Method and apparatus providing an advanced mimo receiver that includes a signal-plus-residual interference (SPRI) detector
First Claim
1. A method comprising:
- space-time equalizing N received signals to generate M output signals from which at least inter-symbol interference and inter-layer interference are suppressed;
despreading each of the M output signals for generating M soft symbol estimates; and
processing the M soft symbol estimates to derive M final symbol decisions that are made in consideration of modeled residual inter-layer interference present in the space-time equalized M output signals, where processing further comprises operating a signal-plus-residual interference (SPRI) detector that operates in accordance with a maximum likelihood (ML) technique.
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Accused Products
Abstract
A method is disclosed to obtain M final symbol decisions for signals received through N receive antennas that were transmitted in M parallel data layers, using a same spreading code from M transmit antennas. The method includes space-time equalizing the N received signals to generate M output signals from which at least inter-symbol interference is substantially removed and inter-layer interference is suppressed; despreading each of the M output signals for generating M soft symbol estimates; and processing the M soft symbol estimates to derive M final symbol decisions that are made in consideration of modeled residual inter-layer interference present in the space-time equalized M output signals. Processing includes operating a signal-plus-residual-interference (SPRI) detector that operates in accordance with a maximum likelihood (ML) technique, while space-time equalizing employs a linear minimum mean-square error (LMMSE) criterion. Transmitting may occur at a base station having the M transmit antennas, and receiving may occur at a mobile station having the N receive antennas.
19 Citations
22 Claims
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1. A method comprising:
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space-time equalizing N received signals to generate M output signals from which at least inter-symbol interference and inter-layer interference are suppressed; despreading each of the M output signals for generating M soft symbol estimates; and processing the M soft symbol estimates to derive M final symbol decisions that are made in consideration of modeled residual inter-layer interference present in the space-time equalized M output signals, where processing further comprises operating a signal-plus-residual interference (SPRI) detector that operates in accordance with a maximum likelihood (ML) technique. - View Dependent Claims (3, 4)
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2. (canceled)
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5. A system to obtain M final symbol decisions for signals received through N receive antennas that were transmitted in M parallel data layers, using a same spreading code from M transmit antennas, comprising:
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a space-time equalizer configured to operate on the N received signals to generate M output signals from which at least inter-symbol interference and interlayer interference are suppressed; a plurality of despreaders configured to despread each of the M output signals to generate M soft symbol estimates; and processing apparatus configured to process the M soft symbol estimates to derive M final symbol decisions that are made in consideration of modeled residual inter-layer interference present in the M output signals of said space-time equalizer, where said processing apparatus further comprises a signal-plus-residual-interference (SPRI) detector that operates in accordance with a maximum likelihood (ML) technique. - View Dependent Claims (7, 8)
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6. (canceled)
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9. A Multiple Input, Multiple Output (MIMO) RF receiver, configured to receive M symbols transmitted in M parallel data layers through N receive antennas, using a same spreading code, c(k), from M transmit antennas;
- a space-time equalizer having N inputs coupled to said N receive antennas and M outputs coupled to individual ones of M code correlators, the space-time equalizer configured to suppress at least inter-symbol interference and inter-layer interference;
a signal model generator having an input coupled to a channel estimator and an output for outputting at least a model of residual inter-layer interference; and
a signal-plus-residual-interference (SPRI) detector having M inputs coupled to outputs of said M code correlators configured to receive M soft symbol estimates there from, a further input coupled to said output of said signal model generator, and M outputs configured to output M final symbol decisions that are made taking into account the residual inter-layer interference that was not removed by said space-time equalizer. - View Dependent Claims (10, 11, 12, 13, 14)
- a space-time equalizer having N inputs coupled to said N receive antennas and M outputs coupled to individual ones of M code correlators, the space-time equalizer configured to suppress at least inter-symbol interference and inter-layer interference;
- 15. A received signal-plus-residual-interference (SPRI) detector comprising M inputs configured to be coupled to M sources of soft symbol estimates in which inter-symbol interference and inter-layer interference have been suppressed, a further input configured to be coupled to an output of a signal model generator that models residual inter-layer interference present in an equalized received signal, and M outputs configured to output M final symbol decisions that are made taking into account the residual inter-layer interference.
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18. A system to obtain M final symbol decisions for signals received through N receive antennas that were transmitted in M parallel data layers, using a same spreading code from M transmit antennas, comprising:
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an equalizer configured to operate on the N received signals to generate M output signals from which at least inter-symbol interference and inter-layer interference is are suppressed; a plurality of despreaders arranged to despread each of the M output signals for generating M soft symbol estimates; and processing apparatus configured to process the M soft symbol estimates to derive M final symbol decisions that are made in consideration of modeled residual inter-layer interference present in the M output signals of said equalizer. - View Dependent Claims (19, 20, 21, 22)
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Specification