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

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

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