Engineering Question

Anonymous
timer Asked: Nov 14th, 2016

Question description

Hi, I have difficulty starting with communication theory. I understand the source signal u(t) goes through a transmitter and amplified by a factor then we get s(t). After it passes the channel a white noise is added to it with certain power density r(t)=s(t)+n. At receiver side we scale down this signal in order to minimize the noise n, v(t) = a · r(t).

But I have no idea how to choose this scale down factor a. I understand that if you amplify it as much as possible at transmitter side then scale it down to original size most of the noise will be reduced. For example s(t) = a · u(t), then at receiver side v(t) = 1/a * r(t), thus the 2 a will be canceled.

But from the question and answer I have it seems different, I have no idea how that optimal alpha factor is calculated.

Engineering Question
question_answer.png
Engineering Question
question_answer.png

Tutor Answer

(Top Tutor) Studypool Tutor
School: Purdue University
Studypool has helped 1,244,100 students
flag Report DMCA
Similar Questions
Hot Questions
Related Tags
Study Guides

Brown University





1271 Tutors

California Institute of Technology




2131 Tutors

Carnegie Mellon University




982 Tutors

Columbia University





1256 Tutors

Dartmouth University





2113 Tutors

Emory University





2279 Tutors

Harvard University





599 Tutors

Massachusetts Institute of Technology



2319 Tutors

New York University





1645 Tutors

Notre Dam University





1911 Tutors

Oklahoma University





2122 Tutors

Pennsylvania State University





932 Tutors

Princeton University





1211 Tutors

Stanford University





983 Tutors

University of California





1282 Tutors

Oxford University





123 Tutors

Yale University





2325 Tutors