Line coding - NTNU
Line coding - NTNU
Line coding - NTNU
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Coded sequences<br />
Digital Communication, <strong>Line</strong> codes and scrambling<br />
IET, <strong>NTNU</strong><br />
7<br />
AMI code (Alternate Mark Inversion)<br />
<br />
a k<br />
= 0 b = 0 k<br />
<br />
±1 b k<br />
=1 (alternating 1 and +1)<br />
The AMI code may be generated <br />
as shown in the figure:<br />
b k<br />
= 0: c k<br />
= c k1<br />
a k<br />
= 0<br />
b k<br />
=1: c k<br />
c k1<br />
a k<br />
=±1<br />
c k<br />
changes between 0 and 1each time b k<br />
=1<br />
+ zero DC component<br />
- may contain long sequences of 0 (poor timing recovery) <br />
Digital Communication, <strong>Line</strong> codes and scrambling<br />
IET, <strong>NTNU</strong><br />
8
Change language