Power allocation strategies for SVD multicell MIMO-OFDM based systems

The aim of this paper is to propose and evaluate power allocation techniques for SVD precoded multicell multiuser MIMO-OFDM based systems. We consider a highspeed backhaul network where the base stations are transparently linked by optical fiber to a central unit. This architecture allows an efficient joint multicell multiuser processing. The considered precoder is designed in two phases: first the intercell interference is removed by applying a SVD based algorithm. Then the system is further optimized by proposing three power allocation algorithms with per-BS power constraint and different complexity tradeoffs: one optimal to minimize the average BER and two suboptimal. The performance of the proposed schemes is evaluated, considering typical pedestrian scenarios based on LTE specifications. Numerical results show that the proposed suboptimal power allocation schemes achieve a performance very close to the optimal.