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16.3.4.8.4 Application Example. The DEMOD is used in the modulator. The following
example demonstrates how the function descriptor structure can be used to implement the
MOD function.
0
1
2
S
0
W
OFFSET + 0
OFFSET + 2
16.3.4.9 LMS1–COMPLEX COEFFICIENTS, COMPLEX SAMPLES, AND
REAL/COMPLEX SCALAR . The LMS1 function implements a basic FIR filter coefficients
update. The coefficients and input samples are complex numbers, but the scalar is a real or
complex number.
Figure 16-28. LMS1 Implementation Example
16.3.4.9.1 Coefficients and Sample Data Buffers. The coefficients vector occupies k
pairs of 16-bit half-words (real and imaginary components) in memory and C(0) is stored in
the first location. The samples input buffer is a cyclic buffer that contain M+1 bytes. Each
sample is a pair of 16-bit half-words (real and imaginary components) and the new sample
is stored in the address that follows the previous sample.
Figure 16-29. LMS1 Coefficients and Sample Data Buffers
MOTOROLA
3
4
5
6
7
I
0
0
0
0
I=3 (THREE ITERATIONS)
C n 1
+
C n i E X n i –
=
+
i
COEFFICIENTS
imag{C(0)}
real{C(0)}
imag{C(1)}
real{C(1)}
*
*
imag{C(k-1)}
real{C(k-1)}
2K bytes
MPC823e REFERENCE MANUAL
Communication Processor Module
8
9
10
11
0
0
0
×
INPUT SAMPLES
*
*
*
imag{X(n-k+1)}
real{X(n-k+1)}
*
*
imag{X(n-2)}
real{X(n-2)}
imag{X(n-1)}
real{X(n-1)}
imag{X(n)}
real{X(n)}
M + 1 bytes
12
13
14
15
01001
16-65
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