Análise de desempenho de sistemas CDMA, utilizando multi-portadoras e multi-códigos

Abstract

The technology advance in telecommunication systems shows that un- countable and di®erent systems have been raised every day. These systems suit to the market needs in terms of evolution. The wide variety of services o®ered every day by the mobile communication systems is response of the need for access and their utilization. This work analyzes the performance of three systems: Multi-Carrier CDMA, Multi-Code CDMA and Multi-Carrier Multi-Code CDMA, with multi-service rate, using the BPSK modulation. The model for these systems is composed by the transmitter and receiver, with an analysis of the signal /noise plus interference ratio (SNIR) and the mean bit error probability (mean Pe). The performance of these systems is presented based on the comparison of num- ber of sub-streams, number of carriers, number of users, fading parameters, diversity order and propagation multi-path properties. The Multi-Carrier and Multi-Code CDMA systems showed a better per- formance, in terms of SNIR and mean bit error probability, when compared to the Multi-Carrier CDMA and Multi-Code CDMA Systems.