| Summary: | 碩士 === 國立中山大學 === 通訊工程研究所 === 104 === The cognitive radio(CR) technology that can raise the utilization efficiency of precious frequency spectrum has been received much attention recently. The spectrum sensing technology determining whether a spectrum band is idle or not is the heart of CR techniques. In this thesis, we will focus on the spectrum sensing issue in a distributed cognitive radio network where there are one primary channel and multiple secondary user (SU) pairs, and the co-channel interference is present. Based on the energy detector, the distributed detection scheme of primary channel usage is derived and the throughput analysis of secondary user pairs is then carried
out by employing the AND, OR, and Majority fusion rules. Under the constraint on total
transmission power of SUs, we discuss the tradeoff problem between the increase of the number of SUs and the SU throughput. Another interesting issue of the secondary users’ transmission power allocation and throughput maximization in a distributed cognitive radio system is also studied under the constraints on the total SU transmit power and the interference thresholds on the PU and other SUs. The person by person optimization (PBPO) approach is used to solve the above optimization problem. Numerical simulations to evaluate the performance of the proposed issues are carried out for illustrations.
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