本期给大家带来5G NR中已知GSCN如何计算SSB的中心频率，用MATLAB实现，参考3GPP 38.104

下图是GSCN与SSB中心频率换算关系。

函数说明：

函数的入参是GSCN号

函数的输出是对应的SSB中心频率，单位MHZ

function freqency  = nr_5g_gscn2freq(gscn)

%

%

%

%author：老牛

% coding time 2024.10.23

% out freq unit MHZ

% refer to 3gpp TS 38.104

N = 0;

M = 0;

find_M = 0;

if gscn>=2 && gscn <= 7498  %0-3000MHZ

    for m = 1:2:5

        if mod(gscn - ((m-3)/2),3) == 0

            N = (gscn - ((m-3)/2))/3;

            M = m;

            find_M = 1;

            break;

        end

    end

    

    if find_M

        freqency = (N * 1200 + M * 50)*1e3;

    else

        freqency = 0;

    end

    freqency = freqency/1e6;

elseif gscn>=7499 && gscn <= 22255 %3000MHZ - 24250MHZ

     N = gscn - 7499;

     freqency = 3000 + N * 1.44;

elseif gscn>=22256 && gscn <= 26639 %3000MHZ - 24250MHZ

     N = gscn - 22256;

     freqency = 24250.08 + N * 17.28;

else

    freqency = 0;

    fprintf('error gscn %d\n',gscn);

end