PS08 - University of Illinois Spring 2011 ECE 361: Problem...

Info iconThis preview shows page 1. Sign up to view the full content.

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

Unformatted text preview: University of Illinois Spring 2011 ECE 361: Problem Set 8 Equalizers in Band-Limited Communications Due: Thursday April 7 at 9:30 a.m. Reading: Lecture Notes: Lectures 15-18 1. [Zero-forcing transversal filter] The discrete-time model for a band-limited channel has as channel response the sequence- . 05 , . 2 , 1 . , . 3 ,- . 07 Design a two-stage three-tap equalizer for this channel. The symbol X [ m ] will appear in Y [ m ] (where it is the desired symbol) but not in the ISI affecting Y [ m + 1] and Y [ m- 1] where it is forced to zero. However, X [ m ] might appear in the ISI affecting other symbols. What is the coefficient of X [ m ] in the ISI affecting Y [ m + 2] and Y [ m- 2]? How does this compare with how much X [ m ] affects Y [ m + 2] and Y [ m- 2]? Has zero-forcing helped or hurt these symbols farther away? 2. [Comparison of equalizers] The received signal in a communication system operating over a band-limited channel is Y [ m ] = X [ m ] + 0 . 5 X [ m- 1] +...
View Full Document

Ask a homework question - tutors are online