Husam Rafiq
Newbie level 3
I have a question ... could anyone help me to solve it
A QPSK signal is modeled as x(t)=Acos(w*t)+Asin(w*t), where A and B are either -1 or +1. A possible model for the I&Q mismatched is to model the mixer as ideal with non-ideal LOs. The inphase and quadrature mismatch LO is modeled as
L(t)=2(1+(epsilon/2))Acos(w*t - theta/2)
Q(t)=2(1-(epsilon/2))Asin(w*t + theta/2)
draw the constellation diagram of the downconverted received signals assuming that theta=30, and epselon=1/5 , and compare the constellation with that of ideally modulated QPSK
thanks in advanced
A QPSK signal is modeled as x(t)=Acos(w*t)+Asin(w*t), where A and B are either -1 or +1. A possible model for the I&Q mismatched is to model the mixer as ideal with non-ideal LOs. The inphase and quadrature mismatch LO is modeled as
L(t)=2(1+(epsilon/2))Acos(w*t - theta/2)
Q(t)=2(1-(epsilon/2))Asin(w*t + theta/2)
draw the constellation diagram of the downconverted received signals assuming that theta=30, and epselon=1/5 , and compare the constellation with that of ideally modulated QPSK
thanks in advanced
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