one of the limitations of orthogonal frequency division multiplexing (ofdm) in many applications is its sensitivity to frequency shifts, errors normally referred to as carrier frequency offset (cfo). although, this small offset is negligible in conventional single carrier communication systems, it is a severe problem in the ofdm systems. because, the carriers in ofdm are inherently closely spac...

purpose: to examine the effectiveness of group cognitive-behavioral therapy (cbt) based on schema on impulsiveness of substance abusers in karaj. materials and methods: this study was quasi-experimental with pre-test, post-test and control group. the statistical population of this study consisted of male substance abusers who referred to addiction treatment clinics of karaj in 2010. the sample ...