pcshw2 - THE STATE UNIVERSITY OF NEW JERSEY RUTGERS College...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: THE STATE UNIVERSITY OF NEW JERSEY RUTGERS College of Engineering Department of Electrical and Computer Engineering 332:322 Principles of Communications Systems Spring Problem Set 2 1. When Is a Carrier a Good Carrier?: Given an information signal m ( t ) you want to gen- erate r ( t ) = Am ( t ) cos(2 πf c t ) (1) However, life (your professor) is unkind and you’re only allowed to use cos 3 (2 πf c t ) as your carrier signal. That is, the first stage of your transmitter block diagram with m ( t ) as the input is going to be a multiplication by cos 3 (2 πf c t ) (instead of the usual sane cos(2 πf c t ) ). (a) Assume you can build any linear time invariant (LTI) filter you’d like. Can you fil- ter the output of the multiplier to obtain the desired signal? If so, what is the filter characteristic? (b) Suppose cos 2 (2 πf c t ) is the carrier. Repeat the previous part. (c) Suppose we generalize the carrier to be cos n (2 πf c t ) for n > 2 . When can you generate the desired r ( t ) using LTI filters. 2. Simple Envelope Detection: Consider the following AM signal s ( t ) = A c [1 + λ cos(2 πf m t )] cos (2 πf c t ) (2) The modulation factor is λ = 1 and f c À f m . The AM signal is applied to an ideal envelope....
View Full Document

This homework help was uploaded on 04/03/2008 for the course ECE ECE332 taught by Professor Rose during the Spring '08 term at Rutgers.

Page1 / 2

pcshw2 - THE STATE UNIVERSITY OF NEW JERSEY RUTGERS College...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online