Title :
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
fDate :
30 Aug.-2 Sept. 2004
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;
Conference_Titel :
Spread Spectrum Techniques and Applications, 2004 IEEE Eighth International Symposium on
Print_ISBN :
0-7803-8408-3
DOI :
10.1109/ISSSTA.2004.1371707
