_0-norm based adaptive equalization with PMSER criterion for underwater acoustic communications

摘要

Underwater acoustic channels (UWA) are usually sparse,which can be exploited for adaptive equalization to improve the systemperformance. For the shallow UWA channels, based on the proportionalminimum symbol error rate (PMSER) criterion, the adaptive equalizationframework requires the sparsity selection. Since the sparsity of the _0 normis stronger than that of the _1, we choose it to achieve better convergence.However, because the _0 norm leads to NP-hard problems, it is difficultto find an efficient solution. In order to solve this problem, we choose theGaussian function to approximate the _0 norm. Simulation results showthat the proposed scheme obtains better performance than the _1 basedcounterpart.