18-07-2013 дата публикации
Номер: US20130182754A1
A method of equalizing an OFDM signal received over a transmission channel defined by a channel matrix comprises: 5. The method of claim 4 , wherein the weighting vector Λ is computed as{'br': None, 'sub': 1', '1', '2', '2', 'Γ', 'Γ, 'Λ:=(diag(λ, . . . ,λ,λ, . . . ,λ, . . . ,λ, . . . ,λ))'}with{'sub': 'γ', 'λ being the concentration of the γth taper.'}6. The method of claim 1 , wherein all of said tapers are not zero at the same time.7. The method of claim 1 , wherein said tapers are mutually orthogonal.8. The method of claim 7 , wherein said tapers are computed from generalized eigenvectors of the generalized eigenvalue problem with the matrices{'br': None, 'i': A∘R', 'I−A∘R, 'sup': 2', '2, 'sub': l', 'l, '() and ((σ+Σσ))'}withA being the discrete Dirichlet matrix,R being the autocorrelation matrix of the channel matrix,{'sup': '2', 'σbeing the variance of the channel noise, and'}{'sub': 'l', 'σbeing the power of the lth channel tap.'}9. The method of claim 1 , wherein said least squares method is applied to an equivalent frequency domain form of said joint matrix equation.10. The method of claim 9 , wherein said equivalent frequency domain form of said joint matrix equation is solved by solving its corresponding normal equations.11. The method of claim 8 , wherein the channel matrix is modeled with a complex-exponential basis expansion model of the channel taps of the transmission channel.12. The method of claim 11 , wherein the channel matrix is modeled with a truncated Fourier series expansion model of the channel taps of the transmission channel.13. The method of claim 1 , wherein in solving the least squares problem the channel matrix is approximated by a banded matrix.14. The method of claim 13 , wherein the least squares problem containing said banded channel matrix approximation is solved by using a Cholesky factorization.15. The method of claim 1 , wherein four tapers are used. This application claims the benefit of European Patent Application No. ...
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