Title :
High-performance MC-CDMA via carrier interferometry codes
Author :
Natarajan, Balasubramaniam ; Nassar, Carl R. ; Shattil, Steve ; Michelini, Marco ; Wu, Zhiqiang
Author_Institution :
Dept. of Electr. & Comput. Eng., Colorado State Univ., Fort Collins, CO, USA
fDate :
11/1/2001 12:00:00 AM
Abstract :
This paper introduces the principles of interferometry to multicarrier code division multiple access (MC-CDMA). Specifically, we propose the use of MC-CDMA with novel carrier interferometry (CI) complex spreading codes. The CI/MC-CDMA method, applied to mobile wireless communication systems, offers enhanced performance and flexibility relative to MC-CDMA with conventional spreading codes. Specifically, assuming a frequency selective Rayleigh-fading channel, CI/MC-CDMAs performance matches that of orthogonal MC-CDMA using Hadamard-Walsh codes up to the MC-CDMA N user limit; and, CI/MC-CDMA provides the added flexibility of going beyond N users, adding up to N-1 additional users with pseudo orthogonal positioning. When compared to MC-CDMA schemes capable of supporting greater than N users, CI/MC-CDMAs performance exceeds that of MC-CDMA. Additionally, this new system is analyzed in the presence of phase jitters and frequency offsets and is shown to be robust to both cases
Keywords :
Rayleigh channels; code division multiple access; jitter; land mobile radio; multipath channels; multiuser channels; radiowave interferometry; spread spectrum communication; CI/MC-CDMA method; Hadamard-Walsh codes; MC-CDMA; carrier interferometry codes; frequency offsets; frequency selective Rayleigh-fading channel; mobile communication system; mobile wireless communication systems; multicarrier code division multiple access; orthogonal MC-CDMA; phase jitter; pseudo orthogonal positioning; spreading codes; Fading; Frequency diversity; Interference; Interferometry; Multiaccess communication; Multicarrier code division multiple access; Multipath channels; RAKE receivers; Signal resolution; Wireless communication;
Journal_Title :
Vehicular Technology, IEEE Transactions on
