Analysis of Simulation Parameters of Pulse Shaping FIR Filter for WCDMA

Abstract

Digital Signal processing techniques are being used to improve the performance of 3G systems. W-CDMA (known as IMT-2000 direct spread spectrum) is a third-generation (3G) mobile wireless technology that promises much higher data speeds to mobile and portable wireless devices than commonly offered in today's market. W-CDMA can support mobile/portable voice, images, data, and video communications at up to 2 Mbps (local area access) or 384 Kbps (wide area access). It enables several users to transmit their information over the same channel bandwidth. In the mode of transmission a trade off exists between bandwidth containment in frequency domain and ripple attenuation in time domain. It is this trade off of bandwidth containment versus ripple amplitude is considered during system design when developing a data transmission system that employs pulse shaping.

This thesis involves the application of signal processing techniques to wireless communications in emerging area of WCDMA that can help to achieve improvement in results related to transmission performance. The objective of our work is related with industrial viewpoint application design that involves advanced signal processing technology that can increase the wireless system capacity and also improve the communication quality including the reduction of all types of interference. This work deals with simulation model of square root raised cosine pulse shaping filter for WCDMA with different parameters of the filter. Our work deals with study of Simulation Parameters (Number of Bits, Number of Errors) of Pulse Shaping FIR Filter at different group delay and roll off factor for WCDMA. We have tested WCDMA model at different SNR by using scatter plot eye diagram and spectrum scope to find out optimum value of delay and roll off factor of root raise cosine filter that can give minimum bit error.