OFDM: reception
Hi, QMA
As u said, it can be done by frame design or by identical cyclic ,prefix postfix Ex. in your simulation before u recieve useful data u could set known initial bit like "0101...1" then [GI,data]0101....1[GI,data] till the end of frame in meaning to track symbol by symbol or just frame by frame .
It's better if u look at WLAN's standard like IEEE 802.11a,g or WIMAX that each standard have how physical techinqe used for frame or packet design.
At last, almost matlab companion about ofdm from any text book or some link in www. assume perfect synchronize and detection.