Algorithm 3 Summary of joint channel-frequency selection algorithm
Define:  [1] Iteration stopping criterion: the normalized difference between labels predicted in two successive iterations being less than a predefined threshold δ3.
[2] Algorithm1{F0} represents performing Algorithm 1 with a frequency band F0; similarly, Algorithm2{Q0} means performing Algorithm 2 with a given subset of channels Q0.
Input: a frequency band F0
iter = 1
Repeat
Qs = Algorithm1{F0},
Fs = Algorithm2{Qs}, corresponding predicted labels
iter = iter + 1
Until stopping criterion satisfied
Output: the frequency band Fs, the subset of channels Qs and the corresponding labels