how to perform frequency shift or frequency correction in simulation using HDL NCO and LOOKUP table(LUT) in order to generate HDL code

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Fayaz
Fayaz 2023-7-8
回答： Kranti Balaga 2023-7-9
for the below mentioned exponential part contain code,
% 5MHz carrier
fs = 7.68;
tdw=LTE5_3_1.waveform;
%% SHOLDER REMOVING
shape5_out = conv(tdw,shape5);
%% UPSAMPLING AND LOW PASS FILTERING
fs3 = 491.52;
up5_out = interp(shape5_out,64);
%% NCO operation
fc4 = 40; %shift by 40 Mhz
for ii = 1:length(up5_out)
carr_1shifted(ii) = up5_out(ii).*exp(1i*2*pi*fc4/fs3*ii);
end
data_complex = complex(real(up5_out), imag(up5_out));
complex_timeseries = timeseries(data_complex);

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采纳的回答

Kranti Balaga
Kranti Balaga 2023-7-9
Your logic can be replicated with the help of the NCO HDL followed by mulitplier. Similar application, we used to correct the frequency offset in our Simulink receivers. You can see here in the Coarse Frequency Compensator subsystem.

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