Design of Orthogonal Variable Spreading Factor (OVSF) Performance Simulation Program in  Multipath Fading Channels

I Gede Arya Gangga Gajanada; Nyoman Pramaita; I Gusti Agung Komang Diafari Djuni Hartawan

doi:10.24843/JEEI.2020.v04.i02.p05

I Gede Arya Gangga Gajanada Department Electrical Engineering Faculty of Engineering at Udayana University
Nyoman Pramaita Department Electrical Engineering Faculty of Engineering at Udayana University
I Gusti Agung Komang Diafari Djuni Hartawan Department Electrical Engineering Faculty of Engineering at Udayana University

DOI: https://doi.org/10.24843/JEEI.2020.v04.i02.p05

Abstract

The characteristics of wireless channel are determined by multipath propagation. The transmitted signal will be scattered so that it produces fading. Fading influenced by multipath component will cause delay spread which damages the signal. Thus, spread spectrum technology is used by using a bandwidth that is greater than the original signal. The objective of this study was to determine the effect of the number of multipath components on orthogonal variable spreading factor (OVSF) codes on multipath fading channels viewed from values and Bit Error Rate (BER) graphs versus Energy Bits per Noise (Eb/No). This study would compare the performance of OVSF code communication system on multipath channels by varying multipath components of 4, 8, 12, 16 and the length of OVSF codes used of 16, 8 and 4. The simulation results showed an increase in BER values when the number of multipath components was added. The more the number of multipath components used, the more the number of reflected signals that will interfere with the desired signal in the receiver. The length of the OVSF code influences the performance of the OVSF code on the multipath fading channel, because each code has a different processing gain value that is affected by the length of the code used

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