发明名称 |
BIT-OPERATED REARRANGEMENT DIVERSITY FOR AICO MAPPING |
摘要 |
<p>Transmit diversity system in which constellation rearrangement is used. Both diversity signals contain the same data and both are 16-QAM, but the location of the data bits within the constellation is different. This averages the effect of the different levels of reliability of the different constellation points. A method for modifying a quadruple of data bits in a data transmission system using Quadrature. Amplitude Modulation with 16 different modulation states, 16-QAM, using an Antipodal Inverted Constellation (AICO) mapping, swapping bits selecting contiguous symbol regions with bits selecting non-contiguous symbol regions. Depending on the particular pre-defined mapping and on the particular permutation of bits, inversion of selected bits may be performed in addition. The quadruples thus obtained are mapped to modulation symbols according to a pre-defined AICO mapping. In the corresponding method for receiving the symbols, likelihood values are swapped and modified in a way which is complementary to the permutation and inversion of bits, before they are combined with likelihood values from other symbols representing the same bits. Method ensures that there is a one to one correspondence between Hamming distance and Euclidian distance for the combined received data. In other words it ensures that, once combined, all 4 bit data words which differ by the same number of bits (Hamming distance) are the same distance apart in the constellation (Euclidian distance).</p> |
申请公布号 |
WO2007012339(A1) |
申请公布日期 |
2007.02.01 |
申请号 |
WO2005EP08111 |
申请日期 |
2005.07.26 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.;GOLITSCHEK EDLER VON ELBWART, ALEXANDER;WENGERTER, CHRISTIAN;YOSHII, ISAMU |
发明人 |
GOLITSCHEK EDLER VON ELBWART, ALEXANDER;WENGERTER, CHRISTIAN;YOSHII, ISAMU |
分类号 |
H04L27/34 |
主分类号 |
H04L27/34 |
代理机构 |
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