“…However, shadowing effects and multipath fading severely affect the sensing performance of users in the CPS. To improve the sensing performance of the CPS, Zhang et al 7 proposed a soft fusion‐based cooperative spectrum sensing algorithm, which adopts improved particle swarm optimization (IPSO) to find the optimal weighting coefficients for soft fusion. IPSO maintains the diversity of particles by introducing an immune algorithm and chaotic sequence mechanisms to speed up the convergence of the algorithm.…”