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单活辉：CDMA 系统的研究与 MATLAB 仿真
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CDMA system research and simulation by MATLAB
Abstract
CDMA (Code Division Multiple Access) is a branch technology which based
on the spectrum-spread of the digital communication. The spectrum spread is
a kind of technology that expands the original signal frequency spectrum to
a wide band in the transmission. It discriminates different users mainly by
the different mutual orthogonal (or as far as possible orthogonal) random
code. It can realize the communication which multi-users utilize the same
frequency to connect to the system and the network. CDMA become more and
more mature through the developments of several networks. The development
of CDMA is very quick in China nowadays. The network configuration of CDMA
is basically self-contained. CDMA will exert important functions in
communication field as GSM in the future, but the amalgamation of CDMA and
GSM is another direction. The simulation is the base of a system before it
is used in the life, through which we can find the problems and correct
them. Matlab is one of the most popular and vigorous software massively
applied in science operation, automatic control, science cartography and
correspondence simulation.
In my design, after studying the DS-CDMA system theory, take the Matlab
to simulate it, mainly containing the PN code wide frequency design, the
QPSK(Quadrature Reference Phase Shift Keying) modulation and demodulation
