better print

README.md

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@@ -440,6 +449,9 @@ B &= \begin{cases}
 
 <!-- MATH END -->
 
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 ## Noise performance
 
 Coherent detection system.
@@ -764,6 +776,9 @@ Remember that $T=2T_b$
 | $I(t)$ (Odd, 1st bits)  | ![QPSK bits](/images/qpsk-it.svg)   |
 | $Q(t)$ (Even, 2nd bits) | ![QPSK bits](/images/qpsk-qt.svg)   |
 
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 ## Matched filter
 
 ### 1. Filter function
@@ -1005,6 +1020,9 @@ Adapted from table 11.4 M F Mesiya - Contemporary Communication Systems
 - Minimum distance between any two point
 - Different from bit error since a symbol can contain multiple bits
 
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 ## Information theory
 
 ### Entropy for discrete random variables
@@ -1176,6 +1194,9 @@ C=\frac{1}{2}\log_2\left(1+\frac{P_\text{av}}{N_0/2}\right)
 
 <!-- MATH END -->
 
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 ## Channel code
 
 Note: Define XOR ($\oplus$) as exclusive OR, or modulo-2 addition.