In the last years mobile radio systems have suffered a spectacular development. This resulted in the new pan european GSM standard. It is expected that such development extends to the designated personal communication systems, from which the mobile radio system is part. To satisfy the demand for new telecommunication services unused radiofrequency wide bands are not available. So, these new services will have to coexist with the other types of telecommunication systems in the bands already occupied by these later. It was proved that the spread spectrum systems are the best in this situation due to its low level of interference and greater capacity when compared to any other multiple access technique. This thesis studies spread spectrum systems applied to mobile digital radio. Computations of these systems performance is done by two different methods, for several types of modulations, diverse types of communication channels, in particular the mobile radio one, and several types of spread spectrum systems.Available from Fundacao para a Ciencia e a Tecnologia, Servico de Informacao e Documentacao, Av. D. Carlos I, 126, 1249-074 Lisboa, Portugal / FCT - Fundação para o Ciência e a TecnologiaSIGLEPTPortuga
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