In　order　to　improve　the　performance　of　differential　code　shifted　reference(DCSR)UWB　receiver　in　the　presence　of　narrowband　interference(NBI),　a　new　improved　DCSR　receiver　based　on　Teager-Kaiser　operator(TKO)is　proposed.　By　using　the　nonlinear　TKO,　the　NBI　is　shifted　to　a　frequency　band　close　to　DC,　and　hence　can　be　removed　by　a　following　analog　high　pass　filter.　The　simulation　results　show　that　the　proposed　receiver　can　greatly　mitigate　the　narrowband　interference(NBI),　even　in　the　scenario　that　no　NBI　exist　the　proposed　receiver　still　outperform　the　original　DCSR　and　TR　receiver.　Comparing　with　the　original　DCSR,　the　TKO-DCSR　receiver　achieves　significantly　performance　improvement　at　the　cost　of　a　little　increase　in　complexity,　this　advantage　makes　it　a　promising　technology　for　wireless　sensor　networks.