Gemeinsamer Workshop von Universitaetsrechenzentrum und Professur "Rechnernetze und verteilte Systeme" der Fakultaet fuer Informatik der TU Chemnitz. Workshop-Thema: Mobilitaet Technik und Anwendungsmöglichkeiten des Mobilfunkstandards der 3. Generation unter Einbeziehung von Vorgänger-, Alternativ-, sowie Nachfolgesystemen.

The backbone of this dissertation is a discussion of the adaptability of optical fiber modes of transmission. The technological boom in commercial vehicles tends to include more electronic components and more data flow. The traditional copper transmission is reliable but has drawbacks. At present optical fiber, technology is in huge demand in fields like avionics, medicine, and communication across continents. The drastic shift to fiber was due to the enormous increase in capacity. Simultaneously the commercial vehicle sector is advancing in the direction of sensors that require a non-disruptive data flow. Furthermore, autonomous driving technology pushes the transition from copper to optic fiber. One expects optical fiber to supplant the traditional copper cables in the future. The dispersion and scattering losses need to be studied as well as the difference in cost.

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DS-CDMA is a popular multiple access technique used in many mobile networks to efficiently share channel resources between users in a cell. Synchronization between users maximizes the user capacity of these systems. However, it is difficult to perfectly synchronize users in the reverse link due to the geographic diversity of mobile users in the cell. As a result, most commercial DS-CDMA networks utilize an asynchronous reverse link resulting in a reduced user capacity. A possible compromise to increase the user capacity in the reverse link is to implement a quasi-synchronous timing scheme, a timing scheme in which users are allowed to be slightly out of synchronization. This paper suggests a possible way to implement a quasi-synchronous DS-CDMA reverse link using the method of “data chunking”. The basic premise is derived by making a link between TDMA and synchronous DS-CDMA. By considering some basic TDMA limitations, a proposed “data chunked” quasi-synchronous DS-CDMA system is derived from a TDMA system. The effects of such a system are compared to those of a chip interleaved system. MATLAB simulations are performed to analyze the performance of the system in the presence of small synchronization errors between users. Implementation of guard bands is explored to further reduce errors due to imperfect synchronization between users.

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