Patent ID: 8873417

Claim:
A non-transitory computer readable medium with computer executable instructions stored thereon, which when accessed, cause a machine to perform operations for a method of using differential precoding feedback for correlated channels, comprising: transmitting by a mobile station (MS) as feedback an index angle for a differential discrete Fourier transform (DFT) codeword corresponding to a shift of a dominant beam represented by a base codeword, wherein the feedback corresponds to a precoding vector V(t)=Q({circumflex over (θ)}) for index angle {circumflex over (θ)}, where Q ⁡ ( θ ^ ) = [ 1 ⅇ j ⁢ ⁢ 2 ⁢ ⁢ π ⁢ ⁢ m / 32 ⅇ j ⁢ ⁢ 4 ⁢ ⁢ π ⁢ ⁢ m / 32 ⅇ j ⁢ ⁢ 6 ⁢ ⁢ π ⁢ ⁢ m / 32 ] and m=−16 cos({circumflex over (θ)}).