Cyclic Delay Diversity (CDD) is a
diversity scheme used in
OFDM-based telecommunication systems, transforming spatial diversity into frequency diversity and thus avoiding
intersymbol interference.
CDD was introduced in 2001 and can gain frequency diversity at the receiver without changing the
SISO receiver structure.
The idea of CDD for OFDM had previously also been submitted as a patent application in September 2000.
P. Larsson, US-6842487 B1, WO/2002/025857, "Cyclic Delay Diversity for Mitigating ISI in OFDM systems", filed 22 September 2000
First filed patent applicationArchived 2016-03-07 at the
Wayback Machine, PCT Biblio. data from
WIPO.