Principles of Digital Communication
Robert G. Gallager
January 5, 2008
Cite as: Robert Gallager, course materials for 6.450 Principles of Digital Communications I, Fall 2006. MIT OpenCourseWare
(http:/ocw.mit.edu/), Massachusetts Institute of Technology.
1. In case of an accident, there is a high chance of getting lost. The transportation cost is very high each
time. However, if the infrastructure is set once, it will be very easy to use it repeatedly. Time for
wireless transmission is negligibl