Algorithm 1 Construction of hopping sequence $H{S}_i$ for rendezvous operation of a SU transmitter i.

Input:$X_i$, $Y_i$;

Output: $H{S}_i$

1: Randomize the order of $X_i$;

2: $H{S}_i\leftarrow \varnothing$;

3. $k\leftarrow 1$;

4: while $k\le {\left(Y_i\right)}^2$ do

5:  $H{S}_i\left(k\right)\leftarrow X_i(k\mathrm{rem}{Y}_i+1)$;

6:  $k\leftarrow k+1$;

7: end while

8: return $H{S}_i$;