Hopping pilots for estimation of frequency-offset and multiantenna channels in MIMO-OFDM

Xiaoli Ma, Mi Kyung Oh, Georgios B. Giannakis, Dong Jo Park

Research output: Contribution to journalArticlepeer-review

80 Scopus citations


We design pilot-symbol-assisted modulation for carrier frequency offset (CFO) and channel estimation in orthogonal frequency-division multiplexing transmissions over multi-input multi-output frequency-selective fading channels. The CFO and channel-estimation tasks rely on null-subcarrier and nonzero pilot symbols that we insert and hop from block to block. Because we separate CFO and channel estimation from symbol detection, the novel training patterns lead to further decoupled CFO and channel estimators. The performance of our algorithms is investigated analytically, and then compared with an existing approach by simulations.

Original languageEnglish (US)
Pages (from-to)162-172
Number of pages11
JournalIEEE Transactions on Communications
Issue number1
StatePublished - Jan 1 2005


  • Carrier frequency offset (CFO)
  • Cramér-Rao lower bound
  • Frequency-selective channel
  • Multi-input multi-output (MIMO),Orthogonal frequency-division multiplexing (OFDM)
  • Null subcarriers
  • Pilot symbols

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