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Detection is compromised when a cognitive radio (CR) user experiences deep shadowing or fading effects. In order to detect the primary user (PU) more accurately, we allow the CR users to cooperate by sharing their information. In this paper we investigate performance of cooperative spectrum sensing scheme using energy detection (ED-CSS) to improve the sensing performance in channels such as Rician and Weibull fading channels. Hard decision combining rule (OR-rule, AND-rule and MAJORITY-rule) is performed at fusion center (FC). The performances of ED-CSS for several values of average SNR are characterized through complementary receiver operating characteristic (ROC) curves (plot of Q _m vs. Q _f ). A comparative performance of ED-CSS has been studied for various data fusion rules in Rician as well as Weibull fading channels.