Patent ID: 8280430

Claim:
A method of calibrating an antenna array in a wireless network, comprising: receiving first channel estimate information each corresponding to transmissions to at least two antennas of at least two access terminals; determining second channel estimate information each corresponding to transmissions from the at least two antennas of the at least two access terminals; and determining a calibration ratio based upon each of the first channel estimate information and each of the second channel estimate information, wherein determining the calibration ratio comprises solving the equation: g i , k , u = γ u · ⅇ - jω i ⁢ τ u · diag ⁡ ( h i , k , u ) · η + n i , k , u = γ i , k , u · Z i , k , u · η + n i , k , u where Z i,k,u is a diagonal matrix whose diagonal elements are the elements of the channel estimate information h i,k,u , γ i,u =γ u ·e −jω i τ u , and the subscripts i,k,u, are the tone, time, and user indexes, respectively.