Multislot estimation of fast-varying space-time communication channels

Monica Nicoli, Osvaldo Simeone, Umberto Spagnolini

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

In mobile communications, coherent detection requires the estimate of an increasing number of channel parameters due to the promising performance of systems that deploy multiple antennas. However, the estimate of space-time channels requires a number of training symbols that grows with the number of unknowns. To overcome this problem, we propose a subspace-based estimation method that exploits the different varying rates in the structure of the space-time channel for moving terminals. Since the channel has some fast-varying (faded amplitudes of the paths) and slowly varying (delays and directions of arrival) features, the multislot (MS) estimate is composed of two terms: the slowly varying spatial and temporal bases estimated from L consecutive slots and the fast-varying amplitudes estimated on a slot-by-slot basis. Performance analysis and simulations confirm the expected benefits of the multislot approach and demonstrate that for large L, the mean square error (MSE) on the channel estimate depends only on the number of fast-varying parameters.

Original languageEnglish (US)
Pages (from-to)1184-1195
Number of pages12
JournalIEEE Transactions on Signal Processing
Volume51
Issue number5
DOIs
StatePublished - May 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Electrical and Electronic Engineering

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