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Träfflista för sökning "WFRF:(Alves Renato) srt2:(2014)"

Sökning: WFRF:(Alves Renato) > (2014)

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1.
  • Alves, Dimas I., et al. (författare)
  • Cooperative multiple-access scheme with antenna selection and incremental relaying
  • 2014
  • Ingår i: 2014 INTERNATIONAL TELECOMMUNICATIONS SYMPOSIUM (ITS). - São Paulo : IEEE. - 9781479937431
  • Konferensbidrag (refereegranskat)abstract
    • A cooperative multiple-access scheme for wireless communications systems with antenna selection and incremental relaying is proposed. The scheme aims to improve the system throughput while preserving good performance in terms of bit error rate. The system consists of N nodes which send their information to both the destination node and the multiple-antenna relay station. Based on the channel state information, the destination node decides whether or not relaying will be performed. When the relaying is performed, the decode-remodulate-and-forward protocol is used with the best antenna. Results reveal that the proposed scheme achieves a good tradeoff between throughput and bit error rate, which makes suitable to be considered for multi-user networks.
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2.
  • Valduga, Samuel Tumelero, et al. (författare)
  • Low-complexity codebook-based beamforming with four transmit antennas and quantized feedback channel
  • 2014
  • Ingår i: 2014 IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE (WCNC). - Istanbul : IEEE. - 9781479930838
  • Konferensbidrag (refereegranskat)abstract
    • In this paper we propose a low-complexity codebook-based beamforming with four transmit antennas and quantized feedback channel. The codebook design aggregates the effect of power allocation and phase rotation through a simple quantized transmit scheme. The codebook-based beamforming uses the feedback information in order to maximize the instantaneous signal-to-noise ratio (SNR) at the receiver. As a result, the proposed scheme presents an array gain. An SNR analysis is performed and it is used to find the optimal feedback information in the sense of maximizing the instantaneous SNR. A bit error rate (BER) analysis for a quantized feedback channel is also derived and it is used to compare to the results obtained for the proposed scheme under different levels of quantization. Simulations are performed over quasi-static flat Rayleigh fading channels for different closed-loop codebook-based schemes with four transmit antennas and unitary transmission rate. Results illustrate that the proposed scheme achieves full diversity order and outperforms other good schemes in terms of array gain.
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