Partitioned turbo super-orthogonal codes for a UMTS CS-CDMA scheme

Author

Souto, Nuno ; Silva, João Carlos ; Correia, Américo ; Cercas, Francisco ; Rodrigues, António

Author_Institution

Instituto de Telecomunicacoes, Portugal

fYear

2004

fDate

30 Aug.-2 Sept. 2004

Firstpage

285

Lastpage

289

Abstract

The paper studies the performance of a UMTS system using a code-spread CS-CDMA scheme with the aim of improving both uplink and downlink performances. This scheme employs low rate partitioned turbo super-orthogonal codes alone for achieving the bandwidth expansion. Additionally, a scrambling code with no spreading is used for distinguishing simultaneous users. Modifications to the current UMTS structure in order to accommodate this new scheme are also discussed. To evaluate and compare the performances of the actual DS-CDMA scheme and the proposed CS-CDMA scheme, a stand-alone simulator was built and the results are presented and discussed.

Keywords

3G mobile communication; code division multiple access; spread spectrum communication; turbo codes; DS-CDMA; UMTS; bandwidth expansion; code-spread CDMA; low rate codes; partitioned turbo super-orthogonal codes; scrambling code; turbo codes; 3G mobile communication; Bandwidth; Convolution; Convolutional codes; Decoding; Downlink; Error correction codes; Interference; Multiaccess communication; Turbo codes;

fLanguage

English

Publisher

ieee

Conference_Titel

Spread Spectrum Techniques and Applications, 2004 IEEE Eighth International Symposium on

Print_ISBN

0-7803-8408-3

Type

conf

DOI

10.1109/ISSSTA.2004.1371707

Filename

1371707