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The renewed interest in the application of the spread sprectrum technique to mobile mdio systems, both in the U.S. and now within Eurupe thruugh the RACE II and U.K. DTI/SERC LINK programs continues to gather momentum. To this end, an analytical performance model has been developed at Bristol in order to provide a greater insight into the opemtion of this technique, in particular the sensitivity of the bandwidth eficiency of the network to the form of diversity signal processing employed in the mobile tmnsceiver. This theme is continued in this paper with an investigation of the wideband channel characteristics of an urban service area. Results are presented relating the statistics of the R A K E receiver bmnches to the spreading bandwidth employed.

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With) the development of both n a r r o w b m d and wideband D S -C D M A s y s t e m s there has been m u c h interest in establishing the optismum spread spectru,m bandw%dth. Previous publications by the authors have indica,ted the importance of the bandwidth allocation in, determining the D S -C D M A system's ability to exploit the temporally dispersive effects of the mobile radio chann,el. This paper discusses s o m e of the issues concerning the o p t i m u m spread spectrum bandwidth foruse in proposed 3rd generation systems, such as th.e European Universal Mobile Telecommunications S y s t e m (UMTS), based upon recent system-specific ,uiideband channel soundiuy measurements in the C i t y of Bristol combin.ed ,with results fro,m computer simulation. of a RAKE receiver arch.itecture.

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