Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
2006-11-21
2006-11-21
Fan, Chieh M. (Department: 2634)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
C375S340000, C375S329000, C375S262000, C375S232000, C375S346000, C375S229000, C370S203000, C370S347000, C345S582000, C348S614000, C704S233000, C455S504000
Reexamination Certificate
active
07139336
ABSTRACT:
A method and system are directed to enabling a detector to perform relatively accurate channel estimates on blocks of data that include relatively short training sequences in wireless communication signals. Channel re-estimation is performed by transferring the estimation calculations from the time domain into a channel state domain. In one embodiment, information obtained from known training sequences and unknown data may be combined to generate an initial channel estimate. An embodiment of a new recursive Expectation Maximization (EM) process generally i) initializes the EM process with the initial channel estimate; ii) determines updates for the channel estimates; iii) produces a reduced observation vector; iv) generates a special sequence of channel states; v) rearranges each channel state estimate in the reduced observation vector; vi) generates a low-dimensional channel model matrix inversion based on the generated special sequence of channel states; and vii) generates channel estimates based on the generated matrix inversion.
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Branch John W.
Darby & Darby P.C.
Fan Chieh M.
Nokia Corporation
Pathak Sudhanshu C.
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