Simple smart-antenna system for mud-enabled cellular networks

Abstract

A “smart antenna” method and system for use in cellular networks where the wireless transmit receive unit and/or the base station utilize multi-user detection (MUD). The interference to and from other users is taken into consideration to maximize the desired signal while eliminating or reducing interfering signals, thereby increasing overall system capacity.

1 . A base station transmitter in a wireless communication network, wherein the base station utilizes multi-user detection for communication, comprising: 
 a plurality of i parallel data signal inputs for transmission, where the each of the i data signal inputs correspond respectively with one of i multi-users;    a plurality of j antennas;    a plurality of weight generators for producing complex weight values indexed according to the number j of antennas and each data signal i;    at least one linear processor coupled with the plurality of i parallel data signal inputs for processing the complex weight values based on channel impulse response values in a manner that de-emphasizes signal contribution to parts of the cell where the multi-users are not physically located while maximizing power gain to the i multi-users; and    a vector adder for adding output of the linear processor to form data for transmission at the plurality of j antennas.    
     
     
         2 . The transmitter of  claim 1  wherein the j antennas form a smart antenna that produces beamforming responsive to the channel impulse response data.  
     
     
         3 . The transmitter of  claim 1  wherein j=3.  
     
     
         4 . A base station receiver in a wireless communication network that utilizes multi-user detection, comprising: 
 a plurality of j antennas for receiving inputs of i channel impulse response data signals;    a plurality of weight generators for producing complex weight values indexed according to the number j of antennas and each of the i data signals;    at least one linear processor coupled with the plurality of j antennas for processing the complex weight values based on channel impulse response values in a manner that de-emphasizes signal contribution from unintended sources while maximizing power gain from a desired source; and    a multi-user detection processor for combining the signals processed by the weight values from the j antennas to reproduce the i data signals.    
     
     
         5 . The receiver of  claim 4  wherein the j antennas form a smart antenna that produces smart antenna reception of the channel impulse response data.  
     
     
         6 . The receiver of  claim 4  wherein j=3.