Patent ID: 6243412
Filing Date: 2001-06-05
Classification: H01Q,H04B

Abstract:
An adaptive array transmitter-receiver in the time division duplex system, comprising:receiving means for converting received signals from Q combination transmitting-receiving antennas into baseband signals, and for outputting the received baseband signals, said Q being an integer equal to or greater than 2;linear combination means for weighting each of said received baseband signals by a weighting coefficient, and for combining the resulting weighted received baseband signals to generate a combined signal;feedback filter means for convoluting a feedback complex symbol signal and a feedback filter coefficient, and for outputting the result of convolution as a feedback signal;signal decision means supplied with said combined signal and said feedback signal, for making a signal decision and outputting a decision signal, and for outputting an error signal resulting from the signal decision, said feedback complex symbol signal and a complex symbol signal for parameter estimation;parameter estimating means supplied with said received baseband signals, said complex symbol signal for parameter estimation and said error signal, for estimating said weighting coefficients and said feedback filter coefficient so that a mean-square value of said error signal becomes minimum, and for outputting the estimated coefficients;transmitted distortion means for convoluting said feedback filter coefficient and a delayed transmitted distortion signal to obtain an estimated channel distortion, for subtracting said estimated channel distortion from a transmitted signal, and for generating the result of subtraction as said transmitted distortion signal;transmitted baseband generating means for weighting delayed said transmitted distortion signal by said weighting coefficients to generate transmitted baseband signals; andtransmitting means for converting said transmitted baseband signals into RF frequency signals, and for transmitting them via said transmitting-receiving antennas corresponding thereto, respectively.