Fixes veeresht#6

Author: veeresht

commpy/channels.py

@@ -95,7 +95,7 @@ def awgn(input_signal, snr_dB, rate=1.0):
     noise_variance = avg_energy/(2*rate*snr_linear)
 
     if input_signal.dtype is complex:
-        noise = sqrt(noise_variance) * randn(len(input_signal)) * (1+1j)
+        noise = (sqrt(noise_variance) * randn(len(input_signal))) + (sqrt(noise_variance) * randn(len(input_signal))*1j)
     else:
         noise = sqrt(2*noise_variance) * randn(len(input_signal))