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1.
  • Edfors, Ove, et al. (author)
  • OFDM channel estimation by singular value decomposition
  • 1996
  • In: Mobile technology for the human race. - Piscataway, NJ : IEEE Communications Society. - 0780331575 ; , s. 923-927
  • Conference paper (peer-reviewed)abstract
    • A new approach to low-complexity channel estimation in orthogonal-frequency division multiplexing (OFDM) systems is proposed. A low-rank approximation is applied to a linear minimum mean-squared error (LMMSE) estimator that uses the frequency correlation of the channel. By using the singular-value decomposition (SVD) an optimal low-rank estimator is derived, where performance is essentially preserved - even for low computational complexities. A fixed estimator, with nominal values for channel correlation and signal-to-noise ratio (SNR), is analysed. Analytical mean-squared error (MSE) and symbol-error rates (SER) are presented for a 16-QAM OFDM system.
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2.
  • Liu, George Y., et al. (author)
  • Performance evaluation of a mobile-floating agent scheme for wireless mobile computing and communications
  • 1996
  • In: Proceedings of Vehicular Technology Conference (VTC). - : IEEE. - 0780331575 ; , s. 956-962
  • Conference paper (peer-reviewed)abstract
    • This paper examines the feasibility and performance benefits of the introduction of the mobile-floating agent scheme in a mobile system. The principal contribution of this paper is to innovatively apply virtual memory concepts to mobile systems by deploying mobile-floating agents who de-couple services and resources from the underlying network and allow them to move around following their mobile users. The concept of mobile-floating agent with the notion of service mobility, service pre-assignment and resource pre-arrangement is evaluated. Detailed analysis and evaluation of these scheme in terms of latency reduction and increased system overhead versus mobility density with three different assignment algorithms are given. The performance results clearly indicate the feasibility and the performance gain of the proposed mobile-floating agent scheme.
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