Joint optimization of rate allocation and BLAST ordering to minimize outage probability

A. Kannan, B. Varadarajan, J.R. Barry
IEEE Wireless Communications and Networking Conference, 2005  
We consider a wireless communication system over a multiple-input multiple-output Rayleigh-fading channel with successive-cancellation detection. The outage probability of such a system is strongly dependent on two choices: the order in which the layers are detected, and the rate-allocation strategy at the transmitter. We propose the rate-normalized ordering algorithm, a generalization of the BLAST ordering algorithm that is shown to minimize outage probability. We further optimize the
more » ... n of rate and energy at the transmitter, for a variety of receiver ordering strategies. Finally, we jointly optimize the receiver ordering and transmitter rate and energy allocations. Our main conclusion is that, for a wide range of data rates and SNR, the outage probability is minimized by a combination of rate-normalized ordering and a partially uniform rate and energy (PURE) allocation strategy. The jointly optimum system outperforms the Bell Labs layered space-time (BLAST) architecture by 15 dB at 8 b/s/Hz and an outage probability of 10 −3 , when operating over a 4-input 4-output Rayleigh-fading channel. Also, the jointly optimum system shows an improvement of 1.5 dB over a recently proposed combination of optimum allocation and fixed ordering.
doi:10.1109/wcnc.2005.1424560 dblp:conf/wcnc/KannanVB05 fatcat:hmaymfjv7bd3vkbn442agocude