Title :
Coded BER minimization for MIMO multicarrier systems with imperfect channel estimates
Author :
Rey, Francesc ; Lamarca, Meritxell ; Vazquez, Gregori
Author_Institution :
Dept. of Signal Theor. & Commun., Tech. Univ. of Catalonia, Barcelona, Spain
Abstract :
Linear transmitter designs that minimize the MSE or the uncoded BER do not guarantee good bit error performance when any channel correction code is introduced. As an alternative, the cutoff rate, that has been considered for a long time as the practical bound on the performance that could be achieved by finite length channel codes, can provide a good performance not for an specific channel code but for the average over the ensemble of codes with block length N. This work presents a robust power allocation strategy that maximizes the cut-off rate using partial channel state information (CSI) at the transmitter. A Bayesian formulation is used to design an optimal transmitter when CSI is noisy. A closed-form solution for the transmitter design is obtained. In addition, the design adapts to the CSI quality, providing an algorithm that tends to the open-loop design when no CSI is available at the transmitter (i.e., the same power is allocated across all antennas and subcarriers).
Keywords :
Bayes methods; MIMO systems; Rayleigh channels; block codes; channel allocation; channel capacity; channel coding; channel estimation; error statistics; mean square error methods; minimisation; Bayesian formulation; CSI; MIMO multicarrier system; MSE; block length; channel correction code; channel state information; imperfect channel estimate; linear transmitter design; maximization; mean square error; multiple input multiple output; open-loop design; optimal transmitter; power allocation strategy; uncoded BER; Adaptive arrays; Algorithm design and analysis; Bayesian methods; Bit error rate; Channel state information; Closed-form solution; Error correction codes; MIMO; Robustness; Transmitters;
Conference_Titel :
Signal Processing Advances in Wireless Communications, 2004 IEEE 5th Workshop on
Print_ISBN :
0-7803-8337-0
DOI :
10.1109/SPAWC.2004.1439240