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 Power allocation strategies for distributed precoded multicell based systems
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/5739

title: Power allocation strategies for distributed precoded multicell based systems
authors: Silva, Adão
Holakouei, Reza
Gameiro, Atílio
keywords: Cooperative systems
Multicell precoding
Power allocation
Bit error rate
Orthogonal frequency division multiplexing (OFDM)
issue date: 31-May-2011
publisher: SpringerOpen
abstract: Multicell cooperation is a promising solution for cellular wireless systems to mitigate intercell interference, improve system fairness, and increase capacity. In this article, we propose power allocation techniques for the downlink of distributed, precoded, multicell cellular-based systems. The precoder is designed in two phases: first the intercell interference is removed by applying a set of distributed precoding vectors; then the system is further optimized through power allocation. Three centralized power allocation algorithms with per-BS power constraint and diferente complexity trade-offs are proposed: one optimal in terms of minimization of the instantaneous average bit error rate (BER), and two suboptimal. In this latter approach, the powers are computed in two phases. First, the powers are derived under total power constraint (TPC) and two criterions are considered, namely, minimization of the instantaneous average BER and minimization of the sum of inverse of signal-to-noise ratio. Then, the final powers are computed to satisfy the individual per-BS power constraint. The performance of the proposed schemes is evaluated, considering typical pedestrian scenarios based on LTE specifications. The numerical results show that the proposed suboptimal schemes achieve a performance very close to the optimal but with lower computational complexity. Moreover, the performance of the proposed per-BS precoding schemes is close to the one obtained considering TPC over a supercell.
URI: http://hdl.handle.net/10773/5739
ISSN: 1687-1499
publisher version/DOI: http://dx.doi.org/10.1186/1687-1499-2011-1
source: EURASIP Journal on Wireless Communications and Networking
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