A hybrid MC-CDMA precoding scheme employing code hopping and partial beamforming

Authors:
C. Masouros;E. Alsusa
Affiliations:
School of Electrical & Electronic Engineering, The University of Manchester;School of Electrical & Electronic Engineering, The University of Manchester
Venue:
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Year:
2009

Citing 3
Cited 0

A novel prefiltering technique for downlink transmissions in TDD MC-CDMA systems

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Spread-signature CDMA: efficient multiuser communication in the presence of fading

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Transmitter-based multiuser interference rejection for the down-link of a wireless CDMA system in a multipath environment

IEEE Journal on Selected Areas in Communications

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Abstract

This paper proposes a hybrid transmission technique based on code optimization and partial linear precoding for interference exploitation on the downlink of phase shift keying (PSK) based mulitcarrier code division multiple access (MC-CDMA) systems. The first stage of the technique is to dynamically allocate codes to the users so that the combination of instantaneous data and user crosscorrelations yield a favourable constructive to destructive multiple access interference (MAI) ratio. To further optimize the received signal to interference plus noise ratio (SINR), the second stage is to employ a dynamic, partial transmitter based pre-decorrelation scheme specifically designed for the exploitation of constructive MAI. The decorrelation processing is targeted to the destructive interferers, while users that interfere constructively are let correlated. This results in a significant SINR enhancement without the need for additional power-per-user investment. Mathematical analysis and simulations show that significant bit error rate (BER) performance benefits can be achieved with this technique.