This　paper　proposes　a　new　OFDM　symbol　duration　based　cyclostationary　spectrum　sensing　method.　The　method　first　estimates　the　cyclic　autocorrelation　function　from　every　received　OFDM　symbol　during　its　symbol　period,　then　constructs　the　test　statistic　and　the　threshold　by　using　multivariate　statistical　analysis,　and　finally　gets　the　decision　result　by　comparing　the　test　statistic　with　the　threshold.　The　method　is　nonparametric　so　that　it　is　immune　from　noise　uncertainty.　Simulation　results　show　that　the　method　can　significantly　reduce　the　complexity　at　the　cost　of　a　little　performance　loss,　compared　with　conventional　cyclostationary　spectrum　sensing　method.　Moreover,　this　paper　further　proposes　a　multiple　antenna　based　nonparametric　linear　weighted　combination　scheme.　Simulation　results　also　show　that　the　performance　of　the　proposed　combination　scheme　is　almost　the　same　as　that　of　conventional　cyclostationary　spectrum　sensing　method　while　the　proposed　combination　scheme　has　the　advantage　of　complexity　by　optimizing　the　nonparametric　weights　reasonably.　©　2018,　Science　Press.　All　right　reserved.