MIMO frequency-selective channels with multiple frequency offsets: Estimation and detection techniques

Sajid Ahmed*, S. Lambotharan, A. Jakobsson, J. A. Chambers

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Channel gains and frequency offsets are estimated in a multiple input and multiple output (MIMO) scenario, allowing for more than one path between the transmit and the receive antennas, with each path possibly having a different frequency offset. Such a scenario may arise due to Doppler shift associated with various multipaths. Here, the general case is examined and an approximate maximum likelihood (AML) estimator is derived by exploiting the correlation property of the pilot signal. The AML estimator can be written as the sum of nTL one-dimensional maximisations, where nT is the number of transmit antennas and L is the total number of paths. The proposed estimator is validated by comparing the results with the Cramér-Rao lower bound (CRLB). Further, a minimum mean square error recursive (MMSER) equaliser is proposed for the considered scenario. Finally, the performance of the MMSER equaliser is compared with the equaliser not accounting for frequency offsets.

Original languageEnglish (US)
Pages (from-to)489-494
Number of pages6
JournalIEE Proceedings: Communications
Volume152
Issue number4
DOIs
StatePublished - Aug 1 2005

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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