Signal space diversity: a power- and bandwidth-efficient diversitytechnique for the Rayleigh fading channel
Boutros, J.; Viterbo, E.
Information Theory, IEEE Transactions on
Volume 44, Issue 4, Jul 1998 Page(s):1453 - 1467
Digital Object Identifier   10.1109/18.681321
Summary:The increasing need for high data-rate transmissions over time- or frequency-selective fading channels has drawn attention to modulation schemes with high spectral efficiency such as QAM. With the aim of increasing the “diversity order” of the signal set we consider multidimensional rotated QAM constellations. Very high diversity orders can be achieved and this results in an almost Gaussian performance over the fading channel, This multidimensional modulation scheme is essentially uncoded and enables one to trade diversity for system complexity, at no power or bandwidth expense

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