Title :
Optimization of orthogonal polyphase spreading sequences for wireless data applications
Author :
Wysocki, B.J. ; Wysocki, T.A.
Author_Institution :
Wollongong Univ., NSW, Australia
fDate :
6/23/1905 12:00:00 AM
Abstract :
We propose a simple but efficient method for optimizing correlation properties of polyphase spreading sequences for asynchronous DS CDMA applications. The proposed method can be used to minimize the mean square value of aperiodic crosscorrelation or the mean square value of aperiodic autocorrelation, the maximum value of aperiodic crosscorrelation functions, merit factor or other properties of the sequence set. The important feature of the method is that when applied to orthogonal sequences, it modifies correlation properties of the sequence set, while it preserves their orthogonality for perfect synchronization
Keywords :
binary sequences; code division multiple access; correlation methods; data communication; least mean squares methods; optimisation; packet radio networks; spread spectrum communication; synchronisation; aperiodic autocorrelation; aperiodic crosscorrelation; asynchronous DS CDMA; correlation properties; merit factor; minimum mean square value; optimization; orthogonal polyphase spreading sequences; perfect synchronization; wireless data applications; Australia; Autocorrelation; Bandwidth; Base stations; Matrices; Multiaccess communication; Multiple access interference; Multiuser detection; Optimization methods; Propagation delay;
Conference_Titel :
Vehicular Technology Conference, 2001. VTC 2001 Fall. IEEE VTS 54th
Conference_Location :
Atlantic City, NJ
Print_ISBN :
0-7803-7005-8
DOI :
10.1109/VTC.2001.956530
