December 2011
Intermediate to advanced
436 pages
18h 7m
English
book
Real-Time Digital Signal Processing from MATLAB® to C with the TMS320C6x DSPs, Second Edition, 2nd Edition
by Thad B. Welch, Cameron H.G. Wright, Michael G. Morrow
Content preview from Real-Time Digital Signal Processing from MATLAB® to C with the TMS320C6x DSPs, Second Edition, 2nd Edition
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Chapter 15
Project 6: Phase-Locked Loop
15.1 Theory
T
HE phase-locked loop (PLL) is widely used in communications receiver systems. Since
even the fundamental theory of phase-locked loops has been the topic of dozens of
textbooks, we will only briefly discuss, then implement, a single PLL design: a discretized,
second-order Costas loop [78, 79]. The simplified block diagram of such a system is shown
in Figure 15.1. In this figure, s[n] is the sampled input signal, m[n]isanestimateofthe
message signal, T isthesampleperiod,andω
c
is the carrier frequency.
The basic operation of the PLL is as follows. The incoming signal s[n] is processed
through a filter that ...
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