Title :
Large set of CI spreading codes for high-capacity MC-CDMA
Author :
Natarajan, Balasubramaniam ; Wu, Zhiqiang ; Nassar, Carl R. ; Shattil, Steve
Author_Institution :
Dept. of Electr. & Comput. Eng., Kansas State Univ., Manhattan, KS, USA
Abstract :
In this letter, a large set of spreading codes that doubles capacity in multicarrier code-division multiple-access (MC-CDMA) systems without any cost in bandwidth and with negligible cost in performance is introduced. This large set is comprised of: 1) complex spreading codes instead of conventional real-valued spreading codes and 2) two sets, each made up of orthogonal complex spreading codes, with minimum cross correlation between sets. Simulations performed over Rayleigh fading channels demonstrate 100% gains in terms of MC-CDMA capacity with negligible loss in performance.
Keywords :
Rayleigh channels; code division multiple access; codes; CI spreading codes; Rayleigh fading channel; carrier interferometry; high-capacity MC-CDMA; multicarrier code-division multiple-access system; orthogonal complex spreading codes; Bandwidth; Bit error rate; Costs; Degradation; Fading; Interferometry; Multiaccess communication; Multicarrier code division multiple access; Performance gain; Performance loss; 65; CI; Carrier interferometry; MC-CDMA; complex spreading sequences; multicarrier code-division multiple access; pseudo-orthogonality;
Journal_Title :
Communications, IEEE Transactions on
DOI :
10.1109/TCOMM.2004.836564
