Spectrum　sensing　is　the　key　step　of　cognitive　radio.　Cyclostationarity,　which　mostly　comes　from　carrier　frequency,　modulation,　symbol　or　chip　rate　and　channel　coding,　is　often　considered　as　a　feature　to　extract　man-made　signal　from　the　natural　noise　in　spectrum　sensing.　This　paper　proposes　a　novel　cyclostationarity-based　combination　scheme　named　near-optimum　nonparametric　combination　scheme　(NONCS).　NONCS　is　nonparametric　so　that　it　has　nothing　to　do　with　noise　power,　channel　gain　and　data　distribution.　NONCS　is　almost　based　on　the　extremum　seeking　theory　so　that　it　is　near　optimum.　Simulation　experiments　are　provided　to　show　the　validity　and　the　superiority　of　the　proposed　NONCS　method.　©　2016,　Springer　Science+Business　Media　New　York.