Design of spreading sequences using a modified bridging method

Author

Dam, Hai Huyen ; Zepernick, Hans-Jiirgen ; Nordholm, Sven ; Nordberg, Jorgen

Author_Institution

Australian Telecommun. Res. Inst., Perth, WA, Australia

Volume

1

fYear

2002

fDate

17-21 Nov. 2002

Firstpage

835

Abstract

The performance of a code division multiple access system depends on the correlation properties of the employed spreading code. An auto-correlation function with a distinct peak enables proper synchronization and suppresses intersymbol interference. Low cross-correlation values between spreading sequences are desired to suppress multiple access interference. However, these requirements contradict each other and a trade-off needs to be established. In this paper, a modified bridging method is proposed to minimize cross-correlation with auto-correlation being allowed to lie within a fixed region. This approach is applied to the design of complex spreading sequences.

Keywords

code division multiple access; codes; correlation methods; interference suppression; multiuser channels; optimisation; radiofrequency interference; sequences; spread spectrum communication; auto-correlation; auto-correlation function; code division multiple access system; correlation properties; cross-correlation minimization; intersymbol interference suppression; modified bridging method; optimization; spreading code; spreading sequences; spreading sequences design; synchronization; Base stations; Constraint optimization; Delay; Design optimization; Direct-sequence code-division multiple access; Interference suppression; Intersymbol interference; Multiaccess communication; Multiple access interference; Signal processing;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE

Print_ISBN

0-7803-7632-3

Type

conf

DOI

10.1109/GLOCOM.2002.1188195

Filename

1188195