Bit loading for MIMO with statistical channel information at the transmitter and ZF receivers

Comunicació presentada en la International Conference on Communications (ICC '09), celebrada els dies 14, 15, 16, 17 i 18 de juny de 2009 a Dresden (Alemanya), organitzat per l’Institute of Electrical and Electronics Engineers (IEEE).For single-user MIMO communication with uncoded and coded QAM signals, we propose bit and power loading schemes that rely only on channel distribution information at the transmitter. To that end, we develop the relationship between the average bit error probability at the output of a ZF linear receiver and the bit rates and powers allocated at the transmitter. This relationship, and the fact that a ZF receiver decouples the MIMO parallel channels, allow leveraging bit loading algorithms already existing in the literature. We solve dual bit rate maximization and power minimization problems and present performance results/nthat illustrate the gains of the proposed scheme with respect to/na non-optimized transmission.This work has been partly funded by projects MULTI-ADAPTIVE/n(TEC2008-06327-C03-02) and COMONSENS (CSD2008-00010)