Adaptive pilot pattern for OFDM systems

O. Simeone, U. Spagnolini

Research output: Contribution to journalConference articlepeer-review

24 Scopus citations


In OFDM communication systems over fading channels, link adaptation based on the available channel state information at the transmitter (i.e., power allocation, adaptive modulation and coding rate) increases the spectral efficiency and reliability of the link. In this work, we explore the possibility to extend the set of transmission parameters to be adaptively selected to the pilot arrangement (i.e., to the collocation of pilot subcarriers on the time-frequency grid). Based on the prediction of the channel estimation error at the receiver, the transmitter can minimize the number of pilot subcarriers that guarantees a sufficiently reliable channel estimate according to Quality of Service requirements. Prediction of the channel estimation error is performed by computing the error covariance matrix of Kalman filters. The adaptive pilot arrangement problem is formulated and a "greedy" solution is proposed. Simulations show the effectiveness of the algorithm with respect to periodic re-training.

Original languageEnglish (US)
Pages (from-to)978-982
Number of pages5
JournalIEEE International Conference on Communications
StatePublished - 2004
Externally publishedYes
Event2004 IEEE International Conference on Communications - Paris, France
Duration: Jun 20 2004Jun 24 2004

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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