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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312 CHAPTER 18. PROJECT 9: MPSK AND QAM DIGITAL TRANSMITTERS
xQ [ i ]=xQ [ i −1]; // setup xQ [] for the next input value
24 }
}
26
counter++;
28
output = output_gain ∗( yI ∗cosine [ counter &3] − yQ ∗sine [ counter&3]) ;
30
CodecDataOut . Channel [ LEFT ]=output ; // setup the LEFT value
32 CodecDataOut . Channel [ RIGHT ]=output ; // setup the RIGHT value
// end of my impulse modulated QPSK routine
An explanation of Listing 18.3 follows.
1. (Lines 2–6): Once per symbol period, we generate a random number that is bitwise
ANDed with 3. This bit masking operation generates the variable symbol which is
then used to access the QPSK lookup table. The appropriate ...
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