EE3008 2007-2008 SemA

EE3008 2007-2008 SemA - CITY UNIVERSITY OF HONG KONG-Course...

This preview shows pages 1–3. Sign up to view the full content.

CITY UNIVERSITY OF HONG KONG --------------------------------------- ---------------------- Course code & title : EE3008 Principles of Communications Session : Semester A 200712008 Time allowed : Two hours ------------------------- -------- This paper has FIVE pages (including this cover page). 1. This paper consists of FOUR questions. 2. Attempt all the FOUR questions. 3. Start a new page in the answering script for each question. ............................................................................................... Materials, aids & instruments permitted to be used during examination: 1. Non-programmable portable battery-operated calculator Special materials (other than standard materials e.g. answer book or supplementary sheets) to be supplied to students: Nil

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Question 1) (25 marks) Consider the following transmission method based on fir) shown in Fig.1. The data rate is 2.5kblsec. Let the transmitted signal . s(t) = sl(t) = AAt) if information bit "1" is transmitted, and . s(r) = so(i) = BAt) if information bit "0" is transmitted, where A and B are real constants. The probabilities of sending "0" and "1" are equal. The received signal is r(i)=s(t)+n(t), where n(t) represents channel noise. An optimal correlation receiver is shown in Fig. 2. Fig. 1 Sampling at t=T Fig.2 decision device reference signal At) (a) Determine the value of T above. [2 marks] (b) Find the expression for the spectrum offit). (Hint: Treat fir) as a rectangular pulse plus its delayed version with reversed sign. The Fourier transform of a rectangular pulse g(t) with non-zero duration [-212, 2/21 is given by
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 5

EE3008 2007-2008 SemA - CITY UNIVERSITY OF HONG KONG-Course...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online