SNR =2;
Fs=12e6;
Fc = 2.4e9;
d = 5; lambda = physconst('LightSpeed')/Fc;
data=randi([0 1],3000,1);
hMod = comm.OQPSKModulator('BitInput',true);
modulated_sgl = step(hMod, data);
pathloss_dB = fspl(d,lambda);
tx_sgl = modulated_sgl * pathloss_dB ;

hss = dsp.SpectrumAnalyzer('SampleRate', Fs);
step(hss,[tx_sgl modulated_sgl]);
release(hss);