Hi,
I have one question regarding this quiz question. If water-filling is implemented in order (i.e., link1, link2 and link3), the answer shown below can be obtained. However, if water-filling is implemented in another order, e.g., link1, link3 and link2, x0 = 1, x1 = 1, x2 = 3 and x3 = 7 will be obtained. Is there an order requirement when we use the water-filling algorithm?
I am also wondering in the given answer, link 3 is not saturated. Doesn't the min-max fair allocation require the saturated link?
Thanks!