HW4 - ECEN 661 Modulation Theory Homework#4 Assignment Date Due Date g(t 1(Text 4.34 4th edition The information sequence cfw a n is a sequence of

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

View Full Document Right Arrow Icon
ECEN 661 - Modulation Theory Homework #4 Assignment Date: 2/13/08 Due Date: 2/20/08 1. (Text 4.34, 4th edition) The information sequence is a sequence of iid random variables, each taking values with equal probabilities. This sequence is to be transmitted at base- band by a biphase coding scheme, described by . where is shown in the figure. (a) Find the PSD of . (b) Assume that it is desirable to have a zero in the PSD at . To this end, we use a pre- coding scheme by introducing , where is some constant, and then transmit the sequence using the same pulse shape. Is it possible to choose to produce a frequency null at ? If yes, what are the appropriate values and the resulting power spectrum? (c) Now assume we want to have zeros at all multiples of . Is it possible to have these zeros with an appropriate choice of in the previous part? If not, then what kind of precod- ing do you suggest to result in the desired nulls? 2. (Text 5.6, 4th edition) Consider the low-pass equivalent (complex valued) signal , , with energy .
Background image of page 1

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

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/21/2012 for the course ECEN 611 taught by Professor Miller during the Spring '08 term at Texas A&M.

Page1 / 3

HW4 - ECEN 661 Modulation Theory Homework#4 Assignment Date Due Date g(t 1(Text 4.34 4th edition The information sequence cfw a n is a sequence of

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