure in the group based on the smallest Hamming distance is to set different information symbols corresponding to the same constellation point according to the ru...
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