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In this paper, we analyzed performance of secondary user networks based on interface temperature model. We compared the performance of the single channel of a secondary user and multiple access secondary user networks. A secondary user determines the maximum transmission power and select proper modulation scheme using adaptive transmission scheme for a single secondary user result in the high throughput of the secondary user. In case of multiple access secondary user networks, the number of available secondary users is increased when the average distance of the cluster of secondary user networks is increased.