# Kevin buckley 2007 9 example 6 cpm consider the cpm

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Unformatted text preview: 000000001111111111 11111111110000000000 00000000001111111111 1111111111 00000000001111111111 11111111111111111111 00000000000000000000 10 42 42 11111111111111111111 00000000000000000000 11111111111111111111 00000000000000000000 1 0 1 0 1 0 1 0 11111111111111111111 00000000000000000000 1 0 1 0 1 0 1 0 14 Figure 3: Illustration of the Viterbi algorithm for PRS MLSE. Kevin Buckley - 2007 9 Example 6 - CPM: Consider the CPM modulation scheme described in Example 2 5 from Lecture 4. That is, L = 2, h = 3 and M = 2 with symbols In = ±1. The cost at stage n is on the form r (nT ) − 2E 2 cos[2πfc t + θn + 2π (In q (0) + In−1 q (T ))] T 3 1 8 2 . (19) 2 Let fc T = 3 , E = T , q (0) = 2 and q (T ) = 3 . The cost is then 8 2 1 1 4 r (nT ) − cos[ 3πn + θn + π ( In + In−1 )] [ 6 2 . (20) Assume that the initial state if S0 = {θ1 , I0 } = {0, 1}. Determine the MLSE estimate I1 , I2 , I3 , I4 given data {r1 , r2 , r3 , r4 } = Kevin Buckley - 2007 10 For the DPSK, PRS and CPM MLSE problems discussed in this subsection, Viterbi pruning is opti...
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## This document was uploaded on 10/12/2009.

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