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Träfflista för sökning "WFRF:(Boucheret Marie Laure) srt2:(1998)"

Sökning: WFRF:(Boucheret Marie Laure) > (1998)

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1.
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2.
  • van de Beek, Jan-Jaap, et al. (författare)
  • Three non-pilot-based time and frequency estimators for OFDM
  • 1998
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • Time-domain Maximum-Likelihood (ML) estimators of time and frequency o¤sets are derived for three Orthogonal Frequency Division Multiplexing (OFDM) signal models: a pulse-shaped one-shot OFDM signal, a stream of multiple OFDM signals and an OFDM signal in a dispersive channel environment. We then develop structures to simplify their implementation. Simulation results show the relative performance and strengths of each of these three estimators.
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3.
  • van de Beek, Jaap, et al. (författare)
  • Synchronization of a TDMA-OFDM frequency hopping system
  • 1998
  • Ingår i: Pathway to a global wireless revolution. - Piscataway, NJ : IEEE Communications Society. - 0780343204 ; , s. 1290-1294
  • Konferensbidrag (refereegranskat)abstract
    • In this paper we present a Time Division Multiple Access-Orthogonal Frequency Division Multiplexing (TDMA-OFDM)-based radio interface proposal for the Universal Mobile Telecommunication System (UMTS). We focus on synchronization and present an implementable algorithm for the tracking of the mobiles' time and frequency offsets at the base station in the uplink. This algorithm is based on recently developed estimation methods that use redundancy introduced by the cyclic prefix. A modified Maximum Likelihood (ML) estimator for the Additive White Gaussian Noise (AWGN) channel is used to meet both implementational requirements and performance requirements for frequency-selective fading multiuser environments. Simulation results for a typical UMTS mobile channel environment show that the uncoded symbol error rate of a coherently modulated system using our synchronization scheme is virtually indistinguishable from that of a system with no time and frequency offset.
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  • Resultat 1-3 av 3

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