III
DESIGN OF ADAPTIVE FILTER BASED ON FPGA
ABSTRACT
Compared with analog filter, digital filter has the advantages of high signal
to noise ratio, good performance of transition zone, high reliability and
expansibility, flexible and convenient design and application. With development
of special digital signal processing chip, digital filter CAN achieve performance
and processing speed has been greatly improved, the realization of the use of the
better performance of digital chip design more complex filter, so that the adaptive
filter realization and application become possible, FPGA (field programmable
gate array) is a new type of digital signal processing chip, with parallel processing
of data and CAN use hardware programming language directly the characteristics
of the hardware design, is currently a hot research topic for study of adaptive filter
is implemented on FPGA.
The Matlab simulation of the adaptive filter, to understand the characteristics
of the structure and operation characteristics, and the use of Matlab generating
test signals and FPGA simulation software Modelsim joint behavior simulation of
FPGA design, then to Altera cyclone IV series chip ep4ce15f17c8 as the carrier
of the development board for simulation design, in the design process, make full
use of FPGA parallel processing and fast digital signal processing for structural
design. On this basis, the following work has been done:
The filter needed to fully understand, adaptive transversal filter, adaptive
notch filter and FFT transform based on the principle of selection and build a
design platform, first in the basic research of current FPGA adaptive transversal
filter realization, using modular design method, the structure is divided into single
and serial FIR filter module serial LMS weight update module, the design of the
two modules and integrated were designed, and simulation experiments, through
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