Is any similarities between cdma,tdma.fdma?

FDMA:-> bandwidth is divided into channel,synchronization is not possible,guard band is required,codeword are not required.
TDMA:-> it is just the channel that is time shared.
Synchronization is required,guard time is required,code word are not required.
CDMA:->sharing of bandwidth and time,guard band is not required,synchronisation is not required.guard band and guard tine is required,codeword is required.

BY SANTOSH SINGH  CSE PREFINAL...