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Sociedade Brasileira de Telecomunicações

Esquema MIMO Beamforming Otimizado para Canal de Retorno de Baixa Taxa de Transmissão

In this paper, we propose a multiple-input multiple- output (MIMO) communication scheme, optimized for feedback channel with low data rate. It is used a pre-processing based on the quantized information of phases and angles received a priori from the feedback channels. A full diversity bit error rate (BER) performance is obtained by the proposed scheme with a small penalty in terms of signal-to-noise ratio (SNR) gain when compared to other schemes that need more feedback bits to work properly. The expression of a BER lower bound for the proposed scheme is derived and used for comparison with the Monte Carlo simulation results. Also, the proposed scheme and the low-complexity Beamforming-based MIMO scheme (EBCB - [1]) are compared in terms of BER versus SNR. Results show that the proposed scheme achieves full spatial diversity order and has a good SNR performance, despite the low feedback rate required.

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