Matlab Simulation of Digital (QPSK) Line-of-Sight Radio Link

Telecommunication system is one of the major components in industry. It can be
summarized as the transmission, reception, and processing of information between two
or more locations, using either digital or analogue transmission. Wireless technologies
become essential when guided media connections are difficult to provide economically.
Wireless communication system affected by external (atmosphere) factors. Studies need
to be done at certain places before actual communication system been implemented. The
wireless transmissions over large water areas are different as compared to transmission
over land in term of propagation conditions, radio wave reflection over water and
ducting, which make them more difficult to design. However, they are very essential to
remote-island or off-shore location to communicate with offices on main land.
The main objective of this project is to develop a MATLAB simulation for QPSK that
considered external factors in radio transmission. The analysis carried out was on BER
performance for QPSK system, phasor and constellation analysis. This analysis is to
determine that the simulation is well defined with the theoretical value. Factors involved
in determining system performance such as multipath fading and AWGN also has been
considered. The simulation output of the Maximal Ratio Combining (MRC) Space
Diversity configuration for multiple receive antennas which shows the improvement in
the received signal is also been analyzed.