Scalable interpolation-based QRD architecture for subcarrier-grouped-ordering MIMO-OFDM system

  • Authors:

  • Po-Lin Chiu;Lin-Zheng Huang;Yuan-Hao Huang

  • Affiliations:

  • Department of Communication Engineering, National Chiao-Tung University, Industrial Technology Research Institute, Hsinchu, Taiwan;Institute of Communications Engineering and Department of Electrical Engineering, National Tsing-Hua University, Hsinchu, Taiwan;Institute of Communications Engineering and Department of Electrical Engineering, National Tsing-Hua University, Hsinchu, Taiwan

  • Venue:
  • Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
  • Year:
  • 2009

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Abstract

In the MIMO-OFDM system, QR-based MIMO detection suffers from high computational complexity of the QR decomposition due to the large numbers of antennas and subcarriers. Thus, interpolation-based QR decomposition was proposed to reduce the complexity. In this paper, we present a scalable interpolation-based QR decomposition algorithm for the grouped-ordering interpolation scheme. The proposed algorithm possesses computational stability because it eliminates the square root and division operations in the traditional Gram-Schmidt-based scheme. Besides, its scalability offers a power-saving structure for the lower-rank MIMO scheme in the future mobile communication systems. A hardware architecture is also developed to balance the hardware complexity and computation time. Finally, analysis result shows that the proposed algorithm reduces the complexity to 25.4%-61.3% of the traditional algorithm in the 4 × 4 MIMO-OFDM system.