Apparatus for antenna diversity using joint maximal ratio combining

Abstract

A method for improving performance of radio frequency (RF) communication of a station (STA) having an access point (AP) is disclosed. The method includes using an arbitrary set of transmit antenna weights, calculating a set of receive antenna weights, and updating the transmit antenna weights based on the receive antenna weights.

1 . A method for improving performance of radio frequency (RF) communication of a station (STA) having an access point (AP), the method comprising:
 transmitting a transmit antenna weight vector using a complex transmit antenna weight vector for each of a plurality of N antennas, wherein each complex transmit antenna weight has a magnitude and a phase whose values may vary with frequency;   calculating a receive antenna weight vector comprising a plurality of complex receive antenna weights for the N plurality of antennas; and   updating the transmit antenna weight vector for the plurality of N antennas based on a computed conjugate of the received antenna weight vector and a norm of the receive antenna weight vector.   
   
   
       2 . The method as in  claim 1 , wherein the transmit weight vector and the receive antenna weight vector converge to values that optimize the signal-to noise-ratio (SNR) of the STA. 
   
   
       3 . The method as in  claim 1 , wherein the receive antenna weights are computed from a matrix multiplication of an arbitrary set of transmit antenna weights and a channel response matrix. 
   
   
       4 . The method as in  claim 2 , further comprising storing in a memory the optimized SNR value. 
   
   
       5 . The method as in  claim 4 , wherein the optimized SNR value is stored in a look-up-table.