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+Problem 4.1
+Problem 4.2
+Problem 4.3
+Problem 4.7
+Problem 4.8
+Problem 4.9
+Problem 4.11
+**Hints for Assignment 4:**
+  - Table B.1 provides values of Q(x) up to x = 3.4. For any other value of x, you may use Matlab to calculate Q(x) using the relationship Q(x) = 0.5 erfc[x/(2^0.5)].
+  - Though not derived in the class, you can Table 4.1 on page 219 for error probabilities of coherent and non-coherent versions of BPSK and BFSK.