The nyquist condition for no isi developed in section

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: ncation and delay are required for physical realization. 4.3 Equalization For many physical channels, such as telephone lines, not only are they bandlimited, but they also introduce distortions in their passbands. Such a channel can be modeled by an LTI filter followed by an AWGN source as shown in Figure 4.7. This is the dispersive channel model we describe before. In general, ISI is often introduced. For a communication system system employing a linear modulation, such as BPSK, through a dispersive channel, the whole system can be described the conceptual model 4.8 Wong & Lok: Theory of Digital Communications HT ( f ) Ik 4. ISI & Equalization HC ( f ) HR ( f ) Impulses Decision every T AWGN Figure 4.8: Continuous-time communication model over a dispersive channel Á and ÀÌ ´ µ, À ´ µ, in Figure 4.8, in which the sequence of information symbols is denoted by and ÀÊ ´ µ are the transfer functions of the transmission (pulse-shaping) filter, the dispersive channel and the receiving filter3 , respectively. The Nyquist condition for no ISI...
View Full Document

This note was uploaded on 12/13/2012 for the course EEL 6535 taught by Professor Shea during the Spring '08 term at University of Florida.

Ask a homework question - tutors are online