Add "FAR vs PD"

FAR vs PD/get_Psi.m

@@ -0,0 +1,11 @@
+function Psi = get_Psi(N, M, epi)
+    Psi = zeros(N,M*N);
+    for n = 0 : N-1
+        Cn = floor(rand()*M);
+        for q = 0 : N-1
+            for p = 0:M-1
+                Psi(n+1,q*M+p+1) = exp(1i*2*pi*p/M*Cn+1i*2*pi*q/N*n*(1+Cn*epi)) / sqrt(N);
+            end
+        end
+    end
+end