Patent ID: 7720183
Filing Date: 2010-05-18
Classification: H04L

Abstract:
1. An inter-carrier interference (ICI) reconstruction device for providing an estimated ICI, the ICI reconstruction and cancellation device comprising: a channel estimator configured to provide an averaged channel response during one OFDM symbol for received signals Z(k); a delay unit configured to delay the averaged channel response to provide a delayed averaged channel response; a subtracting unit configured to subtract the delayed averaged channel response from the averaged channel response to provide a channel variation term during one OFDM symbol; a first cyclic shifter configured to cyclically shift the channel variation term to provide a cyclic shifted channel variation term; a one-tap equalizer configured to equalize the received signals Z(k) to provide an equalized signal; a symbol de-mapping unit configured to de-map the equalized signal to provide a de-mapped signal; a symbol mapping unit configured to provide a mapped symbol based on the de-mapped signal; a second cyclic shifter configured to cyclically shift the mapped symbol to provide a cyclic shifted mapped symbol; a multiplier configured to provide an ICI term including being configured to multiply the cyclic shifted channel variation term and the cyclic shifted mapped symbol with an ICI attenuation coefficient due to signals received from a surrounding i-th sub-carrier, i being an integer, wherein the ICI attenuation coefficient is related with a length of inter-symbol interference-free (ISI-free) region; and a summing unit configured to sum ICI terms provided by the multiplier to provide an estimated ICI ICI(k), wherein each of the ICI terms corresponds to a different value of i.