Uplink Channel Estimation for Multi-user OFDM-based Systems

  • Authors:

  • Carlos Ribeiro;M. Julia Fernández-Getino Garcia;Víctor P. Gil Jiménez;Atílio Gameiro;Ana García Armada

  • Affiliations:

  • Instituto Politécnico de Leiria, Leiria, Portugal 2411-901 and Instituto de Telecomunicações, Universidade de Aveiro, Aveiro, Portugal 3810-193;University Carlos III de Madrid, Leganés, Madrid, Spain 30-28911;University Carlos III de Madrid, Leganés, Madrid, Spain 30-28911;Instituto de Telecomunicações, Universidade de Aveiro, Aveiro, Portugal 3810-193;University Carlos III de Madrid, Leganés, Madrid, Spain 30-28911

  • Venue:
  • Wireless Personal Communications: An International Journal
  • Year:
  • 2008

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Abstract

In this paper we propose a simple, yet flexible and efficient, channel estimator for the uplink in broadband orthogonal frequency division multiplexing (OFDM) systems. The processing is performed in the time-domain, by extracting the Channel's Impulse Response (CIR) for each user from a joint training signal. In this OFDM system, the pilot sequence we advocate, where all users share the same pilot sub-carriers, consists of one OFDM-symbol endowed with time-shifted properties per user, which isolates each user's CIR and is robust against multi-user interference. The feasibility of our approach is substantiated by system simulation results obtained using BRAN-A broadband mobile wireless channel model.