Title :
Optimization of linear pre-decoders for multi-user closed-loop MIMO-OFDM
Author :
Duplicy, Jonathan ; Louveaux, Jérôme ; Vandendorpe, Luc
Author_Institution :
Commun. & Remote Sensing Lab., Univ. Catholique de Louvain, Belgium
Abstract :
This paper deals with a multi-user downlink MIMO-OFDM scheme with perfect channel knowledge at both the transmit and receive sides. The objective is to optimize the average BER while fulfilling each user´s rate and satisfying a global transmit power constraint. Space division multiple access (SDMA) is investigated and three new iterative schemes are proposed to compute the linear pre-decoders. The results exhibit, inter alia, that orthogonalizing the channels does not lead to the best results.
Keywords :
MIMO systems; OFDM modulation; closed loop systems; error statistics; iterative methods; multiuser channels; optimisation; precoding; space division multiple access; BER; SDMA; bit error rate; closed-loop system; iterative scheme; linear predecoder computation; multiple input multiple output; multiuser downlink MIMO-OFDM scheme; optimization; orthogonal frequency division multiplexing; space division multiple access; Bit error rate; Constraint optimization; Downlink; Iterative decoding; MIMO; Multiaccess communication; OFDM; Receiving antennas; Space technology; Transmitters;
Conference_Titel :
Communications, 2005. ICC 2005. 2005 IEEE International Conference on
Print_ISBN :
0-7803-8938-7
DOI :
10.1109/ICC.2005.1494694
