Block differential modulation for doubly-selective wireless fading channels

Alfonso Cano, Xiaoli Ma, Georgios B Giannakis

Research output: Contribution to journalConference articlepeer-review


Differential encoding is known to simplify receiver complexity 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 that achieves the maximum Doppler and multi-path diversity gains, while affording low-complexity maximum likelihood (ML) decoding. We further show that existing BD systems over frequency-selective or time-selective channels follow as special cases of our novel system. Simulations corroborate our theoretical analysis.

Original languageEnglish (US)
Article numberSP02-3
Pages (from-to)1922-1926
Number of pages5
JournalIEEE International Conference on Communications
StatePublished - Sep 12 2005
Event2005 IEEE International Conference on Communications, ICC 2005 - Seoul, Korea, Republic of
Duration: May 16 2005May 20 2005


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