BER Comparison between CDMA {&} COFDM Model

The work emphasizes the suitability of Coded orthogonal Frequency Division Multiplexing (COFDM) which is a technique of modulation for 3G transceiver systems. The performance of a COFDM system may be affected due to the main factors which were measured comprising of channel noise, multipath delay spread, distortion of the signal (clipping) & requirement of timing. Using MATLAB to access the performance of COFDM the computer simulations is performed [18]. In the 3rd generation mobile phone system CDMA modulation techniques is mainly proposed for Code Division Multiple Access (CDMA). For the comparison between the two techniques to be established Code Division Multiple Access was used. It was observed and found on examination that a very high tolerance to channel noise, peak power clipping, multipath delay spread as was provided by COFDM [12]. On observation total immunity to multipath delay spread was found in COFDM and provided less reflection time as compared to the guard interval used in COFDM signal. We are aware that multipath signal would provide strengthening to the received signal. Corresponding to multipath reflection of 30 km, delay spread up to 100?sec could be borne. Frequency selective fading strikes a problem due to the multipath and due to this the thing which comes into the picture is that the received signal is heavily attenuated as well as interference comes into existence.