pdcch_cce.m

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%  N_RB is the number of resource block on the downlink transmission

%  n_PHICH is the number of REG used for the transmission of PHICH.
%  N_symb is the number of OFDM symbols used for transmission of PDCCHs in a subframe.
%  N_CCE is the number of CCE about PDCCH.
%  N_REG is the number of REG about PDCCH.

function [N_REG,N_CCE] = PDCCH_CCE(N_RB,n_PHICH,N_symb,p )
switch N_symb             %OFDM符号
    case 1
        N_REG = N_RB * 2 - n_PHICH - 4;%每个RB中有2个或3个REG；4是指用来传PCFICH的REG数；
        N_CCE = floor(N_REG/9);
    case 2
        if P == 4
            N_REG = N_RB * (2+2) - n_PHICH - 4;
            N_CCE = floor(N_REG/9);
        else
            N_REG = N_RB * (2+3) - n_PHICH - 4;
            N_CCE = floor(N_REG/9);
        end;
    case 3
        if P == 4
            N_REG = N_RB * (2+2+3) - n_PHICH - 4;
            N_CCE = floor(N_REG/9);
        else
            N_REG = N_RB * (2+3+3) - n_PHICH - 4;
            N_CCE = floor(N_REG/9);
        end;
    case 4
        if P == 4
                N_REG = N_RB * (2+2+3+3) - n_PHICH - 4;
                N_CCE = floor(N_REG/9);
            
        else
                N_REG = N_RB * (2+3+3+3) - n_PHICH - 4;
                N_CCE = floor(N_REG/9);
          
        end;
end;