Variable observation window length blind equalization detector for underwater acoustic communication

Bidirectional equalization for underwater acoustic communication.

The bidirectional decision feedback equalizer (BiDFE) that combines the outputs of a conventional decision feedback equalizer (DFE) and backward DFE can improve the performance of the conventional DFE by up to 1-2 dB based on simulations. In this letter, the BiDFE concept is extended to multichannel time reversal communications involving a DFE as a post-processor. Experimental data collected in...

Recursive Least Squares Fractionally-spaced Blind Equalization Algorithm for Underwater Acoustic Communication ⋆

Constant Modulus Algorithm (CMA), Fractionally-spaced Equalizer (FSE) and Recursive Least Squares (RLS)-CMA are investigated, and a low computational complexity RLS-CMA based on FSE with the simplified cost function of CMA (LRLS-FSE-SCMA) was proposed in this paper. To overcome the instability of RLS-CMA, the cost function of CMA is simplified to meet second norm form and an improved RLS-CMA (R...

Adaptive and efficient nonlinear channel equalization for underwater acoustic communication

We investigate underwater acoustic (UWA) channel equalization and introduce hierarchical and adaptive nonlinear channel equalization algorithms that are highly efficient and provide significantly improved bit error rate (BER) performance. Due to the high complexity of nonlinear equalizers and poor performance of linear ones, to equalize highly difficult underwater acoustic channels, we employ p...

Blind equalization for underwater communications

Underwater Acoustic Communication

Keywords: acousticc communicationss coherentt equalizationn channel estimationn multi-pathh diversity c o m biningg beamformingg multiuser detectionn underwater data networkss sparse equalizationn blind equalizationn multirate adaptive lteringg cyclostationary statistics .