Patent ID: 7634030

Claim:
A receiving apparatus for a direct sequence (DS)/code division multiple access (CDMA) system equipped with a multiple-input multiple-output (MIMO) antenna system, comprising: a plurality of receiving antennas for receiving a signal transmitted from a transmitter; input signal generating means for gathering transmitted data in the received signal and outputting the gathered transmitted data; adaptive filtering means for filtering a complex received signal according to a tap weight which is controlled in a predetermined cycle, and outputting filtered data; channel estimating means for estimating a phase and an amplitude of a channel between one of a plurality of transmitting antennas and one of a plurality of receiving antennas based on the filtered data, and outputting an estimation data as a result of estimation; signal recovering means for recovering an original signal from the received signal by combining the estimation data and filtered data with all components of multipath; selecting means for selecting one of the original signal and a training data signal supplied by the receiver and outputting a selected signal; reference signal generating means for generating a reference signal based on the selected signal and the estimation data; error calculating means for calculating error between the filtered data and the reference signal by subtracting the filtered data from the reference signal multiplied by the estimation data; and tap weight controlling means for controlling the tap weight of the adaptive filtering unit based on a constraint minimum mean square error (MMSE) criterion having at least one condition.