PERFORMANCE IMPROVEMENT IN WCDMA SYSTEM SUBJECTED TO INCREASED DATA RATE AND INTERFERENCE CHANNELS USING COMPENSATION FOR ERRORS

Abstract

Most mobile operators have rolled out third generation (3G) networks which have more benefits compared to first and second generation networks since it can support voice, data and multimedia applications. The rise in demand for integrated services (capacity) has led to interchannel and inter-symbol interference among the users and on transmission the signal is degraded again due to interference channels along the path. The digital signal processing techniques are applied in third generation (3G) mobile communication systems to reduce interference and power consumption. The main objective is to develop wideband code division multiple access (WCDMA) system model whose performance has been improved by applying compensation for errors. This model is subjected to an interference channels and data rate increased from 64kbps to 2Mbps. The computer simulation tool (Matlab 7.8) is used to develop and evaluate the bit error rate (BER) performance of the system. The model is developed in Simulink which has blocks in the communication blockset which have parameters for simulation of the system. The bit error rate (BERs) is calculated at the receiver with/without compensation of errors. For a data rate of 2Mbps, the average error rate is 0.4817 with error correction and 0.5165 without correction in an additive white Gaussian channel (AWGN). In conclusion, the performance of the WCDMA model improves by 6.74% at 2Mbps, 5.59% at 384kbps, 5.79% at 144kbps and 5.32% 64kbps. This shows that the performance of the system improves by using this method when the data rate is increased in an additive white Gaussian channel. It also performs better at higher rates than in lower rates.