Multicarrier communication system and channel estimation method thereof

A multicarrier communication method, comprising:

• transmitting a baseband signal set from a transmitter equipment by processing multiple original symbols respectively corresponding to multiple subcarrier channels according to a timing scheme, wherein the original symbols are suitably adjusted with positive phases, up-sampled, and then synthesized as a baseband signal set by a synthesis filter bank for transmission through a channel;
• and
• receiving the baseband signal set from the channel by using a receiver equipment according to the timing scheme, wherein the received baseband signal set is analyzed by an analysis filter bank, down-sampled, suitably adjusted with negative phases, and then processed by a detector to detect out the multiple original symbols transmitted respectively through the multiple subcarrier channels,
• wherein during a time frame of data transmission, the initial three of the original symbols for each of the subcarrier channels are three given pilot symbols to form a preamble, the three preambles of every consecutive three of the subcarrier channels form a preamble unit, all the pilot symbols of the preamble unit are expressed as a 3×3 matrix, and, when the center pilot symbol of the preamble unit is normalized to 1 or an imaginary unit represented by j, the 3×3 matrix is a base matrix given by
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• .