Optimization of co-operative spectrum sensing network with multiple antennas in weibull fading channel using improved energy detector

Spectrum sensing is an important task to find out the spectrum holes in a given radio spectrum. Spectrum sensing performance is improved with aid of multiple cognitive radios (CRs) in the network and each CR having multiple antennas. In this paper, we are considering that each CR having multiple antennas and improved energy detector (IED) is used for detection of primary user (PU). We have derived the novel expression for missed detection probability (P_m), closed form of equations to find out optimum value of number of CR users (N_opt), optimum value of normalized threshold value (λ_{n, opt}) and optimum value of arbitrary power of the received signals (popt) under Weibull fading channel. Performance is evaluated in terms of total error for various values of SNR & normalized threshold, optimizing the network parameters such as number of CR users (N), normalized threshold value (λ) and arbitrary power (p) of received signals of a PU. It is also observed that performance is improved by using multiple antennas at each CR. Comparison between Rayleigh fading and Weibull fading channels are also provided.