Spatial and temporal equalizer and equalization method

Abstract

Outputs from respective elements of an array antennaare demodulated, and the demodulated outputs are stored in storage means. The demodulated outputs are multiplied by tap coefficients of adaptive array antenna, then the multiplied outputs are combined by combining means, and the combined output is provided via a feed forward filterto an adaptive equalizer, wherein it is equalized to obtain a decision symbol. During reception of a training signal the tap coefficients of adaptive array antenna and tap coefficients of the adaptive equalizerare subjected to convergence processing by tap coefficient calculating meansso that an error signal becomes small, and then tap coefficients of the feed forward filterand the adaptive equalizerare subjected to convergence processing by tap coefficient calculating meansso that an error signal becomes small. Thereafter, the convergence processing by the meansandis repeated, during which a training signal stored in storage meansis used, results of the immediately preceding convergence processing are used as initial values, and it is decided by receiving quality estimating meanswhether the error signal has become sufficiently small relative to the received signal power.