TAILIEUCHUNG - Lecture Digital communication systems - Lecture 7

In this chapter, you will learn: understand that books are the oldest form of mass communications, recognize the factors that led to the commercialization of book publishing, explain how the digital revolution may change the underlying structure of the book industry, identify the main parts of the book industry, understand the -economics that support the book industry. | ffl 00 00 oo 00 00 00 00 00 00 COMMUNICATION SUSTEMS Fall 2012 Lecture 7 Viterbi decoding of convolutional codes Path and branch metrics Hard-decision soft-decision decoding Performance issues decoder complexity postdecoding BER free distance concept Fall 2012 Lecture 7 Slide 1 Convolutional Codes Coding review Decoding via Viterbi algorithm Fall 2012 Lecture 7 Slide 2 Key Concept for Coding and Decoding Trellis x n-1 x n-2 STARTING STATE 0 00 2K-1 states 1 11 00 10 0 10 1 01 1 00 0 11 1 10 0 01 01 11 00 01 10 11 0 00 1 11 0 11 1 00 0 10 1 01 0 01 1 10 e time Example K 3 rate-72 convolutional code - g0 111 p0 n 1 x n 1 x n-1 1 x n-2 - g1 101 p1 n 1 x n 0 x n-1 1 x n-2 States labeled with x n-1 x n-2 Arcs labeled with x n pcp1 Fall 2012 Lecture 7 Slide

• Kĩ thuật Viễn thông
• Communication systems
• Digital communication systems
• Digital communication
• Multiuser communication
• Multicarrier system
• Adaptive equalization
• Filter channel
• communication systems research
• communication applications
• electronic media
• communication solutions
• systems management