S Lu

Publications (2)1.36 Total impact

• Source

  Available from: nus.edu.sg

  Article: Compensation for signal correlation in multiple-input multiple-output transmitting antenna arrays

  H.T. Hui, S. Lu, M. Bialkowski
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  ABSTRACT: A method is implemented to compensate for signal correlation in transmitting antenna arrays of multiple-input multiple-output (MIMO) wireless communication systems. Based on the knowledge of the transmitting channel covariance matrix, a de-correlation transform is designed to remove spatial correlation and antenna mutual coupling in the transmitting antennas. Simulation results show that if there is no correlation in the receiving antennas, this method can be used to realise capacities equivalent to those under the independent and identically distributed (i.i.d.) channel conditions. Results reveal that when there is correlation in the receiving antennas, compensation is more effective when the numbers of elements in the transmitting and receiving arrays are large. For transmitting and receiving arrays with a fixed number of elements, compensation is more effective when the antenna separation is small.
  IET Microwaves Antennas & Propagation 04/2010; · 0.68 Impact Factor
• Article: Performance analysis of multiple-input multiple-output orthogonal frequency division multiplexing systems under the influence of antenna mutual coupling effect

  S. Lu, H.T. Hui, M. Bialkowski
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  ABSTRACT: The effect of antenna mutual coupling on signal correlation and bit error rate (BER) of a multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) system has been modelled. A MIMO-OFDM model with correlated channels is presented. The correlation matrices are determined with the antenna mutual coupling taken into account. The effect of antenna mutual coupling is characterised using the receiving and transmitting mutual impedances. A rigorous expression for the BER of the system employing quadrature phase-shift keying digital modulation is derived. A 2times2 MIMO-OFDM system using the Alamouti space-time block code for OFDM symbol transmission over 64 sub-channels spanning a 20 MHz band centred at 5.2 GHz is simulated. The simulated results show that the antenna mutual coupling has a significant effect on the BER performance, especially when the spacing between the antenna elements is small.
  IET Microwaves Antennas & Propagation 04/2009; · 0.68 Impact Factor