METHOD OF ADAPTIVE CHANNEL EQUALIZATION IN OFDM SYSTEM

摘要

The present invention relates to an adaptive channel equalization method of an orthogonal subband reception system, wherein a group Gi is set by dividing Y samples on a frequency axis and X pilots are included in a group on a time axis within a group Gi. Setting blocks BLi, j composed of samples (S1); Using the original pilot cell as a reference signal and comparing the pilot cells received through the actual channel to obtain initial channel inverse functions of each group (S2); A channel equalization step S3 for equalizing the channel inverse function calculated from the previous pilot cell to all samples in the current block to equalize the current block of each group; Channel coefficient for newly updating the coefficient of the channel inverse function to be applied to the next block by calculating an error value by comparing the pilot cells of the current block equalized through the channel inverse function with the original pilot cell of the current block of each group as a reference signal. It consists of an update step (S4), and forms a group at sample intervals, and also forms a block around a pilot cell in the group, and equalizes valid samples in the block while updating a channel inverse function using a pilot signal in the block. In addition, it is possible to equalize adaptively to sudden change of channel and to effectively remove interference between samples in a symbol.