THE USE OF “GOTO FUNCTION BLOCK” AND “DELAY FUNCTION BLOCK” IN THE DESIGN AND SIMULATION OF CDMA 2000 1 X RTT PHYSICAL LAYER RADIO CONFIGURATION 3—FORWARD FUNDAMENTAL CHANNEL
Efuribe, Ezinna Lucky
Department of Physics
Michael Okpara University of Agriculture Umudike, Nigeria
ABSTRACT
MATLAB is a technical language that can be used for a variety of studies in science. One of its toolboxes: “simulink” along with other toolboxes can be use in modeling a communication system. My research was mainly prompted by the problem of poor GSM services in our country, Nigeria. In the course of searching for a better alternative to the GSM technology, I discovered CDMA 2000 1x RTT. The evidences to show that CDMA 2000 1x RTT is a better technology than the GSM are contained in the comparisons (between some of the GSM’s and CDMA-one’s parameters), made by Qualcomm, an American-based Telecom. Company. CDMA 2000 1x RTT is an improved version of CDMA-one (also known as IS-95). It was originally developed by Qualcomm. In order to portray (on the screen) the physical layer for the Forward Fundamental Channel-Radio Configuration 3 of CDMA 2000 1x RTT, I decided to use some already built functions in MATLAB 7.1 version to achieve this. Interactive blocks in the communication toolbox contained in the MATLAB software were used extensively in this modeling. Results showing the performances of the system at various stages in the network were also obtained, using the Spectrum Scope and the Scatter Plot Display Blocks. Results obtained showed that if the transmitted signal was to be tapped at undue stages in the network, poor (unclear) signal will be received. A clear signal can only be received when measures have been put in place to counter the effect of signal distortion by noise and establishing a system that will perform direct opposite functions as those done by the transmitter subsystem and the encoder subsystem.
Keyword: Matlab, CDMA, Telecommunication