Title :
An adaptive scheme for simultaneous coding and spreading in direct-sequence CDMA systems
Author :
Schotten, Hans Dieter ; Elders-Boll, Harald ; Busboom, Axel
Author_Institution :
Inst. of Commun. Eng., Aachen Univ. of Technol, Germany
Abstract :
Especially in mobile communications, spread spectrum systems have been discussed extensively because of their anti-fading capability. To increase the spectrum efficiency and to support variable data rates, combined coding and spreading (CCS) schemes are applied. We investigate CCS schemes in which every user is assigned a set of M sequences. By selecting one of these sequences, log2(M) bit are transmitted per code-sequence period. The performance of these systems is analyzed and requirements on the used user-sets to achieve low interference are derived. Finally, the construction of these sequence sets and the resulting system performance is described
Keywords :
adaptive codes; code division multiple access; fading; land mobile radio; pseudonoise codes; radiofrequency interference; sequences; spread spectrum communication; adaptive scheme; code-sequence period; coding; direct-sequence CDMA systems; fading; low interference; mobile communications; sequence sets; spectrum efficiency; spread spectrum systems; spreading; system performance; variable data rates; Bit error rate; Capacity planning; Carbon capture and storage; Fading; Interference; Mobile communication; Multiaccess communication; Performance analysis; Spread spectrum communication; System performance;
Conference_Titel :
Vehicular Technology Conference, 1996. Mobile Technology for the Human Race., IEEE 46th
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-3157-5
DOI :
10.1109/VETEC.1996.501484
