Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
2008-07-10
2011-11-08
Corrielus, Jean B (Department: 2611)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
C375S224000, C370S203000
Reexamination Certificate
active
08054917
ABSTRACT:
A method of estimating a time variant Orthogonal Frequency Division Multiplexing (OFDM) while eliminating Inter-carrier Interference (ICI) is disclosed, where the time variant channel matrix is estimated at channel taps using a Basis Expansion Model (BEM). The BEM method decomposes the time variant channel into a group of basis functions in the frequency domain. Coefficients are estimated using a sub-space tracking algorithm that decreases the dimensions of the coefficient matrix allowing for simpler calculation of the estimated signal. The coefficients matrix is estimated using a conjugate gradient iterative method that may be stopped after 6-8 iterations to arrive at an acceptable estimation. Finally, the transmitted data is estimated, again using the conjugate gradient method iteratively, wherein the conjugate gradient method is stopped after a small number of iterations.
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Huang Feng
Li Yan
Touzni Azzédine
Advanced Micro Devices , Inc.
Corrielus Jean B
Volpe and Koenig P.C.
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