Patent ID: 8798178

Claim:
A channel estimation method in an orthogonal frequency division multiplexing system, comprising steps of: A. grouping physical resource blocks in a bandwidth of the orthogonal frequency division multiplexing system; B. extracting at least one group from groups for channel estimation to acquire a channel coefficient, wherein the number of extracted groups is less than the total number of groups; C. completing multiple input multiple output (MIMO) demodulation by using the acquired channel coefficient; and D. judging whether the channel estimation on grouping has been completed, and if yes, ending, otherwise, returning to step B; wherein the channel estimation further comprises steps of: estimating the channel coefficient at a reference signal; carrying out a first time domain interpolation, changing the reference signal density at an orthogonal frequency division multiplexing (OFDM) symbol containing the reference signal to ⅓ of the reference signal density, and calculating the channel coefficient of a resource element at the OFDM symbol containing the reference signal; carrying out 3 times upsampling frequency domain interpolation on the OFDM symbol containing the reference signal and acquiring the channel coefficient at the OFDM symbol containing the reference signal; and carrying out a second time domain interpolation, calculating the channel coefficient at an OFDM symbol that doesn't contain the reference signal by using the channel coefficient at the OFDM symbol containing the reference signal, so as to acquire the channel coefficients at all the OFDM symbols.