Algorithm 1 SVO algorithm: determining the number of sensors.

Set$Q=Qinit\ge N$ 1. Optimize$\Xi$to obtain${\Xi }_{opt}\left(Q\right)$ If the curve${\Xi }_{opt}\left(Q\right)$is not saturated.$$       $Q=Q+1$ goto 1$$ Choose$Q_{opt}$as the value ofQassociated to the knee