Multiplex communications – Crosstalk suppression
Reexamination Certificate
2011-07-12
2011-07-12
Nguyen, Brian D (Department: 2472)
Multiplex communications
Crosstalk suppression
C379S417000
Reexamination Certificate
active
07978591
ABSTRACT:
Signals in a multi-channel, impaired communication system are post-processed at the receiver. A triangular matrix Decision Feedback Demodulator (DFD) at the receiver extracts channels without requiring delivery of receiver parameters to the transmitter. Multi-Input Multi-Output (MIMO) processing matrices and DFD parameters are computed by first applying matrix transformations to diagonalize the noise covariance matrix of the multiple channels received at the receiver. QR decompositions (i.e., decompositions into orthogonal and triangular matrices) are then applied to the main channels to obtain triangular channel matrices. The noise-diagonalizing transformations and QR decompositions are then combined to form the MIMO postprocessing matrices and DFD parameters. MIMO postprocessing matrices and DFD parameters are computed from training data and then adapted during live data transmission.
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Erickson Mark Alan
Gudmundsson Thorkell
Hench John Josef
Kanellakopoulos Ioannis
Nguyen Brian D
Tokyo Electron Limited
Wood Herron & Evans LLP
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