Approaching eigenmode BLAST channel capacity using V-BLAST with rate and power feedback

Multiple antennas at the transmitter and receiver can achieve enormous capacities by transmitting on the channel´s eigenmodes when the channel realization is known at the transmitter. If the transmitter has no knowledge of the channel, a significant fraction of the eigenmode capacity can be achieved in an open-loop mode, but multi-dimensional coding is required. We show how the open-loop capacity can be achieved with conventional single-dimensional coding using optimum successive decoding (OSD) and simple per-antenna rate control. Using power allocation, the capacity can be further increased, although only slightly