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Iterative Frequency-Domain Equalization for General QAM Constellations with Reduced Envelope Fluctuations through Magnitude Modulation Techniques

Gomes, M. ; Dinis, R. ; Silva, V. ; Cercas, F. ; Oliveira, L. A. C.

Iterative Frequency-Domain Equalization for General QAM Constellations with Reduced Envelope Fluctuations through Magnitude Modulation Techniques, Proc IEEE Vehicular Technology Conf. - VTC-Spring, Glasgow, United Kingdom, Vol. -, pp. - - -, May, 2015.

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Abstract
The development of new mobile communications systems faces several important challenges, namely demanding for high bit rates, high spectral efficiency, low energy con- sumption and the usage of hostile channels. In order to fulfill these requirements for block-based single carrier transmissions, we propose to use high order QAM constellations combined with envelope control Magnitude Modulation (MM) techniques and bit-interleaved coded modulation with LDPC codes. Also, the receiver uses powerful MM specialized IB-DFE solutions to combat the channel distortion and noise. The obtained results have shown significant improvements in terms of energy efficiency and bit error rate (BER).