Energy Efficiencies for V-BLAST-modified OSIC-based Cooperative MIMO Scheme

Abstract For energy-constrained distributed wireless sensor networks (WSNs), good bit-error-rate (BER) performance of VBLAST detection in long-haul communication for cooperative multiple input multiple output(CMIMO) can significantly cut down the overall power consumption. In this paper, we propose a modified layered OSIC scheme to use parallel interference cancellation to replace part of successive interference cancellation, meanwhile we employ post-cancellation and pre-cancellation to refine the coarse results. Detailed steps are described as follows, firstly, according to the complexity formulas we choose the optimal number of transmit layers to be detected by the modified layered OSIC scheme and the remaining transmit layers then be detected by ML scheme to give better BER performance. Simulation and analysis indicate that via using the proposed OSIC method, a certain number of pseudo inverse operations are saved while improving a better BER performance. We still adopt the proposed OSIC method in the long-haul communication for WSNs, based on this new method, the modulation size are selected with respect to achieving the lowest energy consumption. Numerical results show that significant energy savings can be received by the proposed OSIC method for distributed WSNs.