Accuracy of Bit Error Probability for W-CDMA System Using Code Tree

A H Ibrahim

doi:10.48084/etasr.1991

Abstract

W-CDMA is radio access utilized for 3G cell frameworks. A code tree allocation scheme is one of the most explored channelization techniques, used to improve system performance and capacity through adjustable data rates. This work investigates the accuracy of bit error probability for W-CDMA system using code tree orthogonal variable spreading factor (OVSF) codes, compared to pseudo-noise (PN) codes under various noise conditions, such as additive white Gaussian Noise (AWGN) and Random Noise (RN). Results are carried out theoretically and by computer simulation. The simulation includes the scenario of simple model representation for W-CDMA system. It was concluded that, the system has better performance using OVSF compared with PN code under different noisy channels.

Highlights

Data spreading in W-code division multiple access (CDMA) systems is done by the application of a signal independent code
The main idea of this paper is to identify the system implemented to assess the performance of the orthogonal variable spreading factor (OVSF) Code tree and PN code under channel environment
The other advantage of OVSF code tree is that the variable data give the user an opportunity to introduce the system as well as if it were in good condition

Summary

INTRODUCTION

Data spreading in W-CDMA systems is done by the application of a signal independent code. The scenario studies the efficiency performance of OVSF code tree in WCDMA system under two different data under noise comparing to PN code. The tree structure code method is usually assigned to certain users with different data rates orthogonally. PN-CODE ALGORITHM A pseudo-noise (PN) used for direct sequence spreading code consists of NDS components, named chips. These chips require 2 values: either -1/1 or 0/1. PN sequences are periodic structures that have similar behavior with noise [10] This code is generated by using shift registers, module adders represented by XOR gates and feedback loops. This code is used to determine the frequency spectrum that the produced signal will lodge.

PROPOSED SYSTEM

BIT ERROR PROBABILITY

RESULTS

CONCLUSION