Patent ID: 8582517

Claim:
A method comprising: at a communication device, generating a signal for transmission that comprises a plurality of subcarriers in each of a plurality of sub-bands, by modulating the subcarriers in each of the plurality of sub-bands with the same data causing the plurality of sub-bands to be highly correlated with each other; applying different cyclic delays to the plurality of sub-bands of the signal to de-correlate the plurality of sub-bands, wherein the applying comprises applying a different phase adjustment e jθ k across the subcarriers in the respective sub-bands such that θ k = { ⁢ 2 ⁢ ⁢ π ⁢ ⁢ k ⁢ ⁢ Δ ⁢ ⁢ f ⁢ ⁢ τ 1 sub ⁢ - ⁢ band ⁢ ⁢ 1 2 ⁢ ⁢ π ⁢ ⁢ k ⁢ ⁢ Δ ⁢ ⁢ f ⁢ ⁢ τ 2 sub ⁢ - ⁢ band ⁢ ⁢ 2 , wherein Δf is the subcarrier spacing, τ 1 is the cyclic delay for a first sub-band 1 and τ 2 is the cyclic delay for a second sub-band 2 , and k is the subcarrier index; and amplifying the signal after applying the different cyclic delays for transmission from the communication device.