Simulation environment for Software Defined Radio with application to Wideband CDMA

Software Defined Radio (SDR) switches across various wireless air interfaces by using a programmable and dynamically reconfigurable method and Wideband Code Division Multiple Access (WCDMA) is a promising candidate to be adopted into SDR. We implement WCDMA system in a SDR workbench in Matlab/Octave environment. Two scenarios are considered in this thesis. In non-adaptive scheme, the Channel State Information (CSI) is not known at the transmitter side. The signals are transmitted in a fixed rate and modulation method. In adaptive scheme, the transmitter has complete and accurate knowledge of the CSI so that adaptive modulation is applied to achieve high data rate transmission under a target BER. The performance of WCDMA is examined in both flat Rayleigh fading and frequency selective Rayleigh fading channel. In an attempt to accelerate simulation speed in Matlab/Octave, mixed C++/Matlab and C++/Octave programming is employed. It turns out that programming using C++/Matlab is more efficient than the Matlab code only when the size of matrix is not larger than 25; the simulation speed is slowed down by programming C++/Octave compared to Octave.