Patent ID: 6862316

Claim:
A spatial and temporal equalizer comprising: an adaptive array antenna which complex-multiplies array antenna output signals from an array antenna composed of L elements by tap coefficients of adaptive array antenna to control the amplitudes and phases of received signals, and combines the multiplied output signals into an array antenna composite signal, said L being an integer equal to or greater than 2; a feed forward filter comprising a transversal filter of N taps respectively weighted by tap coefficients of feed forward filter, for receiving said array antenna composite signal and outputting signals of the N taps as a first tap input signal and a filtering output signal, said N being an integer equal to or greater than 2; an adaptive equalizer which has a replica generator of M taps respectively weighted by tap coefficients of adaptive equalizer, outputs, as a second tap input signal, signals from the M taps of said replica generator supplied with symbol sequences, and outputs an estimation error signal for a received symbol based on the output from said adaptive equalization circuit and a decision symbol signal, said M being an integer equal to or greater than 1; first tap coefficient calculating means for calculating said tap coefficients of adaptive array antenna and said tap coefficients of adaptive equalizer from said array antenna output signal, said second tap input signal and said estimation error signal; second tap coefficient calculating means for calculating said tap coefficients of feed forward filter and said tap coefficients of adaptive equalizer from said first and second tap input signals and said estimation error signal; tap coefficient select means for selectively outputting either said tap coefficients of adaptive equalizer from said first tap coefficient calculating means or said tap coefficients of adaptive equalizer from said second tap coefficient calculating means; and receiving quality estimating means for causing said first and second tap coefficient calculating means to repeat their convergence operation until it is estimated that the receiving quality has reached a desired level.