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QPSK Modulation without using Simulink

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ronu008

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Hi,

I am planning to code QPSK modulation technique. I have referred many codes online and found that many are using complex representation to generate QPSK modulated signal. I dont understand that Part. Why we need to represent QPSK signal in complex numbers? Please help me understanding concept.
 

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How can i generate an OFDM signal using matlab? Please help:
 

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