High-performance, high-capacity MC-CDMA via carrier interferometry

This paper proposes a novel scheme which doubles capacity in MC-CDMA systems without any cost in bandwidth and with negligible cost in performance. Specifically: (1) complex spreading codes are used instead of conventional real value spreading codes; and (2) two groups of orthogonal complex spreading codes are used simultaneously, where minimum cross-correlation exists between the two groups. Simulations performed over Rayleigh fading channels using these novel codes demonstrate that the proposed scheme enables gain of 100% in terms of MC-CDMA capacity with negligible performance losses.

[1]  A. Viterbi.  CDMA: Principles of Spread Spectrum Communication , 1995 .

[2]  Balasubramaniam Natarajan,et al.  Generation of correlated Rayleigh fading envelopes for spread spectrum applications , 2000, IEEE Communications Letters.

[3]  Carl R. Nassar,et al.  Introduction of carrier interference to spread spectrum multiple access , 1999, 1999 IEEE Emerging Technologies Symposium. Wireless Communications and Systems (IEEE Cat. No.99EX297).

[4]  L. B. Milstein,et al.  Performance of multicarrier DS CDMA systems in the presence of correlated fading , 1997, 1997 IEEE 47th Vehicular Technology Conference. Technology in Motion.

[5]  Ramjee Prasad,et al.  Overview of multicarrier CDMA , 1997, IEEE Commun. Mag..

[6]  Theodore S. Rappaport,et al.  Wireless communications - principles and practice , 1996 .

[7]  John G. Proakis,et al.  Digital Communications , 1983 .