Orthogonal Frequency
Division Multiplexing (OFDM) is widely considered as a promising choice for
future wireless communications systems due to its high-data-rate transmission capability
with high bandwidth efficiency.
In OFDM, the
entire channel is divided into many narrow
sub channels, converting a frequency-selective channel into a
collection of flat frequency
independent channels. Moreover,
Inter Symbol Interference (ISI) is avoided by the use of Cyclic Prefix (CP). In
fact, OFDM has been adopted in digital audio
broadcasting (DAB), digital
video broadcasting (DVB), digital subscriber line (DSL), and wireless
local area network (WLAN).
At the
receiver the Channel Estimation is used to recover the
original information based upon certain estimation algorithm.
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