Optimal Resource Allocation for Energy-Efficient OFDMA Networks

Algorithm 2

Optimal energy-efficient power allocation (OEPA) algorithm.

Input:   and

Output:   and

() Based on , calculate ;

() for  each user   do

()  sort user 's subcarriers in ascending order such that , where . Let ;

()  for   : 1  do

()   ;

()   if    then

()    break;

()   end if

()  end for

() end for

() if    then

() return   and ;

() end if

() sort and jointly in ascending order to divide the interval into water-level

      rise intervals , and each into continuous power intervals

      , where

() ;

() for  each water-level rise interval   do

() for  each continuous power interval   do

()  if  flag = 0  then

()   Calculate , where , , and

     ;

()   if    then

()    ;

()    if    then

()     return   and ;

()    end if

()   end if

()  else

()   calculate by (21);

()   if    then

()    return   and ;

()   end if

()  end if

() end for

() end for