Channel and timing estimation in MIMO systems

Wireless communication systems using multiple antennas, usually referred to as multiple-input multiple-output (MIMO) systems, have drawn considerable attention, because MIMO systems promise higher capacity than single-antenna systems over fading channels. Different space-time coding techniques have been proposed to practically achieve the capacity advantages of MIMO systems. To be able to achieve the coding advantage, it is required, for many space-time coding schemes, to obtain accurate channel information at the receiver. This information include the channel fading coefficients, symbol timing, and etc. In practice, it is common that the unknown channel parameters are estimated by sending known training symbols to the receiver. This training-based channel estimation approach at the receiver is suitable for quasi-static or slowly-varying fading channels. In this research, we address the estimation problems of the required channel parameters. In addition, optimal training signals are derived under various channel conditions to provide the best estimation performance.

Sponsors: NSF and ONR

Publications

  1. Y. Liu, T. F. Wong, and W. W. Hager, "Training signal design for estimation of correlated MIMO channels with colored interference," IEEE Transactions on Signal Processing, Sep. 2005. Submitted for publication.
  2. W. W. Hager, Y. Liu, and T. F. Wong, "Optimization of generalized mean square error in signal processing and communication," Linear Algebra and Its Applications, 2005. Accepted for publication.
  3. Y. Liu, T. F. Wong, and A. Pandharipande, "Timing Estimation in Multiple-Antenna Systems over Rayleigh Flat-Fading Channels," IEEE Transactions on Signal Processing, vol. 53, no. 6, pp. 2074-2088, June 2005.
  4. T. F. Wong and B. Park, "Training sequence optimization in MIMO systems with colored interference," IEEE Transactions on Communications, vol. 52, no. 11, pp. 1939-1947, Nov. 2004.
  5. B. Park and T. F. Wong, "Optimal Training Sequence in MIMO Systems with Multiple Interference Sources," in Proceedings of the IEEE Global Telecommunications Conference (GLOBECOM '04), vol. 1, pp. 86-90, Dallas, TX, Nov. 2004.
  6. Y. Liu, T. F. Wong, and A. Pandharipande, "Timing Estimation in Multiple-Antenna Systems over Rayleigh Flat-Fading Channels," Asilomar Conference, vol. 1, pp. 253-257, Nov. 2003.
  7. B. Park and T. F. Wong, "Training Sequence Optimization in MIMO Systems with Colored Noise," in Proceedings of the IEEE Military Communications Conference (MILCOM '03), vol. 1, pp. 135-140, Boston, MA, Oct. 2003.

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Last modified: 11/9/05