Patent ID: 8270531
Filing Date: 2012-09-18
Classification: H04L

Abstract:
1. A method for transmitting a data bit stream using a first 16-QAM constellation and a second 16-QAM constellation, the method comprising the steps of: forming a sequence of data words from the bit stream, each data word comprising four bits, mapping each data word to a modulation symbol using the first 16-QAM constellation to generate a first arrangement pattern of modulation symbols, mapping each data word to a modulation symbol using the second 16-QAM constellation to generate a second arrangement pattern of modulation symbols, and transmitting the first arrangement pattern of modulation symbols and the second arrangement pattern of modulation symbols according to a transmit diversity scheme, wherein the second arrangement pattern of modulation symbols is obtained by rearranging the first arrangement pattern of modulation symbols according to the rearrangement rules of wherein the differently dashed arrows indicate the rearrangement of a data word corresponding to a modulation symbol in the first 16-QAM constellation and the same data word corresponding to a modulation symbol in the second, rearranged 16-QAM constellation, wherein the modulation symbol in the first 16-QAM constellation is indicated by the start of an arrow line and the modulation symbol in the second, rearranged 16-QAM constellation is indicated by the end of the arrowhead of the same arrow, and wherein each of the first 16-QAM constellation and the second 16-QAM constellation has 16 modulation symbols representable in four rows and four columns in a complex coordinate plane, and each modulation symbol of the first and second 16-QAM constellations represents a combination of four bits, wherein each of the first 16-QAM constellation and the second 16-QAM constellation obeys the following mapping rules: