Title :
Design of subsets of complex spreading sequences
Author :
Dam, Hai Huyen ; Zepernick, Hans-Jürgen ; Nordholm, Sven
Author_Institution :
Australian Telecommun. Res. Inst., Perth, WA, Australia
Abstract :
The performance of a code division multiple access system depends on the correlation properties of the employed spreading code. Low cross-correlation values between spreading sequences are desired to suppress multiple access interference. An autocorrelation function with a distinct peak enables proper synchronization and suppresses intersymbol interference. These requirements, however, contradict each other and a trade-off needs to be established. In this paper, a global two dimensional optimization method is proposed to minimize cross-correlation with auto-correlation allowed to lie within a fixed region. This approach is applied to the design of subsets of complex spreading sequences.
Keywords :
code division multiple access; correlation methods; interference suppression; intersymbol interference; minimisation; sequences; spread spectrum communication; DS-CDMA; autocorrelation function; code division multiple access system; complex spreading sequences; correlation properties; cross-correlation; direct sequence code division multiple access; intersymbol interference; minimization; multiple access interference; spreading code; subsets; synchronization; two dimensional optimization method; Australia; Autocorrelation; Intersymbol interference; Multiaccess communication;
Conference_Titel :
Spread Spectrum Techniques and Applications, 2002 IEEE Seventh International Symposium on
Print_ISBN :
0-7803-7627-7
DOI :
10.1109/ISSSTA.2002.1049313
