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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Computationally Efficient Lattice Reduction Aided Detection for MIMO-OFDM Systems under Correlated Fading Channels

  • Liu, Wei (Department of Electrical Engineering and Computer Science, Oregon State University) ;
  • Choi, Kwonhue (Department of Information and Communication Engineering, Yeungnam University) ;
  • Liu, Huaping (Department of Electrical Engineering and Computer Science, Oregon State University)
  • Received : 2011.11.13
  • Accepted : 2012.01.12
  • Published : 2012.08.30
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Abstract

We analyze the relationship between channel coherence bandwidth and two complexity-reduced lattice reduction aided detection (LRAD) algorithms for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems in correlated fading channels. In both the adaptive LR algorithm and the fixed interval LR algorithm, we exploit the inherent feature of unimodular transformation matrix P that remains the same for the adjacent highly correlated subcarriers. Complexity simulations demonstrate that the adaptive LR algorithm could eliminate up to approximately 90 percent of the multiplications and 95 percent of the divisions of the brute-force LR algorithm with large coherence bandwidth. The results also show that the adaptive algorithm with both optimum and globally suboptimum initial interval settings could significantly reduce the LR complexity, compared with the brute-force LR and fixed interval LR algorithms, while maintaining the system performance.

Keywords

References

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