Adaptive spatial and temporal optimal receiver using adaptive array antenna
Isamu Yoshii, Ryuji Kohno · Electronics and Communications in Japan (Part III Fundamental Electronic Science) · 2001
When high-speed transmission is carried out for multimedia mobile communication, it is indispensable to overcome the effect of intersymbol interference due to time-varying multipath propagation. As one of the remedies, the time domain optimum receiver using an adaptive array antenna has been proposed [1]. The time domain optimum receiver consists of three adaptive signal processing sections: an adaptive array antenna, a whitened matched filter, and a maximum likelihood estimator. However, discussions on their adaptive updating methods have not been sufficient. In this paper, centered around adaptive updating, the configuration of the adaptive spatial and temporal optimum receiver and the updating method are discussed. First, by means of the array antenna, the direction of arrival of the received signal is estimated. Separation of the directions of arrival is carried out by adaptive beam forming. By means of the matched filter, the delay profile for each direction of arrival is obtained. Such a configuration and an adaptive updating method are described. A method for improving the metric calculation of the propagation path estimator and trellis in the maximum likelihood sequence estimator (MLSE) by Viterbi algorithm is also presented. By computer simulation, improvement of the convergence characteristics of each adaptive controller and bit error rate is shown. © 2001 Scripta Technica, Electron Comm Jpn Pt 3, 84(5): 23–32, 2001