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I need to build basic code which including spreading a signal using walsh code.

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generate signal using QAM modulation,for  [0.7+0.7i; 0.7-0.7i; -0.7+0.7i; -0.7+0.7i]; Then I need to do spreading for that  using random column from Walsh code gotten by h = hadamard(4), Then transmit that signal through Rayleigh channel and add AWGN. In receiver, I need to detect that column which was used for spreading. the method of detection is to correlate the received data by all columns in matrix h and then take the |abs| of each one , then choose the maximum of them. The maximum value is correspondent into the index of column in Walsh matric (h)

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