mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 517

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

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.
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.
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.
OFFSET + 0
OFFSET + 2
0
S
Figure 16-29. LMS1 Coefficients and Sample Data Buffers
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Figure 16-28. LMS1 Implementation Example
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COEFFICIENTS
imag{C(k-1)}
real{C(k-1)}
imag{C(0)}
imag{C(1)}
real{C(0)}
real{C(1)}
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MPC823 REFERENCE MANUAL
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C n 1
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I=3 (THREE ITERATIONS)
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INPUT SAMPLES
imag{X(n-k+1)}
real{X(n-k+1)}
imag{X(n-2)}
imag{X(n-1)}
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real{X(n-2)}
real{X(n-1)}
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imag{X(n)}
real{X(n)}
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Communication Processor Module
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