Block-differential modulation over doubly selective wireless fading channels

Alfonso Cano, Xiaoli Ma, Georgios B. Giannakis

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Differential encoding is known to simplify receiver implementation because it by-passes channel estimation. However, over rapidly fading wireless channels, extra transceiver modules are necessary to enable differential transmission. Relying on a basis expansion model for time and frequency selective (doubly selective) channels, we derive such a generalized block-differential (BD) codec and prove thal it achieves maximum Doppler and multipath diversity gains, while affording low-complexity maximum-likelihood decoding. We further show that existing BD systems over frequency-selective or time-selective channels follow as special cases of our novel system. Simulations using the widely accepted Jakes' model corroborate our theoretical analysis.

Original languageEnglish (US)
Pages (from-to)2157-2166
Number of pages10
JournalIEEE Transactions on Communications
Issue number12
StatePublished - Dec 1 2005


  • Differential encoding
  • Diversity
  • Doppler
  • Doubly selective channels
  • Multipath

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