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Low-complexity receiver for wavelet-filtered M-ary modulations over flat-fading channels

As originally designed, the wavelet coding technique efficiently overcomes the fading effects, but limits the spectral efficiency of these systems to 1 bit/s/Hz. Furthermore, the coded symbols are modulated by unusual signal constellations that need to be designed by optimization methods. An alternative approach based on wavelet matrix to increases the communication system robustness to time-varying fading is proposed in another work by the same authors. This can be easily adapted to any wireless communication system maintaining its original spectral efficiency. However the derivation of receiving strategies is more critical under this novel wavelet-matrix based systems. This paper presents a receiving strategies which is show to be simple and effective, giving rise to outstanding performance gains over conventional amplitude/phase modulations with the same spectral efficiency.