OFDM diversity receiver and receiving method using a plurality of equalizers

摘要

An OFDM diversity receiver has a plurality of antennas for receiving OFDM signals transmitted via multi-paths, a plurality of demodulating units which demodulate the OFDM signals received at the antennas into original signals, a plurality of equalizers which estimate a plurality of channel state information from the OFDM signals demodulated by the demodulating units and compensate distortions occurred on OFDM signal channel according to the plurality of channel state information, and an antenna adjusting unit which generates control signals in order to adjust the antennas according to the plurality of channel state information estimated by the equalizers. The antenna adjusting unit has a null detecting unit which detects nulls from the plurality of channel state information estimated by the equalizers when a channel state information is considered as a null if the channel state information is smaller than a predetermined threshold, a null counting unit which counts the number of the nulls detected at the same position among the nulls detected in the null detecting unit, and a controller which generates the control signals in order to adjust the antennas so that the number of nulls counted in the null counting unit can be minimized. The SNR of each sub-carrier of the OFDM signals combined in the combiner can be maintained high.