Method for channel estimation in orthogonal frequency division multiplexing system and device thereof

An Orthogonal Frequency Division Multiplexing (OFDM) transmitter, comprising:

• a pilot OFDM symbol distribution density determining module, used for determining a distribution density of the pilot OFDM symbol according to the maximum Doppler frequency shift supported by an OFDM system, whose input is the maximum Doppler frequency shift and output is connected to a pilot OFDM symbol and data OFDM symbol generating and transmitting module;
• and
• the pilot OFDM symbol and data OFDM symbol generating and transmitting module, used for generating the pilot OFDM symbol and the data OFDM symbol according to the distribution density of the pilot OFDM symbol determined by the pilot OFDM symbol distribution density determining module, wherein a relation between the length of data part of a pilot OFDM symbol Np,data and the length of data part of a data OFDM symbol Nd,data meets the following formula:
• N
• p
• ,
• data
• =
• 1
• 2
• n
• ·
• N
• d
• ,
• data
• ;
• wherein
• ⁢
• ⁢
• n
• =
• 0
• ,
• 1
• ⁢
• ⁢
• …
• and for transmitting the pilot OFDM symbol and the data OFDM symbols.

An Orthogonal Frequency Division Multiplexing (OFDM) receiver, comprising a channel equalization module and a data channel estimation module, wherein the data channel estimation module comprises:

• a pilot OFDM symbol time-domain channel response calculating module, used for obtaining time-domain channel response at a pilot OFDM symbol according to a received time-domain pilot OFDM symbol, and for outputting the time-domain channel response at the pilot OFDM symbol to a pilot OFDM symbol time-domain channel information calculating module;
• the pilot OFDM symbol time-domain channel information calculating module, used for calculating time-domain channel information of the pilot OFDM symbol according to the time-domain channel response at the pilot OFDM symbol, and for outputting the time-domain channel information of the pilot OFDM symbol to a data OFDM symbol frequency-domain channel information calculating module;
• and
• the data OFDM symbol frequency-domain channel information calculating module, used for calculating frequency-domain channel information of the data OFDM symbol according to the time-domain channel information of the pilot OFDM symbol, and for outputting the calculated frequency-domain channel information to the channel equalization module.