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Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. Aperiodic properties of generalized binary RudinShapiro sequences and some recent results on sequences with a quadratic phase function
 Institute of Electrical and Electronics Engineers IEEE, Switzerland Section: Accessing, transmission, networking. Proceedings : 2000 International Zurich Seminar on Broadband Communications, February 15  17, 2000, ETH Zürich, Switzerland Piscataway: IEEE Operations Center, 2000 pp.279286 
 International Zurich Seminar on Broadband Communications (IZS) <16, 2000, Zürich> 

 English 
 Conference Paper 
 Fraunhofer HHI () 
Abstract
This paper addresses the problem of designing good spreading sequences for CDMA systems that have smallvalued auto and crosscorrelation functions. In contrast to the usual minimax criteria, the l2 criteria of goodness axe used to assess correlation properties of spreading sequences. To motivate it, a direct evidence is given to demonstrate the utility of the l2 criteria in the context of CDMA performance. Following, these criteria are applied to two types of known unitmagnitude sequences: generalized binary RudinShapiro sequences, and sequences with quadratic phase function. The construction rule of the wellknown binary RudinShapiro sequences is based on a recursion formula that starts with the Kronecker sequences. It is shown that the asymptotic limits (N) of l2 criteria obtained for original RudinShapiro sequences are also valid in case of two arbitrary sequences obtained by means of the same recursion formula as long as the initial sequences are complementar y. As to the sequences with quadratic phase function, the upper and lower bounds on the inverse meritfactor are proved to decrease with the order N+1, which indicates excellent autocorrelation properties of the sequence.