A hybrid MC-CDMA precoding scheme employing code hopping and partial beamforming.
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 (MCCDMA) 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. ©2009 IEEE.
|Title:||A hybrid MC-CDMA precoding scheme employing code hopping and partial beamforming|
|UCL classification:||UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Engineering Science
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