Introducing novel FDD and FDM in MC-CDMA to enhance performance

This paper presents a method of efficiently incorporating frequency division duplex (FDD) and frequency division multiplexing (FDM) into MC-CDMA systems to exploit frequency diversity and reduce multiple access interference (MAI). The approach used in the novel FDD/MC-CDMA is to break the total available bandwidth into subbands and interleave the subbands used for the downlink and uplink. It is shown that this technique significantly improves the performance relative to an MC-CDMA system employing a traditional FDD scheme where the spectrum is divided into a single uplink block and a single downlink block. Furthermore, FDM is introduced in the novel FDD scheme to reduce MAI in MC-CDMA (without any loss in the capacity of the overall system).

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

[2]  L. B. Milstein,et al.  Spread spectrum for mobile communications , 1991 .

[3]  K. Fazel,et al.  A flexible spread-spectrum multi-carrier multiple-access system for multi-media applications , 1997, Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97.

[4]  Masao Nakagawa,et al.  Performance of orthogonal multicarrier CDMA in a multipath fading channel , 1994, IEEE Trans. Commun..

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

[6]  J.A.C. Bingham,et al.  Multicarrier modulation for data transmission: an idea whose time has come , 1990, IEEE Communications Magazine.

[7]  Ramjee Prasad,et al.  An overview of multi-carrier CDMA , 1996, Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications.

[8]  Jean-Paul M. G. Linnartz,et al.  Multi-Carrier Cdma In Indoor Wireless Radio Networks , 1994 .

[9]  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.

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