Abstract
A cooperative spectrum sensing CSS based on soft combine with decision fusion SC-DF-CSS is proposed and the detection performance is analysed further under the actual channel fading environment. The optimal algorithm to obtain the weighting vector for maximising the detection probability is given based on NP criterion. In order to reduce the complexity, the optimal algorithm for obtaining weighting vector based on modified deflection coefficient MDC is further given. The results show that only a little detection performance loss exists in SC-DF-CSS compared with CSS based on soft combine with data fusion, while the system bandwidth can be effectively saved by the former. In addition, it is also shown that the detection performance can be effectively improved by the optimal algorithm and the optimal algorithm based on MDC can achieve the same performance with the optimal algorithm based on NP criterion, which, however, reduces the computational complexity greatly.
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