Semi-blind transmit antenna array device using feedback information and method thereof in a mobile communication system

Abstract

There is provided a transmit antenna array device with at least two antennas and a method thereof in which a transmission beam is appropriately formed based on a weight vector to be transmitted to a specific mobile station in a mobile communication system. For this purpose, a base station device has a reverse processor for processing a reverse signal received through the antenna array, a forward fading information extraction unit for extracting forward fading information from the received reverse signal, a beam formation controller for generating a weight vector for formation of a transmission beam using the forward fading information and the received reverse signal, and a forward processor having a transmission beam generator for generating a transmission beam for a transmission message based on the weight vector. A mobile station device has a forward processor for processing a received forward signal, a forward fading estimator for estimating forward fading information of the forward signal for each path, a forwarding fading encoder for combining the estimated forward fading information and encoding the combined forward fading information, and a reverse processor for multiplexing the encoded forward fading information with a transmission message and feeding back the forward fading information in the multiplexed signal to a base station.

1 . A mobile station device in a mobile communication system, comprising: 
 a forward processor for processing a received forward signal;    a forward fading estimator for estimating forward fading information of the forward signal for each path;    a forwarding fading encoder for combining the estimated forward fading information and encoding the combined forward fading information; and    a reverse processor for multiplexing the encoded forward fading information with a transmission message and feeding back the forward fading information in the multiplexed signal to a base station,    wherein if the forward signal forms an omnidirectional beam, the forward fading estimator estimates complex forward fading information {β i   F , i=1, 2, . . . , M}.    
   
   
       2 . The mobile station device of  claim 1 , wherein if the forward signal forms an omnidirectional beam, the forward fading estimator estimates forward fading severity information {|β i   F |, i=1, 2, . . . , M}.  
   
   
       3 . The mobile station device of  claim 1 , wherein the forward fading estimator estimates complex forward fading information {β i   F   a (θ i ) H   w |, i=1, 2, . . . , M } from the forward signal.  
   
   
       4 . The mobile station device of  claim 1 , wherein the forward fading estimator estimates forward fading severity information {|β i   F   a (θ i ) H   w , i=1, 2, . . . , M} from the forward signal.  
   
   
       5 . The mobile station device of  claim 1 , wherein the reverse processor inserts the forward fading information into a predetermined reverse channel message, for transmission.  
   
   
       6 . The mobile station device of  claim 1 , wherein the reverse processor transmits the forward fading information on a separately designated reverse channel.